diff --git a/benchmarks/diffusion/quantization_quality.py b/benchmarks/diffusion/quantization_quality.py
index b47fae41f..ac0fe9d70 100644
--- a/benchmarks/diffusion/quantization_quality.py
+++ b/benchmarks/diffusion/quantization_quality.py
@@ -158,7 +158,6 @@ def _build_omni_kwargs(args, quantization=None):
 def _generate_image(omni, args, prompt, seed):
     """Generate a single image and return (PIL.Image, time_seconds, memory_gib)."""
     from vllm_omni.inputs.data import OmniDiffusionSamplingParams
-    from vllm_omni.outputs import OmniRequestOutput
     from vllm_omni.platforms import current_omni_platform
 
     generator = torch.Generator(device=current_omni_platform.device_type).manual_seed(seed)
@@ -176,7 +175,7 @@ def _generate_image(omni, args, prompt, seed):
     elapsed = time.perf_counter() - start
     peak_mem = torch.accelerator.max_memory_allocated() / (1024**3)
 
-    req_out = OmniRequestOutput.unwrap_result(outputs)
+    req_out = outputs[0] if isinstance(outputs, list) else outputs
     if not req_out.images:
         raise ValueError("Could not extract image output from result.")
     img = req_out.images[0]
@@ -206,15 +205,15 @@ def _generate_video(omni, args, prompt, seed):
     elapsed = time.perf_counter() - start
     peak_mem = torch.accelerator.max_memory_allocated() / (1024**3)
 
-    first = outputs[0]
-    if hasattr(first, "request_output") and isinstance(first.request_output, list):
-        inner = first.request_output[0]
-        if isinstance(inner, OmniRequestOutput) and hasattr(inner, "images"):
-            frames = inner.images[0] if inner.images else None
-        else:
-            frames = inner
-    elif hasattr(first, "images") and first.images:
-        frames = first.images[0]
+    if isinstance(outputs, list) and isinstance(outputs[0], OmniRequestOutput):
+        first = outputs[0]
+    elif isinstance(outputs, OmniRequestOutput):
+        first = outputs
+    else:
+        raise ValueError("Could not extract video frames from output.")
+
+    if hasattr(first, "images"):
+        frames = first.images[0] if first.images else None
     else:
         raise ValueError("Could not extract video frames from output.")
 
diff --git a/benchmarks/glm_image/vllm-omni/inference.py b/benchmarks/glm_image/vllm-omni/inference.py
index 5729da071..584ed5c63 100644
--- a/benchmarks/glm_image/vllm-omni/inference.py
+++ b/benchmarks/glm_image/vllm-omni/inference.py
@@ -300,7 +300,7 @@ def benchmark(args: argparse.Namespace) -> None:
         output_idx = 0
         for stage_outputs in omni.generate(all_prompts, sampling_params_list, py_generator=True):
             if stage_outputs.final_output_type == "image":
-                request_output = stage_outputs.request_output
+                request_output = stage_outputs
                 request_id = getattr(request_output, "request_id", "")
 
                 images = getattr(request_output, "images", [])
diff --git a/examples/offline_inference/aura_omni/end2end.py b/examples/offline_inference/aura_omni/end2end.py
index c08287515..bac385d8e 100644
--- a/examples/offline_inference/aura_omni/end2end.py
+++ b/examples/offline_inference/aura_omni/end2end.py
@@ -131,7 +131,7 @@ def build_sampling_params() -> list[SamplingParams]:
 
 
 def save_stage_output(stage_outputs, output_dir: str) -> None:
-    output = stage_outputs.request_output
+    output = stage_outputs
     request_id = output.request_id
     if stage_outputs.final_output_type == "text":
         text_output = output.outputs[0].text
diff --git a/examples/offline_inference/covo_audio/end2end.py b/examples/offline_inference/covo_audio/end2end.py
index ce728373d..5b7ac5fef 100644
--- a/examples/offline_inference/covo_audio/end2end.py
+++ b/examples/offline_inference/covo_audio/end2end.py
@@ -104,7 +104,7 @@ def main(args):
     os.makedirs(output_dir, exist_ok=True)
 
     for stage_outputs in omni_outputs:
-        output = stage_outputs.request_output
+        output = stage_outputs
         if stage_outputs.final_output_type == "text":
             request_id = output.request_id
             text_output = output.outputs[0].text
diff --git a/examples/offline_inference/custom_pipeline/image_to_image/image_edit.py b/examples/offline_inference/custom_pipeline/image_to_image/image_edit.py
index 7c91c0323..5f4311050 100644
--- a/examples/offline_inference/custom_pipeline/image_to_image/image_edit.py
+++ b/examples/offline_inference/custom_pipeline/image_to_image/image_edit.py
@@ -228,7 +228,7 @@ async def main():
     if not outputs:
         raise ValueError("No output produced from omni.generate()")
 
-    first_out = outputs[0].request_output
+    first_out = outputs[0]
     req_out: OmniRequestOutput = first_out
 
     # Verify trajectory data (from custom pipeline)
diff --git a/examples/offline_inference/dynin_omni/end2end.py b/examples/offline_inference/dynin_omni/end2end.py
index 3442bd9bc..0cab46fee 100644
--- a/examples/offline_inference/dynin_omni/end2end.py
+++ b/examples/offline_inference/dynin_omni/end2end.py
@@ -741,7 +741,7 @@ def make_mmu_prompt(
 
 def iter_mm_outputs(outputs: list[Any]):
     for omni_out in outputs:
-        req_out = getattr(omni_out, "request_output", None)
+        req_out = omni_out
         req_list = req_out if isinstance(req_out, list) else [req_out]
         for item in req_list:
             if item is None:
diff --git a/examples/offline_inference/hunyuan_image3/end2end.py b/examples/offline_inference/hunyuan_image3/end2end.py
index 62836f963..9a2350156 100644
--- a/examples/offline_inference/hunyuan_image3/end2end.py
+++ b/examples/offline_inference/hunyuan_image3/end2end.py
@@ -303,7 +303,7 @@ def main():
     )
     img_idx = 0
     for req_output in omni_outputs:
-        ro = getattr(req_output, "request_output", None)
+        ro = req_output
         stage_id = getattr(req_output, "stage_id", None)
 
         # AR stage text — each CompletionOutput.text is already a delta when
diff --git a/examples/offline_inference/image_to_image/image_edit.py b/examples/offline_inference/image_to_image/image_edit.py
index 10cf91088..ae84353f7 100644
--- a/examples/offline_inference/image_to_image/image_edit.py
+++ b/examples/offline_inference/image_to_image/image_edit.py
@@ -621,7 +621,7 @@ def main():
         images = getattr(output, "images", None)
         if images:
             break
-        req_out = getattr(output, "request_output", None)
+        req_out = output
         images = getattr(req_out, "images", None) if req_out is not None else None
         if images:
             break
diff --git a/examples/offline_inference/image_to_video/image_to_video.py b/examples/offline_inference/image_to_video/image_to_video.py
index c34e9101b..222502e8a 100644
--- a/examples/offline_inference/image_to_video/image_to_video.py
+++ b/examples/offline_inference/image_to_video/image_to_video.py
@@ -646,8 +646,8 @@ def main():
         if frames.multimodal_output and "audio" in frames.multimodal_output:
             audio = frames.multimodal_output["audio"]
             audio_sample_rate = frames.multimodal_output.get("audio_sample_rate", audio_sample_rate)
-        if frames.is_pipeline_output and frames.request_output is not None:
-            inner_output = frames.request_output
+        if frames.is_pipeline_output and frames is not None:
+            inner_output = frames
             if isinstance(inner_output, OmniRequestOutput):
                 if inner_output.multimodal_output and "audio" in inner_output.multimodal_output:
                     audio = inner_output.multimodal_output["audio"]
diff --git a/examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_image_summarize.py b/examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_image_summarize.py
new file mode 100644
index 000000000..5363948dd
--- /dev/null
+++ b/examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_image_summarize.py
@@ -0,0 +1,117 @@
+"""
+Offline inference example: MammothModa2 image summarization (single AR stage).
+
+Example:
+  uv run python examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_image_summarize.py \
+    --model path/to/MammothModa2-Preview \
+    --deploy-config vllm_omni/deploy/mammoth_moda2_ar.yaml \
+    --image /path/to/input.jpg \
+    --question "Please summarize the content of this image."
+"""
+
+from __future__ import annotations
+
+import argparse
+import os
+
+from PIL import Image
+from vllm import SamplingParams
+from vllm.multimodal.image import convert_image_mode
+
+from vllm_omni import Omni
+
+DEFAULT_SYSTEM = "You are a helpful assistant."
+DEFAULT_QUESTION = "Please summarize the content of this image."
+
+
+def parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(description="MammothModa2 image summarization (offline, AR only).")
+    parser.add_argument("--model", type=str, required=True, help="Path to model directory or model id.")
+    parser.add_argument("--deploy-config", type=str, required=True, help="Path to deploy config yaml.")
+    parser.add_argument("--image", type=str, required=True, help="Path to input image.")
+    parser.add_argument("--question", type=str, default=DEFAULT_QUESTION, help="Question/instruction for the model.")
+    parser.add_argument("--system", type=str, default=DEFAULT_SYSTEM, help="System prompt.")
+    parser.add_argument(
+        "--max-tokens",
+        type=int,
+        default=512,
+        help="Max new tokens to generate.",
+    )
+    parser.add_argument("--temperature", type=float, default=0.2)
+    parser.add_argument("--top-p", type=float, default=0.9)
+    parser.add_argument("--seed", type=int, default=42)
+    parser.add_argument("--trust-remote-code", action="store_true")
+    parser.add_argument(
+        "--enable-diffusion-pipeline-profiler",
+        action="store_true",
+        help="Enable diffusion pipeline profiler to display stage durations.",
+    )
+    return parser.parse_args()
+
+
+def build_prompt(system: str, question: str) -> str:
+    return (
+        f"<|im_start|>system\n{system}<|im_end|>\n"
+        "<|im_start|>user\n"
+        "<|vision_start|><|image_pad|><|vision_end|>"
+        f"{question}<|im_end|>\n"
+        "<|im_start|>assistant\n"
+    )
+
+
+def main() -> None:
+    args = parse_args()
+
+    if not os.path.exists(args.image):
+        raise FileNotFoundError(f"Image file not found: {args.image}")
+
+    pil_image = Image.open(args.image)
+    image_data = convert_image_mode(pil_image, "RGB")
+    prompt = build_prompt(args.system, args.question)
+
+    omni = Omni(
+        model=args.model,
+        deploy_config=args.deploy_config,
+        trust_remote_code=args.trust_remote_code,
+        enable_diffusion_pipeline_profiler=args.enable_diffusion_pipeline_profiler,
+    )
+    try:
+        sp = SamplingParams(
+            temperature=float(args.temperature),
+            top_p=float(args.top_p),
+            top_k=-1,
+            max_tokens=int(args.max_tokens),
+            seed=int(args.seed),
+            detokenize=True,
+        )
+        # NOTE: omni.generate() returns a Generator[OmniRequestOutput, None, None].
+        # Consume it inside the try block so the worker isn't closed early.
+        outputs = list(
+            omni.generate(
+                [
+                    {
+                        "prompt": prompt,
+                        "multi_modal_data": {"image": image_data},
+                        "additional_information": {"omni_task": ["chat"]},
+                    }
+                ],
+                [sp],
+            )
+        )
+    finally:
+        omni.close()
+
+    lines: list[str] = []
+    for stage_outputs in outputs:
+        ro = stage_outputs
+        text = ro.outputs[0].text if getattr(ro, "outputs", None) else str(ro)
+        lines.append(f"request_id: {getattr(ro, 'request_id', 'unknown')}\n")
+        lines.append("answer:\n")
+        lines.append(text.strip() + "\n")
+        lines.append("\n")
+
+    print("\n".join(lines))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/examples/offline_inference/mimo_audio/end2end.py b/examples/offline_inference/mimo_audio/end2end.py
index 4ba8f483a..e1772838a 100644
--- a/examples/offline_inference/mimo_audio/end2end.py
+++ b/examples/offline_inference/mimo_audio/end2end.py
@@ -297,7 +297,7 @@ def main(args):
     os.makedirs(output_dir, exist_ok=True)
 
     for stage_outputs in omni_outputs:
-        output = stage_outputs.request_output
+        output = stage_outputs
         if stage_outputs.final_output_type == "text":
             request_id = output.request_id
             text_output = output.outputs[0].text
diff --git a/examples/offline_inference/ming_flash_omni/end2end.py b/examples/offline_inference/ming_flash_omni/end2end.py
index 9fe907ae5..d41a8045b 100644
--- a/examples/offline_inference/ming_flash_omni/end2end.py
+++ b/examples/offline_inference/ming_flash_omni/end2end.py
@@ -347,7 +347,7 @@ def main(args):
         omni.start_profile(stages=args.profiler_stages)
 
     for stage_outputs in omni.generate(prompts, sampling_params_list):
-        output = stage_outputs.request_output
+        output = stage_outputs
         if stage_outputs.final_output_type == "text":
             request_id = output.request_id
             text_output = output.outputs[0].text
diff --git a/examples/offline_inference/qwen2_5_omni/end2end.py b/examples/offline_inference/qwen2_5_omni/end2end.py
index d8769b5f7..6dbafdfc1 100644
--- a/examples/offline_inference/qwen2_5_omni/end2end.py
+++ b/examples/offline_inference/qwen2_5_omni/end2end.py
@@ -392,7 +392,7 @@ def main(args):
     total_requests = len(prompts)
     processed_count = 0
     for stage_outputs in omni_generator:
-        output = stage_outputs.request_output
+        output = stage_outputs
         if stage_outputs.final_output_type == "text":
             request_id = output.request_id
             text_output = output.outputs[0].text
diff --git a/examples/offline_inference/qwen3_omni/end2end.py b/examples/offline_inference/qwen3_omni/end2end.py
index ae719e1c3..9434b3058 100644
--- a/examples/offline_inference/qwen3_omni/end2end.py
+++ b/examples/offline_inference/qwen3_omni/end2end.py
@@ -367,7 +367,7 @@ def main(args):
     print(f"query type: {args.query_type}")
 
     for stage_outputs in omni_generator:
-        output = stage_outputs.request_output
+        output = stage_outputs
         if stage_outputs.final_output_type == "text":
             request_id = output.request_id
             text_output = output.outputs[0].text
diff --git a/examples/offline_inference/qwen3_omni/end2end_async_chunk.py b/examples/offline_inference/qwen3_omni/end2end_async_chunk.py
index 7d051ac4a..c224586c4 100644
--- a/examples/offline_inference/qwen3_omni/end2end_async_chunk.py
+++ b/examples/offline_inference/qwen3_omni/end2end_async_chunk.py
@@ -237,7 +237,7 @@ async def run_single_request(
             sampling_params_list=sampling_params_list,
             output_modalities=output_modalities,
         ):
-            output = omni_output.request_output
+            output = omni_output
             if omni_output.final_output_type == "text":
                 if stage_0_first_output_ts is None:
                     stage_0_first_output_ts = time.perf_counter()
diff --git a/examples/offline_inference/speech_to_video/speech_to_video.py b/examples/offline_inference/speech_to_video/speech_to_video.py
index bfa6d961a..964cd4874 100644
--- a/examples/offline_inference/speech_to_video/speech_to_video.py
+++ b/examples/offline_inference/speech_to_video/speech_to_video.py
@@ -26,7 +26,6 @@ import torch
 from vllm_omni.diffusion.data import DiffusionParallelConfig
 from vllm_omni.entrypoints.omni import Omni
 from vllm_omni.inputs.data import OmniDiffusionSamplingParams
-from vllm_omni.outputs import OmniRequestOutput
 from vllm_omni.platforms import current_omni_platform
 
 
@@ -352,8 +351,8 @@ def main():
         else:
             print("[Profiler] No valid profiling data returned.")
 
-    # Extract output from result
-    output = OmniRequestOutput.unwrap_result(result)
+    # omni.generate() returns a list for sync calls; unwrap single-result list.
+    output = result[0] if isinstance(result, list) else result
 
     if not output.images:
         raise ValueError("No video frames found in OmniRequestOutput.")
diff --git a/examples/offline_inference/step_audio2/end2end.py b/examples/offline_inference/step_audio2/end2end.py
index e0d1836a8..f175db750 100644
--- a/examples/offline_inference/step_audio2/end2end.py
+++ b/examples/offline_inference/step_audio2/end2end.py
@@ -345,7 +345,7 @@ def main(args):
     # Process outputs from each stage
     for stage_idx, stage_outputs in enumerate(omni_outputs):
         # request_output may be a single object or a list
-        raw_output = stage_outputs.request_output
+        raw_output = stage_outputs
         outputs_list = raw_output if isinstance(raw_output, list) else [raw_output]
 
         if stage_outputs.final_output_type == "text":
diff --git a/examples/offline_inference/text_to_audio/text_to_audio.py b/examples/offline_inference/text_to_audio/text_to_audio.py
index 3ad88a6f3..eff9c9d1a 100644
--- a/examples/offline_inference/text_to_audio/text_to_audio.py
+++ b/examples/offline_inference/text_to_audio/text_to_audio.py
@@ -43,6 +43,7 @@ from vllm_omni.diffusion.utils.param_utils import apply_declared_extra_args
 from vllm_omni.entrypoints.omni import Omni
 from vllm_omni.inputs.data import OmniDiffusionSamplingParams
 from vllm_omni.model_extras import get_extra_body_params, get_model_class_name
+from vllm_omni.outputs import OmniRequestOutput
 from vllm_omni.platforms import current_omni_platform
 
 AUDIOX_TASKS = ("t2a", "t2m", "v2a", "v2m", "tv2a", "tv2m")
@@ -388,9 +389,9 @@ def main():
         raise ValueError("No output generated from omni.generate()")
 
     output = outputs[0]
-    if not hasattr(output, "request_output") or not output.request_output:
+    if not isinstance(output, OmniRequestOutput) or not output:
         raise ValueError("No request_output found in OmniRequestOutput")
-    request_output = output.request_output
+    request_output = output
     if not hasattr(request_output, "multimodal_output"):
         raise ValueError("No multimodal_output found in request_output")
 
diff --git a/examples/offline_inference/text_to_image/gradio_demo.py b/examples/offline_inference/text_to_image/gradio_demo.py
index 09e011240..bf60c3064 100644
--- a/examples/offline_inference/text_to_image/gradio_demo.py
+++ b/examples/offline_inference/text_to_image/gradio_demo.py
@@ -115,7 +115,7 @@ def build_demo(args: argparse.Namespace) -> gr.Blocks:
         )
         images_outputs = []
         for output in outputs:
-            req_out = output.request_output
+            req_out = output
             if not isinstance(req_out, OmniRequestOutput) or not hasattr(req_out, "images"):
                 raise ValueError("Invalid request_output structure or missing 'images' key")
             images = req_out.images
diff --git a/examples/offline_inference/text_to_image/text_to_image.py b/examples/offline_inference/text_to_image/text_to_image.py
index 2cadb49e6..360c726fd 100644
--- a/examples/offline_inference/text_to_image/text_to_image.py
+++ b/examples/offline_inference/text_to_image/text_to_image.py
@@ -656,7 +656,7 @@ def main():
         images = getattr(output, "images", None)
         if images:
             break
-        req_out = getattr(output, "request_output", None)
+        req_out = output
         images = getattr(req_out, "images", None) if req_out is not None else None
         if images:
             break
diff --git a/examples/offline_inference/text_to_speech/cosyvoice3/end2end.py b/examples/offline_inference/text_to_speech/cosyvoice3/end2end.py
index ccfb1aaef..62917de07 100644
--- a/examples/offline_inference/text_to_speech/cosyvoice3/end2end.py
+++ b/examples/offline_inference/text_to_speech/cosyvoice3/end2end.py
@@ -168,7 +168,7 @@ def run_e2e():
     print(f"Received {len(outputs)} outputs.")
     for i, output in enumerate(outputs):
         try:
-            ro = output.request_output
+            ro = output
             if ro is None:
                 print("No request_output found.")
                 continue
diff --git a/examples/offline_inference/text_to_speech/fish_speech/end2end.py b/examples/offline_inference/text_to_speech/fish_speech/end2end.py
index 5661cccd3..18b4d79f8 100644
--- a/examples/offline_inference/text_to_speech/fish_speech/end2end.py
+++ b/examples/offline_inference/text_to_speech/fish_speech/end2end.py
@@ -179,7 +179,7 @@ def main(args):
 
     t_start = time.perf_counter()
     for stage_outputs in omni.generate(inputs):
-        request_output = stage_outputs.request_output
+        request_output = stage_outputs
         if request_output is None or not request_output.outputs:
             continue
         _save_wav(
@@ -215,7 +215,7 @@ async def main_streaming(args):
     sample_rate = None
 
     async for stage_output in omni.generate(prompt, request_id=request_id):
-        mm = stage_output.request_output.outputs[0].multimodal_output
+        mm = stage_output.outputs[0].multimodal_output
         if not stage_output.finished:
             t_now = time.perf_counter()
             sample_rate, n = _collect_audio_chunk(mm, all_audio_chunks, sample_rate)
diff --git a/examples/offline_inference/text_to_speech/moss_tts_nano/end2end.py b/examples/offline_inference/text_to_speech/moss_tts_nano/end2end.py
index 91291743e..979770865 100644
--- a/examples/offline_inference/text_to_speech/moss_tts_nano/end2end.py
+++ b/examples/offline_inference/text_to_speech/moss_tts_nano/end2end.py
@@ -137,7 +137,7 @@ def main(args) -> None:
     params_list = sampling_params
 
     for stage_outputs in omni.generate(inputs, params_list):
-        for i, req_output in enumerate(stage_outputs.request_output):
+        for i, req_output in enumerate(stage_outputs):
             for j, out in enumerate(req_output.outputs):
                 mm = out.multimodal_output
                 if mm is None:
diff --git a/examples/offline_inference/text_to_speech/omnivoice/end2end.py b/examples/offline_inference/text_to_speech/omnivoice/end2end.py
index a6bdc7b4e..f1699d0b8 100644
--- a/examples/offline_inference/text_to_speech/omnivoice/end2end.py
+++ b/examples/offline_inference/text_to_speech/omnivoice/end2end.py
@@ -135,7 +135,7 @@ def run_e2e():
     print(f"Received {len(outputs)} outputs.")
     for i, output in enumerate(outputs):
         try:
-            ro = output.request_output
+            ro = output
             if ro is None:
                 print("No request_output found.")
                 continue
diff --git a/examples/offline_inference/text_to_speech/qwen3_tts/end2end.py b/examples/offline_inference/text_to_speech/qwen3_tts/end2end.py
index 8150338d5..7c0ce125e 100644
--- a/examples/offline_inference/text_to_speech/qwen3_tts/end2end.py
+++ b/examples/offline_inference/text_to_speech/qwen3_tts/end2end.py
@@ -391,7 +391,7 @@ def main(args):
     for batch_start in range(0, len(inputs), batch_size):
         batch = inputs[batch_start : batch_start + batch_size]
         for stage_outputs in omni.generate(batch):
-            output = stage_outputs.request_output
+            output = stage_outputs
             _save_wav(output_dir, output.request_id, output.outputs[0].multimodal_output)
 
 
@@ -412,7 +412,7 @@ async def main_streaming(args):
         t_prev = t_start
         chunk_idx = 0
         async for stage_output in omni.generate(prompt, request_id=request_id):
-            mm = stage_output.request_output.outputs[0].multimodal_output
+            mm = stage_output.outputs[0].multimodal_output
             if not stage_output.finished:
                 t_now = time.perf_counter()
                 audio = mm.get("audio")
diff --git a/examples/offline_inference/text_to_speech/qwen3_tts/word_timestamps.py b/examples/offline_inference/text_to_speech/qwen3_tts/word_timestamps.py
new file mode 100644
index 000000000..62f5e2caa
--- /dev/null
+++ b/examples/offline_inference/text_to_speech/qwen3_tts/word_timestamps.py
@@ -0,0 +1,172 @@
+"""Offline Qwen3-TTS example with word-level timestamps.
+
+This demo runs Qwen3-TTS offline, aligns the synthesized audio in memory with
+the same shared forced aligner used by the streaming server path, then writes
+the WAV and JSON sidecar:
+
+    python examples/offline_inference/text_to_speech/qwen3_tts/word_timestamps.py \
+        --model Qwen/Qwen3-TTS-12Hz-1.7B-CustomVoice \
+        --forced-aligner Qwen/Qwen3-ForcedAligner-0.6B
+
+On machines without a local CUDA toolkit, set ``VLLM_USE_FLASHINFER_SAMPLER=0``
+to avoid FlashInfer sampler JIT during warmup.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import json
+import os
+from pathlib import Path
+from typing import Any
+
+os.environ.setdefault("VLLM_WORKER_MULTIPROC_METHOD", "spawn")
+# The in-process offline aligner consumes token_classify outputs. Keeping V1
+# multiprocessing off avoids msgspec serialization issues for token-wise logits.
+os.environ.setdefault("VLLM_ENABLE_V1_MULTIPROCESSING", "0")
+
+import numpy as np
+import soundfile as sf
+import torch
+from end2end import _estimate_prompt_len
+from vllm.utils.argparse_utils import FlexibleArgumentParser
+
+from vllm_omni import Omni
+from vllm_omni.engine.arg_utils import nullify_stage_engine_defaults
+from vllm_omni.utils.forced_aligner import align, build_forced_aligner_config
+
+
+def _default_stage_config() -> str:
+    repo_root = Path(__file__).resolve().parents[4]
+    return str(repo_root / "vllm_omni" / "deploy" / "qwen3_tts.yaml")
+
+
+def _build_custom_voice_input(args: Any) -> dict[str, Any]:
+    additional_information = {
+        "task_type": ["CustomVoice"],
+        "text": [args.text],
+        "language": [args.language],
+        "speaker": [args.speaker],
+        "instruct": [args.instructions],
+        "max_new_tokens": [args.max_new_tokens],
+    }
+    return {
+        "prompt_token_ids": [0] * _estimate_prompt_len(additional_information, args.model),
+        "additional_information": additional_information,
+    }
+
+
+def _audio_tensor_and_sample_rate(mm: dict[str, Any]) -> tuple[torch.Tensor, int]:
+    audio_data = mm["audio"]
+    sr_raw = mm["sr"]
+    sr_val = sr_raw[-1] if isinstance(sr_raw, list) and sr_raw else sr_raw
+    sample_rate = int(sr_val.item()) if hasattr(sr_val, "item") else int(sr_val)
+    audio_tensor = torch.cat(audio_data, dim=-1) if isinstance(audio_data, list) else audio_data
+    return audio_tensor.float().detach().cpu().flatten(), sample_rate
+
+
+def _float_audio_to_pcm16_bytes(audio: torch.Tensor) -> bytes:
+    samples = audio.numpy()
+    pcm = (np.clip(samples, -1.0, 1.0) * 32767.0).astype("<i2")
+    return pcm.tobytes()
+
+
+async def _run_alignment(args: Any, audio: torch.Tensor, sample_rate: int) -> list[dict[str, Any]] | None:
+    aligner_config = build_forced_aligner_config(args)
+    if aligner_config is None:
+        raise ValueError("--forced-aligner or --forced-aligner-config is required")
+    timestamps = await align(
+        audio=_float_audio_to_pcm16_bytes(audio),
+        text=args.text,
+        sample_rate=sample_rate,
+        config=aligner_config,
+        language=args.language,
+    )
+    if timestamps is None:
+        return None
+    return [
+        {
+            "word": item.word,
+            "start_ms": item.start_ms,
+            "end_ms": item.end_ms,
+        }
+        for item in timestamps
+    ]
+
+
+def main(args: Any) -> None:
+    output_dir = Path(args.output_dir)
+    output_dir.mkdir(parents=True, exist_ok=True)
+
+    omni_kwargs = vars(args).copy()
+    for key in (
+        "forced_aligner",
+        "text",
+        "language",
+        "speaker",
+        "instructions",
+        "max_new_tokens",
+        "output_dir",
+    ):
+        omni_kwargs.pop(key, None)
+    omni_kwargs["stage_configs_path"] = args.stage_configs_path or _default_stage_config()
+    omni_kwargs["log_stats"] = args.log_stats
+    omni = Omni(**omni_kwargs)
+
+    prompt = _build_custom_voice_input(args)
+    final_output = None
+    for stage_outputs in omni.generate([prompt]):
+        final_output = stage_outputs
+    if final_output is None:
+        raise RuntimeError("Qwen3-TTS did not produce an output.")
+
+    mm = final_output.outputs[0].multimodal_output
+    audio, sample_rate = _audio_tensor_and_sample_rate(mm)
+
+    wav_path = output_dir / "qwen3_tts_word_timestamps.wav"
+    # Align the in-memory tensor, not the saved WAV. The WAV is only a demo
+    # artifact so users can listen to the same audio referenced by the sidecar.
+    timestamps = asyncio.run(_run_alignment(args, audio, sample_rate))
+    sf.write(wav_path, audio.numpy(), samplerate=sample_rate, format="WAV")
+
+    sidecar = {
+        "text": args.text,
+        "sample_rate": sample_rate,
+        "audio_path": str(wav_path),
+        "timestamps": timestamps,
+    }
+    json_path = output_dir / "qwen3_tts_word_timestamps.json"
+    json_path.write_text(json.dumps(sidecar, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")
+
+    print(f"Saved audio: {wav_path}")
+    print(f"Saved timestamps: {json_path}")
+    print(json.dumps(sidecar["timestamps"], ensure_ascii=False, indent=2))
+
+
+def parse_args() -> Any:
+    parser = FlexibleArgumentParser(description="Offline Qwen3-TTS word timestamp example")
+    parser.add_argument("--model", default="Qwen/Qwen3-TTS-12Hz-1.7B-CustomVoice", help="Qwen3-TTS model path/name")
+    parser.add_argument(
+        "--forced-aligner",
+        default=None,
+        help="Qwen3 forced aligner model path/name",
+    )
+    parser.add_argument(
+        "--forced-aligner-config",
+        default=None,
+        help="Optional YAML file for forced aligner settings (incl. gpu_memory_utilization)",
+    )
+    parser.add_argument("--stage-configs-path", default=None, help="Qwen3-TTS deploy YAML")
+    parser.add_argument("--text", default="Hello world.", help="Text to synthesize and align")
+    parser.add_argument("--language", default="English", help="Qwen3-TTS language field")
+    parser.add_argument("--speaker", default="Vivian", help="CustomVoice speaker name")
+    parser.add_argument("--instructions", default="", help="Optional speaking style instruction")
+    parser.add_argument("--max-new-tokens", type=int, default=2048, help="TTS max_new_tokens")
+    parser.add_argument("--output-dir", default="output_audio", help="Directory for WAV and JSON sidecar")
+    parser.add_argument("--log-stats", action="store_true", default=False, help="Enable vLLM-Omni stats logging")
+    nullify_stage_engine_defaults(parser)
+    return parser.parse_args()
+
+
+if __name__ == "__main__":
+    main(parse_args())
diff --git a/examples/offline_inference/text_to_speech/soulxsinger/benchmark.py b/examples/offline_inference/text_to_speech/soulxsinger/benchmark.py
index 97ed7eb97..14dd5e145 100644
--- a/examples/offline_inference/text_to_speech/soulxsinger/benchmark.py
+++ b/examples/offline_inference/text_to_speech/soulxsinger/benchmark.py
@@ -38,7 +38,7 @@ def _stage_durations_from_output(outputs) -> dict[str, float]:
     durations = getattr(omni_out, "stage_durations", None) or {}
     if durations:
         return dict(durations)
-    ro = getattr(omni_out, "request_output", None)
+    ro = omni_out
     if ro is not None:
         return dict(getattr(ro, "stage_durations", None) or {})
     return {}
diff --git a/examples/offline_inference/text_to_speech/soulxsinger/end2end.py b/examples/offline_inference/text_to_speech/soulxsinger/end2end.py
index 116b8da4b..a1bb112af 100644
--- a/examples/offline_inference/text_to_speech/soulxsinger/end2end.py
+++ b/examples/offline_inference/text_to_speech/soulxsinger/end2end.py
@@ -99,7 +99,7 @@ def extract_audio(outputs) -> tuple[np.ndarray, int]:
     out = outputs[0]
     mm = getattr(out, "multimodal_output", None)
     if mm is None:
-        ro = getattr(out, "request_output", None)
+        ro = out
         if ro is not None:
             mm = getattr(ro, "multimodal_output", None)
             if mm is None and ro.outputs:
diff --git a/examples/offline_inference/text_to_video/text_to_video.py b/examples/offline_inference/text_to_video/text_to_video.py
index 383887f5a..2e272b7a7 100644
--- a/examples/offline_inference/text_to_video/text_to_video.py
+++ b/examples/offline_inference/text_to_video/text_to_video.py
@@ -390,7 +390,7 @@ def _extract_peak_memory_mb(result: Any) -> float:
         return 0.0
     val = getattr(result, "peak_memory_mb", 0.0)
     if not val:
-        inner = getattr(result, "request_output", None)
+        inner = result
         if isinstance(inner, list):
             inner = inner[0] if inner else None
         val = getattr(inner, "peak_memory_mb", 0.0)
@@ -575,8 +575,8 @@ def main():
         if frames.multimodal_output and "audio" in frames.multimodal_output:
             audio = frames.multimodal_output["audio"]
             audio_sample_rate = frames.multimodal_output.get("audio_sample_rate", audio_sample_rate)
-        if frames.is_pipeline_output and frames.request_output is not None:
-            inner_output = frames.request_output
+        if frames.is_pipeline_output and frames is not None:
+            inner_output = frames
             if isinstance(inner_output, OmniRequestOutput):
                 if inner_output.multimodal_output and "audio" in inner_output.multimodal_output:
                     audio = inner_output.multimodal_output["audio"]
diff --git a/examples/offline_inference/x_to_video_audio/x_to_video_audio.py b/examples/offline_inference/x_to_video_audio/x_to_video_audio.py
index 0efbdc37d..9512ac65c 100644
--- a/examples/offline_inference/x_to_video_audio/x_to_video_audio.py
+++ b/examples/offline_inference/x_to_video_audio/x_to_video_audio.py
@@ -138,7 +138,7 @@ def _extract_peak_memory_mb(result: Any) -> float:
         return 0.0
     val = getattr(result, "peak_memory_mb", 0.0)
     if not val:
-        inner = getattr(result, "request_output", None)
+        inner = result
         if isinstance(inner, list):
             inner = inner[0] if inner else None
         val = getattr(inner, "peak_memory_mb", 0.0)
diff --git a/tests/diffusion/batching/test_diffusion_batching.py b/tests/diffusion/batching/test_diffusion_batching.py
index fa96b54a4..60136ce4d 100644
--- a/tests/diffusion/batching/test_diffusion_batching.py
+++ b/tests/diffusion/batching/test_diffusion_batching.py
@@ -125,7 +125,7 @@ def _extract_images(output: OmniRequestOutput) -> list:
         return output.images
     # When the output comes from the orchestrator pipeline, images may be
     # nested inside request_output.
-    inner = getattr(output, "request_output", None)
+    inner = output
     if inner is not None and hasattr(inner, "images") and inner.images:
         return inner.images
     return []
diff --git a/tests/diffusion/cache/test_teacache.py b/tests/diffusion/cache/test_teacache.py
index 8152792fc..62e0d6698 100644
--- a/tests/diffusion/cache/test_teacache.py
+++ b/tests/diffusion/cache/test_teacache.py
@@ -56,10 +56,10 @@ def test_teacache(model_name: str):
         # Extract images from request_output['images']
         first_output = outputs[0]
         assert first_output.final_output_type == "image"
-        if not hasattr(first_output, "request_output") or not first_output.request_output:
+        if not isinstance(first_output, OmniRequestOutput) or not first_output:
             raise ValueError("No request_output found in OmniRequestOutput")
 
-        req_out = first_output.request_output
+        req_out = first_output
         if not isinstance(req_out, OmniRequestOutput) or not hasattr(req_out, "images"):
             raise ValueError("Invalid request_output structure or missing 'images' key")
 
diff --git a/tests/diffusion/distributed/test_sequence_parallel.py b/tests/diffusion/distributed/test_sequence_parallel.py
index c02667b93..d43d18c49 100644
--- a/tests/diffusion/distributed/test_sequence_parallel.py
+++ b/tests/diffusion/distributed/test_sequence_parallel.py
@@ -131,7 +131,7 @@ def _run_inference(
             elapsed_ms = (time.time() - start) * 1000
 
             return InferenceResult(
-                images=outputs[0].request_output.images,
+                images=outputs[0].images,
                 elapsed_ms=elapsed_ms,
             )
     finally:
diff --git a/tests/diffusion/distributed/test_tensor_parallel.py b/tests/diffusion/distributed/test_tensor_parallel.py
index 9f39112ae..c50c4336d 100644
--- a/tests/diffusion/distributed/test_tensor_parallel.py
+++ b/tests/diffusion/distributed/test_tensor_parallel.py
@@ -49,10 +49,10 @@ def _diff_metrics(a: Image.Image, b: Image.Image) -> tuple[float, float]:
 def _extract_single_image(outputs) -> Image.Image:
     first_output = outputs[0]
     assert first_output.final_output_type == "image"
-    if not hasattr(first_output, "request_output") or not first_output.request_output:
+    if not isinstance(first_output, OmniRequestOutput) or not first_output:
         raise ValueError("No request_output found in OmniRequestOutput")
 
-    req_out = first_output.request_output
+    req_out = first_output
     if not isinstance(req_out, OmniRequestOutput) or not hasattr(req_out, "images"):
         raise ValueError("Invalid request_output structure or missing 'images' key")
 
diff --git a/tests/diffusion/lora/test_diffusion_lora.py b/tests/diffusion/lora/test_diffusion_lora.py
index 75e122a04..40a79a5e2 100644
--- a/tests/diffusion/lora/test_diffusion_lora.py
+++ b/tests/diffusion/lora/test_diffusion_lora.py
@@ -29,10 +29,10 @@ def test_diffusion_model(tmp_path: Path, omni_runner):
             raise ValueError("Empty outputs from Omni.generate()")
         first_output = outputs[0]
         assert first_output.final_output_type == "image"
-        if not hasattr(first_output, "request_output") or not first_output.request_output:
+        if not isinstance(first_output, OmniRequestOutput) or not first_output:
             raise ValueError("No request_output found in OmniRequestOutput")
 
-        req_out = first_output.request_output
+        req_out = first_output
         if not isinstance(req_out, OmniRequestOutput) or not hasattr(req_out, "images"):
             raise ValueError("Invalid request_output structure or missing 'images' key")
         return req_out.images
diff --git a/tests/diffusion/offloader/test_diffusion_cpu_offload.py b/tests/diffusion/offloader/test_diffusion_cpu_offload.py
index 549a98142..810f0dd52 100644
--- a/tests/diffusion/offloader/test_diffusion_cpu_offload.py
+++ b/tests/diffusion/offloader/test_diffusion_cpu_offload.py
@@ -122,8 +122,8 @@ def test_cpu_offload_diffusion_model(model_name: str):
     print(f"No offload peak memory: {no_offload_peak_memory} MB")
 
     if model_name == "stabilityai/stable-audio-open-1.0":
-        audio_offload = output_offload[0].request_output.multimodal_output.get("audio")
-        audio_no_offload = output_no_offload[0].request_output.multimodal_output.get("audio")
+        audio_offload = output_offload[0].multimodal_output.get("audio")
+        audio_no_offload = output_no_offload[0].multimodal_output.get("audio")
         check_audio_determinism(audio_offload, audio_no_offload, atol=1e-2)
 
     # Set platform-specific VRAM saving thresholds to account
diff --git a/tests/diffusion/offloader/test_diffusion_layerwise_offload.py b/tests/diffusion/offloader/test_diffusion_layerwise_offload.py
index 342c9833b..26944b202 100644
--- a/tests/diffusion/offloader/test_diffusion_layerwise_offload.py
+++ b/tests/diffusion/offloader/test_diffusion_layerwise_offload.py
@@ -20,18 +20,10 @@ IMAGE_VIDEO_MODELS = {
 
 MODELS = {**AUDIO_MODEL, **IMAGE_VIDEO_MODELS}
 
-LAYERWISE_MODEL_CASES = [
-    pytest.param(
-        "stabilityai/stable-audio-open-1.0",
-        marks=[pytest.mark.full_model, pytest.mark.diffusion],
-        id="stable_audio",
-    ),
-    pytest.param(
-        "riverclouds/qwen_image_random",
-        marks=[pytest.mark.core_model, pytest.mark.diffusion],
-        id="qwen_image_random",
-    ),
-]
+MODEL_MARKS = {
+    "riverclouds/qwen_image_random": pytest.mark.core_model,
+    "stabilityai/stable-audio-open-1.0": pytest.mark.full_model,
+}
 
 AUDIO_MODEL_PARAMS = {
     "runner_params": {},
@@ -101,8 +93,9 @@ def run_inference(
     return peak, output
 
 
+@pytest.mark.diffusion
 @hardware_test(res={"cuda": "L4", "rocm": "MI325"})
-@pytest.mark.parametrize("model_name", LAYERWISE_MODEL_CASES)
+@pytest.mark.parametrize("model_name", list(MODELS.keys()))
 def test_layerwise_offload_diffusion_model(model_name: str):
     """Test that layerwise offloading reduces GPU memory usage.
 
@@ -134,8 +127,8 @@ def test_layerwise_offload_diffusion_model(model_name: str):
     print(f"No offload peak memory: {no_offload_peak_memory} MB")
 
     if model_name == "stabilityai/stable-audio-open-1.0":
-        audio_offload = output_offload[0].request_output.multimodal_output.get("audio")
-        audio_no_offload = output_no_offload[0].request_output.multimodal_output.get("audio")
+        audio_offload = output_offload[0].multimodal_output.get("audio")
+        audio_no_offload = output_no_offload[0].multimodal_output.get("audio")
         # Match the sibling cpu-offload test's tolerance: layerwise offload moves
         # blocks across the PCIe bus on a side stream, which can perturb cuBLAS
         # algorithm selection and produce ~ULP-level drift larger than 1e-3.
diff --git a/tests/diffusion/quantization/test_gguf_diffusion.py b/tests/diffusion/quantization/test_gguf_diffusion.py
index fa87e8a7c..243282b0c 100644
--- a/tests/diffusion/quantization/test_gguf_diffusion.py
+++ b/tests/diffusion/quantization/test_gguf_diffusion.py
@@ -94,8 +94,8 @@ def _generate_single_stage_image(
     if hasattr(first_output, "images") and first_output.images:
         images = first_output.images
     else:
-        assert hasattr(first_output, "request_output") and first_output.request_output
-        request_output = first_output.request_output
+        assert isinstance(first_output, OmniRequestOutput) and first_output
+        request_output = first_output
         if isinstance(request_output, list):
             req_out = request_output[0]
         else:
diff --git a/tests/diffusion/quantization/test_quantization_fp8.py b/tests/diffusion/quantization/test_quantization_fp8.py
index 58f91742d..581a7498f 100644
--- a/tests/diffusion/quantization/test_quantization_fp8.py
+++ b/tests/diffusion/quantization/test_quantization_fp8.py
@@ -88,8 +88,8 @@ def _generate_single_stage_image(
         if hasattr(first_output, "images") and first_output.images:
             images = first_output.images
         else:
-            assert hasattr(first_output, "request_output") and first_output.request_output
-            request_output = first_output.request_output
+            assert isinstance(first_output, OmniRequestOutput) and first_output
+            request_output = first_output
             if isinstance(request_output, list):
                 req_out = request_output[0]
             else:
@@ -147,10 +147,10 @@ def _generate_single_stage_video(
 
         first = outputs[0]
 
-        # Unwrap pipeline-style outputs (multi-stage / OmniRequestOutput.request_output).
+        # Unwrap pipeline-style outputs (multi-stage / OmniRequestOutput).
         frames: Any = None
-        if hasattr(first, "request_output") and isinstance(first.request_output, list):
-            inner = first.request_output[0]
+        if isinstance(first, OmniRequestOutput) and isinstance(first, list):
+            inner = first[0]
             if isinstance(inner, OmniRequestOutput) and inner.images:
                 frames = inner.images[0]
         if frames is None and hasattr(first, "images") and first.images:
@@ -234,8 +234,8 @@ def _generate_bagel_image(
             if images := getattr(req_output, "images", None):
                 generated_image = images[0]
                 break
-            if hasattr(req_output, "request_output") and req_output.request_output:
-                stage_outputs = req_output.request_output
+            if isinstance(req_output, OmniRequestOutput) and req_output:
+                stage_outputs = req_output
                 if not isinstance(stage_outputs, list):
                     stage_outputs = [stage_outputs]
                 for stage_out in stage_outputs:
@@ -250,8 +250,8 @@ def _generate_bagel_image(
 
         # Check LLM stage output — should have finish_reason=stop (not length)
         for req_output in omni_outputs:
-            if hasattr(req_output, "request_output") and req_output.request_output:
-                stage_outputs = req_output.request_output
+            if isinstance(req_output, OmniRequestOutput) and req_output:
+                stage_outputs = req_output
                 if not isinstance(stage_outputs, list):
                     stage_outputs = [stage_outputs]
                 for stage_out in stage_outputs:
diff --git a/tests/diffusion/quantization/test_quantization_quality.py b/tests/diffusion/quantization/test_quantization_quality.py
index b704bca1d..fdcef37b5 100644
--- a/tests/diffusion/quantization/test_quantization_quality.py
+++ b/tests/diffusion/quantization/test_quantization_quality.py
@@ -310,7 +310,7 @@ def _generate_image(omni, config: QualityTestConfig):
     first = outputs[0]
     if hasattr(first, "images") and first.images:
         return first.images[0], peak_mem
-    inner = first.request_output
+    inner = first
     if inner is not None and hasattr(inner, "images") and inner.images:
         return inner.images[0], peak_mem
     raise ValueError("Could not extract image from output.")
@@ -341,15 +341,15 @@ def _generate_video(omni, config: QualityTestConfig):
     )
 
     peak_mem = torch.accelerator.max_memory_allocated() / (1024**3)
-    first = outputs[0]
-    if hasattr(first, "request_output") and isinstance(first.request_output, list):
-        inner = first.request_output[0]
-        if isinstance(inner, OmniRequestOutput) and hasattr(inner, "images"):
-            frames = inner.images[0] if inner.images else None
-        else:
-            frames = inner
-    elif hasattr(first, "images") and first.images:
-        frames = first.images[0]
+    if isinstance(outputs, list) and isinstance(outputs[0], OmniRequestOutput):
+        first = outputs[0]
+    elif isinstance(outputs, OmniRequestOutput):
+        first = outputs
+    else:
+        raise ValueError("Could not extract video frames from output.")
+
+    if hasattr(first, "images"):
+        frames = first.images[0] if first.images else None
     else:
         raise ValueError("Could not extract video frames from output.")
 
@@ -444,11 +444,11 @@ def test_benchmark_generate_image_unwraps_nested_omni_request_output(monkeypatch
 
     image = Image.new("RGB", (2, 2))
     inner = OmniRequestOutput.from_diffusion(request_id="req", images=[image])
-    outer = OmniRequestOutput(
+    outer = OmniRequestOutput.from_stage_output(
+        inner,
         request_id="req",
         stage_id=0,
         final_output_type="image",
-        request_output=inner,
         finished=True,
     )
 
diff --git a/tests/diffusion/quantization/test_trajectory_similarity_tool.py b/tests/diffusion/quantization/test_trajectory_similarity_tool.py
index 963ed5685..1561764fa 100644
--- a/tests/diffusion/quantization/test_trajectory_similarity_tool.py
+++ b/tests/diffusion/quantization/test_trajectory_similarity_tool.py
@@ -73,11 +73,9 @@ def test_run_summary_reports_worker_peak_memory():
     assert summary["per_run_peak_memory_mb"] == [100.0, 150.0]
 
 
-def test_request_peak_memory_prefers_inner_diffusion_output():
-    inner = type("InnerOutput", (), {"peak_memory_mb": 321.0})()
-    outer = type("OuterOutput", (), {"request_output": inner, "peak_memory_mb": 123.0})()
-
-    assert _request_peak_memory_mb(outer) == 321.0
+def test_request_peak_memory_reads_peak_memory_mb_directly():
+    result = type("Output", (), {"peak_memory_mb": 123.0})()
+    assert _request_peak_memory_mb(result) == 123.0
 
 
 def test_metric_guidance_describes_thresholds():
diff --git a/tests/diffusion/test_diffusion_streaming_output.py b/tests/diffusion/test_diffusion_streaming_output.py
index 824902ad4..d84f49b31 100644
--- a/tests/diffusion/test_diffusion_streaming_output.py
+++ b/tests/diffusion/test_diffusion_streaming_output.py
@@ -273,7 +273,7 @@ class TestPipelineStreamingOutputToEntrypoint:
             await _wait_for(lambda: len(pipeline.requests) == 1)
             assert pipeline.requests[0].request_id.startswith("req-omni-")
             assert [output.multimodal_output["metadata"]["stream"]["chunk"] for output in outputs] == [0, 1]
-            assert [getattr(output.request_output, "finished", output.finished) for output in outputs] == [False, True]
+            assert [output.finished for output in outputs] == [False, True]
         finally:
             await self._shutdown_pipeline_omni_harness(omni, fixture, inline_client)
 
diff --git a/tests/distributed/omni_connectors/test_bagel_mooncake_connector.py b/tests/distributed/omni_connectors/test_bagel_mooncake_connector.py
index fef63f4f8..57997905c 100644
--- a/tests/distributed/omni_connectors/test_bagel_mooncake_connector.py
+++ b/tests/distributed/omni_connectors/test_bagel_mooncake_connector.py
@@ -25,6 +25,7 @@ from tests.helpers.mark import hardware_test
 from tests.helpers.runtime import OmniRunner
 from tests.helpers.stage_config import get_deploy_config_path, modify_stage_config
 from vllm_omni.entrypoints.omni import Omni
+from vllm_omni.outputs import OmniRequestOutput
 
 pytestmark = [pytest.mark.usefixtures("clean_gpu_memory_between_tests")]
 
@@ -95,8 +96,8 @@ def _extract_generated_image(omni_outputs: list) -> Image.Image | None:
     for req_output in omni_outputs:
         if images := getattr(req_output, "images", None):
             return images[0]
-        if hasattr(req_output, "request_output") and req_output.request_output:
-            stage_out = req_output.request_output
+        if isinstance(req_output, OmniRequestOutput) and req_output:
+            stage_out = req_output
             if hasattr(stage_out, "images") and stage_out.images:
                 return stage_out.images[0]
     return None
diff --git a/tests/distributed/omni_connectors/test_bagel_shared_memory_connector.py b/tests/distributed/omni_connectors/test_bagel_shared_memory_connector.py
index 0545e9e3f..b97161335 100644
--- a/tests/distributed/omni_connectors/test_bagel_shared_memory_connector.py
+++ b/tests/distributed/omni_connectors/test_bagel_shared_memory_connector.py
@@ -24,6 +24,7 @@ from tests.helpers.mark import hardware_test
 from tests.helpers.runtime import OmniRunner
 from tests.helpers.stage_config import get_deploy_config_path, modify_stage_config
 from vllm_omni.entrypoints.omni import Omni
+from vllm_omni.outputs import OmniRequestOutput
 
 pytestmark = [pytest.mark.usefixtures("clean_gpu_memory_between_tests")]
 
@@ -122,8 +123,8 @@ def _extract_generated_image(omni_outputs: list) -> Image.Image | None:
     for req_output in omni_outputs:
         if images := getattr(req_output, "images", None):
             return images[0]
-        if hasattr(req_output, "request_output") and req_output.request_output:
-            stage_out = req_output.request_output
+        if isinstance(req_output, OmniRequestOutput) and req_output:
+            stage_out = req_output
             if hasattr(stage_out, "images") and stage_out.images:
                 return stage_out.images[0]
     return None
diff --git a/tests/e2e/accuracy/test_hunyuan_image3.py b/tests/e2e/accuracy/test_hunyuan_image3.py
index f28ac16b9..eed0ef6e8 100644
--- a/tests/e2e/accuracy/test_hunyuan_image3.py
+++ b/tests/e2e/accuracy/test_hunyuan_image3.py
@@ -328,7 +328,7 @@ def _run_offline(deploy_config_path: str, output_path: Path) -> tuple[Image.Imag
     images = None
     cot_text = ""
     for out in outputs:
-        ro = getattr(out, "request_output", None)
+        ro = out
         if ro and getattr(ro, "outputs", None):
             cot_text = "".join(getattr(o, "text", "") or "" for o in ro.outputs)
         if not cot_text:
@@ -467,7 +467,7 @@ def _extract_image(outputs) -> Image.Image:
     assert outputs, "Pipeline produced no outputs"
     for output in outputs:
         images = getattr(output, "images", None)
-        request_output = getattr(output, "request_output", None)
+        request_output = output
         if not images and request_output is not None:
             images = getattr(request_output, "images", None)
         if images:
diff --git a/tests/e2e/accuracy/test_videogen_modelopt_quant.py b/tests/e2e/accuracy/test_videogen_modelopt_quant.py
index e91c15175..3faa6737d 100644
--- a/tests/e2e/accuracy/test_videogen_modelopt_quant.py
+++ b/tests/e2e/accuracy/test_videogen_modelopt_quant.py
@@ -141,8 +141,8 @@ def _extract_frames(result) -> list[Image.Image]:
 
     if isinstance(result, list):
         result = result[0] if result else None
-    if isinstance(result, OmniRequestOutput) and result.is_pipeline_output and result.request_output is not None:
-        result = result.request_output
+    if isinstance(result, OmniRequestOutput) and result.is_pipeline_output and result is not None:
+        result = result
     images = getattr(result, "images", None)
     if not images:
         raise AssertionError("Pipeline output had no images")
diff --git a/tests/e2e/features/comfyui/test_comfyui_integration.py b/tests/e2e/features/comfyui/test_comfyui_integration.py
index e8d68b159..5dcb9c449 100644
--- a/tests/e2e/features/comfyui/test_comfyui_integration.py
+++ b/tests/e2e/features/comfyui/test_comfyui_integration.py
@@ -171,11 +171,11 @@ def _build_text_output(text: str = "This is a test response.") -> OmniRequestOut
         metrics=None,
         lora_request=None,
     )
-    return OmniRequestOutput(
+    return OmniRequestOutput.from_stage_output(
+        request_output,
         request_id="test_req_text",
         finished=True,
         final_output_type="text",
-        request_output=request_output,
     )
 
 
@@ -200,11 +200,11 @@ def _build_audio_chat_output(num_samples: int = 24000) -> OmniRequestOutput:
         metrics=None,
         lora_request=None,
     )
-    return OmniRequestOutput(
+    return OmniRequestOutput.from_stage_output(
+        request_output,
         request_id="test_req_audio_chat",
         finished=True,
         final_output_type="audio",
-        request_output=request_output,
     )
 
 
@@ -240,11 +240,11 @@ def _build_diffusion_image_output_for_chat_endpoint() -> OmniRequestOutput:
         images=[_build_image_output(color="blue")],
         finished=True,
     )
-    return OmniRequestOutput(
+    return OmniRequestOutput.from_stage_output(
+        request_output,
         request_id="test_req_img_chat",
-        finished=True,
+        images=[_build_image_output(color="blue")],
         final_output_type="image",
-        request_output=request_output,
     )
 
 
@@ -515,8 +515,19 @@ def mock_async_omni(
 
 
 @pytest.fixture
-def api_server(unused_tcp_port_factory, server_case: ServerCase, mock_async_omni):
+def api_server(unused_tcp_port_factory, server_case: ServerCase, mock_async_omni, tmp_path):
     """Set up a API server in background process from command line with parametrized model name and mocked AsyncOmni."""
+    # Override the STORAGE_MANAGER path to a writable temp directory before
+    # forking the server subprocess.  The default /tmp/storage may be owned
+    # by a different user (e.g. from a previous CI run) and cause
+    # PermissionError when the server tries to save generated video files.
+    from vllm_omni.entrypoints.openai.storage import STORAGE_MANAGER
+
+    old_storage_path = STORAGE_MANAGER.storage_path
+    new_storage_path = tmp_path / "omni_storage"
+    new_storage_path.mkdir(exist_ok=True)
+    STORAGE_MANAGER.storage_path = str(new_storage_path)
+
     parser = TrackingArgumentParser()
     subparsers = parser.add_subparsers(dest="command")
     cmd = OmniServeCommand()
@@ -555,6 +566,9 @@ def api_server(unused_tcp_port_factory, server_case: ServerCase, mock_async_omni
 
     yield f"http://127.0.0.1:{port}/v1"
 
+    # Restore the original storage path after the test.
+    STORAGE_MANAGER.storage_path = old_storage_path
+
     if server_process.is_alive():
         server_process.terminate()
     server_process.join(timeout=10)
diff --git a/tests/e2e/features/helpers/verl_omni_server.py b/tests/e2e/features/helpers/verl_omni_server.py
index d53e0936f..a38a3a12e 100644
--- a/tests/e2e/features/helpers/verl_omni_server.py
+++ b/tests/e2e/features/helpers/verl_omni_server.py
@@ -294,7 +294,7 @@ class vLLMOmniHttpServerLocal:
             "global_steps": self.global_steps,
         }
 
-        req_output = final_res.request_output
+        req_output = final_res
         if req_output is not None and hasattr(req_output, "finish_reason"):
             finish_reason = req_output.finish_reason or "stop"
         else:
diff --git a/tests/e2e/offline_inference/test_audiox_model_expansion.py b/tests/e2e/offline_inference/test_audiox_model_expansion.py
index d4b2f5223..af944b144 100644
--- a/tests/e2e/offline_inference/test_audiox_model_expansion.py
+++ b/tests/e2e/offline_inference/test_audiox_model_expansion.py
@@ -53,9 +53,9 @@ def test_audiox_model(omni_runner: OmniRunner) -> None:
     assert outputs is not None
     first_output = outputs[0]
     assert first_output.final_output_type == "audio"
-    assert hasattr(first_output, "request_output") and first_output.request_output
+    assert isinstance(first_output, OmniRequestOutput) and first_output
 
-    req_out = first_output.request_output
+    req_out = first_output
     assert isinstance(req_out, OmniRequestOutput)
     assert req_out.final_output_type == "audio"
     assert hasattr(req_out, "multimodal_output") and req_out.multimodal_output
diff --git a/tests/e2e/offline_inference/test_bagel.py b/tests/e2e/offline_inference/test_bagel.py
index 6d495a156..9ba7bdac4 100644
--- a/tests/e2e/offline_inference/test_bagel.py
+++ b/tests/e2e/offline_inference/test_bagel.py
@@ -55,7 +55,7 @@ pytestmark = [
 def _extract_text(omni_outputs: list) -> str:
     """Extract generated text from OmniRequestOutput list."""
     for req_output in omni_outputs:
-        ro = getattr(req_output, "request_output", None)
+        ro = req_output
         if ro and getattr(ro, "outputs", None):
             return "".join(getattr(o, "text", "") or "" for o in ro.outputs)
     return ""
diff --git a/tests/e2e/offline_inference/test_cosyvoice3_expansion.py b/tests/e2e/offline_inference/test_cosyvoice3_expansion.py
index 49079266d..fa1bdfead 100644
--- a/tests/e2e/offline_inference/test_cosyvoice3_expansion.py
+++ b/tests/e2e/offline_inference/test_cosyvoice3_expansion.py
@@ -28,7 +28,6 @@ from tests.helpers.media import get_asset_path
 from tests.helpers.runtime import OmniRunner
 from tests.helpers.stage_config import get_deploy_config_path
 from vllm_omni.model_executor.models.cosyvoice3.tokenizer import get_qwen_tokenizer
-from vllm_omni.outputs import OmniRequestOutput
 from vllm_omni.transformers_utils.configs.cosyvoice3 import CosyVoice3Config
 
 MODEL = "FunAudioLLM/Fun-CosyVoice3-0.5B-2512"
@@ -176,12 +175,12 @@ def test_cosyvoice3_offline_reference_zero_shot(omni_runner: OmniRunner) -> None
     assert 2.8 <= duration_s <= 8.8, f"Unexpected duration={duration_s:.3f}s (samples={audio.size}, sr={sr})"
 
     # Code2wav is ``final_output`` (stage 1); ``Omni.generate`` yields its ``request_output`` / completions.
-    pipeline_out = OmniRequestOutput.unwrap_result(outputs[0])
+    pipeline_out = outputs[0]
     assert pipeline_out.stage_id == 1, f"expected final stage 1, got {pipeline_out.stage_id}"
     assert pipeline_out.final_output_type == "audio", (
         f"expected audio final_output_type, got {pipeline_out.final_output_type!r}"
     )
-    ro = pipeline_out.request_output
+    ro = pipeline_out
     assert ro is not None, "stage 1 should include request_output"
     completions = getattr(ro, "outputs", None) or []
     assert completions, "stage 1 request_output should include at least one completion"
diff --git a/tests/e2e/offline_inference/test_dynin_omni_expansion.py b/tests/e2e/offline_inference/test_dynin_omni_expansion.py
index 19a847332..922518557 100644
--- a/tests/e2e/offline_inference/test_dynin_omni_expansion.py
+++ b/tests/e2e/offline_inference/test_dynin_omni_expansion.py
@@ -175,7 +175,7 @@ def _find_stage_output(outputs: list[Any], output_type: str) -> Any | None:
 
     # Prefer the latest finished chunk to avoid picking an intermediate stream output.
     for stage_output in reversed(matched):
-        if _is_finished_request_output(getattr(stage_output, "request_output", None)):
+        if _is_finished_request_output(stage_output):
             return stage_output
     return matched[-1]
 
@@ -205,7 +205,7 @@ def _to_token_list(value: Any) -> list[int]:
 
 
 def _extract_text(stage_output: Any, tokenizer: Any | None = None) -> str:
-    request_output = getattr(stage_output, "request_output", None)
+    request_output = stage_output
     if request_output is None:
         return ""
     req_list = request_output if isinstance(request_output, list) else [request_output]
@@ -240,7 +240,7 @@ def _extract_text(stage_output: Any, tokenizer: Any | None = None) -> str:
 
 
 def _extract_audio(stage_output: Any) -> Any | None:
-    request_output = getattr(stage_output, "request_output", None)
+    request_output = stage_output
     if request_output is None:
         return None
     req_list = request_output if isinstance(request_output, list) else [request_output]
@@ -256,7 +256,7 @@ def _extract_audio(stage_output: Any) -> Any | None:
 
 
 def _extract_image(stage_output: Any) -> Any | None:
-    request_output = getattr(stage_output, "request_output", None)
+    request_output = stage_output
     if request_output is None:
         return None
     req_list = request_output if isinstance(request_output, list) else [request_output]
diff --git a/tests/e2e/offline_inference/test_flux1_dev_autoround_w4a16_expansion.py b/tests/e2e/offline_inference/test_flux1_dev_autoround_w4a16_expansion.py
index 4e9e30712..ec48a49f7 100644
--- a/tests/e2e/offline_inference/test_flux1_dev_autoround_w4a16_expansion.py
+++ b/tests/e2e/offline_inference/test_flux1_dev_autoround_w4a16_expansion.py
@@ -54,7 +54,7 @@ def _sampling_params() -> OmniDiffusionSamplingParams:
 def _first_request_images(outputs) -> list:
     first_output = outputs[0]
     assert first_output.final_output_type == "image"
-    req_out = first_output.request_output
+    req_out = first_output
     assert isinstance(req_out, OmniRequestOutput) and hasattr(req_out, "images")
     return req_out.images
 
diff --git a/tests/e2e/offline_inference/test_glm_image_autoround_w4a16_expansion.py b/tests/e2e/offline_inference/test_glm_image_autoround_w4a16_expansion.py
index 2ea4dc641..28eaab9b3 100644
--- a/tests/e2e/offline_inference/test_glm_image_autoround_w4a16_expansion.py
+++ b/tests/e2e/offline_inference/test_glm_image_autoround_w4a16_expansion.py
@@ -161,7 +161,7 @@ def test_glm_image_autoround_w4a16_generates_image(omni_runner_handler: OmniRunn
 
     first_output = outputs[0]
     assert first_output.final_output_type == "image"
-    req_out = first_output.request_output
+    req_out = first_output
     assert isinstance(req_out, OmniRequestOutput) and hasattr(req_out, "images")
     images = req_out.images
 
@@ -224,7 +224,7 @@ def test_glm_image_autoround_w4a16_image_to_image(omni_runner_handler: OmniRunne
 
     first_output = outputs[0]
     assert first_output.final_output_type == "image"
-    req_out = first_output.request_output
+    req_out = first_output
     assert isinstance(req_out, OmniRequestOutput) and hasattr(req_out, "images")
     images = req_out.images
 
diff --git a/tests/e2e/offline_inference/test_hunyuanimage3.py b/tests/e2e/offline_inference/test_hunyuanimage3.py
index ebd338fe8..97179d963 100644
--- a/tests/e2e/offline_inference/test_hunyuanimage3.py
+++ b/tests/e2e/offline_inference/test_hunyuanimage3.py
@@ -288,7 +288,7 @@ def _extract_generated_image(outputs: list[object]) -> Image.Image:
     if images := getattr(first_output, "images", None):
         return images[0]
 
-    request_output = getattr(first_output, "request_output", None)
+    request_output = first_output
     if request_output is not None and (images := getattr(request_output, "images", None)):
         return images[0]
 
diff --git a/tests/e2e/offline_inference/test_hunyuanimage3_i2t_expansion.py b/tests/e2e/offline_inference/test_hunyuanimage3_i2t_expansion.py
index 008f0d2a9..4bdb42c34 100644
--- a/tests/e2e/offline_inference/test_hunyuanimage3_i2t_expansion.py
+++ b/tests/e2e/offline_inference/test_hunyuanimage3_i2t_expansion.py
@@ -74,7 +74,7 @@ def test_i2t_generates_text(omni: Omni) -> None:
     outputs = omni.generate(prompts=[prompt_dict])
     assert outputs, "No outputs returned from Omni.generate()"
 
-    request_output = outputs[0].request_output
+    request_output = outputs[0]
     assert request_output.outputs, "No completion outputs"
 
     completion = request_output.outputs[0]
diff --git a/tests/e2e/offline_inference/test_mammoth_moda2_expansion.py b/tests/e2e/offline_inference/test_mammoth_moda2_expansion.py
index 04308c4a7..ec1545f6a 100644
--- a/tests/e2e/offline_inference/test_mammoth_moda2_expansion.py
+++ b/tests/e2e/offline_inference/test_mammoth_moda2_expansion.py
@@ -172,7 +172,7 @@ def test_mammothmoda2_t2i_e2e(omni_runner: OmniRunner):
 
     found_image = False
     for out in outputs:
-        ro_list = getattr(out, "request_output", out)
+        ro_list = out
         if not isinstance(ro_list, list):
             ro_list = [ro_list]
         for ro in ro_list:
diff --git a/tests/e2e/offline_inference/test_ming_tts_expansion.py b/tests/e2e/offline_inference/test_ming_tts_expansion.py
index 82da74227..8dcefd182 100644
--- a/tests/e2e/offline_inference/test_ming_tts_expansion.py
+++ b/tests/e2e/offline_inference/test_ming_tts_expansion.py
@@ -137,14 +137,11 @@ def _extract_final_audio_outputs(outputs):
         if getattr(item, "final_output_type", None) == "audio":
             final_outputs.append(item)
             continue
-        request_output = getattr(item, "request_output", None)
-        if request_output is None:
-            continue
-        multimodal_output = getattr(request_output, "multimodal_output", None)
+        multimodal_output = getattr(item, "multimodal_output", None)
         if isinstance(multimodal_output, Mapping):
             final_outputs.append(item)
             continue
-        completions = getattr(request_output, "outputs", None) or []
+        completions = getattr(item, "outputs", None) or []
         if any(isinstance(getattr(completion, "multimodal_output", None), Mapping) for completion in completions):
             final_outputs.append(item)
     return final_outputs
@@ -155,16 +152,11 @@ def _extract_multimodal_output(output) -> Mapping[str, Any]:
     if isinstance(multimodal_output, Mapping):
         return multimodal_output
 
-    request_output = getattr(output, "request_output", None)
-    if request_output is not None:
-        multimodal_output = getattr(request_output, "multimodal_output", None)
+    completions = getattr(output, "outputs", None) or []
+    for completion in completions:
+        multimodal_output = getattr(completion, "multimodal_output", None)
         if isinstance(multimodal_output, Mapping):
             return multimodal_output
-        completions = getattr(request_output, "outputs", None) or []
-        for completion in completions:
-            multimodal_output = getattr(completion, "multimodal_output", None)
-            if isinstance(multimodal_output, Mapping):
-                return multimodal_output
 
     raise AssertionError("No multimodal audio output found in Ming generate results")
 
diff --git a/tests/e2e/offline_inference/test_moss_tts_nano_expansion.py b/tests/e2e/offline_inference/test_moss_tts_nano_expansion.py
index d3e7fcb0f..b894fe4ea 100644
--- a/tests/e2e/offline_inference/test_moss_tts_nano_expansion.py
+++ b/tests/e2e/offline_inference/test_moss_tts_nano_expansion.py
@@ -108,7 +108,7 @@ def _build_request(
 def _collect_audio(omni: Omni, request: dict) -> tuple[torch.Tensor, int]:
     """Run a single request and return (waveform, sample_rate)."""
     for stage_outputs in omni.generate(request, DEFAULT_SAMPLING):
-        req_output = stage_outputs.request_output
+        req_output = stage_outputs
         if req_output is not None:
             mm = req_output.outputs[0].multimodal_output
             assert mm is not None, "Expected multimodal_output to be non-None"
@@ -167,7 +167,7 @@ def test_moss_tts_nano_batch(omni_runner: OmniRunner, ref_audio_path) -> None:
     results = []
     # Single-stage model (num_stages=1): one sampling param for all requests.
     for stage_outputs in omni_runner.omni.generate(requests, [DEFAULT_SAMPLING]):
-        req_output = stage_outputs.request_output
+        req_output = stage_outputs
         if req_output is not None:
             mm = req_output.outputs[0].multimodal_output
             assert mm is not None
diff --git a/tests/e2e/offline_inference/test_omnivoice_expansion.py b/tests/e2e/offline_inference/test_omnivoice_expansion.py
index e3a138112..5b4c7a935 100644
--- a/tests/e2e/offline_inference/test_omnivoice_expansion.py
+++ b/tests/e2e/offline_inference/test_omnivoice_expansion.py
@@ -58,7 +58,7 @@ def test_omnivoice_text_to_audio(omni_runner: OmniRunner) -> None:
 
     # Check final output has audio
     final_output = outputs[-1]
-    ro = final_output.request_output
+    ro = final_output
     assert ro is not None, "No request_output"
 
     mm = getattr(ro, "multimodal_output", None)
diff --git a/tests/e2e/offline_inference/test_qwen_image_autoround_w4a16_expansion.py b/tests/e2e/offline_inference/test_qwen_image_autoround_w4a16_expansion.py
index 8d7d31882..e7b4d061e 100644
--- a/tests/e2e/offline_inference/test_qwen_image_autoround_w4a16_expansion.py
+++ b/tests/e2e/offline_inference/test_qwen_image_autoround_w4a16_expansion.py
@@ -42,7 +42,7 @@ def _sampling_params() -> OmniDiffusionSamplingParams:
 def _first_request_images(outputs) -> list:
     first_output = outputs[0]
     assert first_output.final_output_type == "image"
-    req_out = first_output.request_output
+    req_out = first_output
     assert isinstance(req_out, OmniRequestOutput) and hasattr(req_out, "images")
     return req_out.images
 
diff --git a/tests/e2e/offline_inference/test_stable_audio_expansion.py b/tests/e2e/offline_inference/test_stable_audio_expansion.py
index fc3b5596d..00ecd09d9 100644
--- a/tests/e2e/offline_inference/test_stable_audio_expansion.py
+++ b/tests/e2e/offline_inference/test_stable_audio_expansion.py
@@ -62,9 +62,9 @@ def generate_stable_audio_short_clip(
     # Audio-output diffusion pipelines (those with ``support_audio_output = True``) now have
     # ``final_output_type="audio"`` set on the outer stage metadata as well as the inner request.
     assert first_output.final_output_type == "audio"
-    assert hasattr(first_output, "request_output") and first_output.request_output
+    assert isinstance(first_output, OmniRequestOutput) and first_output
 
-    req_out = first_output.request_output
+    req_out = first_output
     assert isinstance(req_out, OmniRequestOutput)
     assert req_out.final_output_type == "audio"
     assert hasattr(req_out, "multimodal_output") and req_out.multimodal_output
diff --git a/tests/e2e/offline_inference/test_step_audio2_expansion.py b/tests/e2e/offline_inference/test_step_audio2_expansion.py
index cac4fbe52..483396b23 100644
--- a/tests/e2e/offline_inference/test_step_audio2_expansion.py
+++ b/tests/e2e/offline_inference/test_step_audio2_expansion.py
@@ -63,8 +63,8 @@ def _assert_non_empty_text_output(outputs: list[OmniRequestOutput]) -> None:
 
     text_output = next((o for o in outputs if o.final_output_type == "text"), None)
     assert text_output is not None
-    assert text_output.request_output is not None
-    text_content = text_output.request_output.outputs[0].text
+    assert text_output is not None
+    text_content = text_output.outputs[0].text
     assert text_content is not None
     assert len(text_content.strip()) > 0
 
@@ -81,8 +81,8 @@ def test_audio_to_text_and_audio(omni_runner: OmniRunner) -> None:
 
     audio_output = next((o for o in outputs if o.final_output_type == "audio"), None)
     if audio_output is not None:
-        assert audio_output.request_output is not None
-        audio_tensor = audio_output.request_output.outputs[0].multimodal_output.get("audio")
+        assert audio_output is not None
+        audio_tensor = audio_output.outputs[0].multimodal_output.get("audio")
         if audio_tensor is not None:
             assert audio_tensor.numel() > 0
 
diff --git a/tests/e2e/online_serving/test_minicpmo_realtime_duplex_drivers.py b/tests/e2e/online_serving/test_minicpmo_realtime_duplex_drivers.py
index 87d635807..b2e40c58f 100644
--- a/tests/e2e/online_serving/test_minicpmo_realtime_duplex_drivers.py
+++ b/tests/e2e/online_serving/test_minicpmo_realtime_duplex_drivers.py
@@ -65,7 +65,7 @@ def test_realtime_duplex_multi_session_script_is_directly_executable():
         cwd=MULTI_DEMO_PATH.parents[3],
         capture_output=True,
         text=True,
-        timeout=20,
+        timeout=60,
         check=False,
     )
 
@@ -78,7 +78,7 @@ def test_realtime_duplex_demo_pair_script_is_directly_executable():
         cwd=PAIR_DEMO_PATH.parents[3],
         capture_output=True,
         text=True,
-        timeout=20,
+        timeout=60,
         check=False,
     )
 
@@ -91,7 +91,7 @@ def test_realtime_duplex_soft_interrupt_script_is_directly_executable():
         cwd=SOFT_INTERRUPT_DEMO_PATH.parents[3],
         capture_output=True,
         text=True,
-        timeout=20,
+        timeout=60,
         check=False,
     )
 
diff --git a/tests/engine/test_async_omni_engine_abort.py b/tests/engine/test_async_omni_engine_abort.py
index dfe00732f..40f89df84 100644
--- a/tests/engine/test_async_omni_engine_abort.py
+++ b/tests/engine/test_async_omni_engine_abort.py
@@ -50,7 +50,7 @@ async def generate(
         output_modalities=["text"],
     ):
         stage_id = omni_output.stage_id
-        out = omni_output.request_output
+        out = omni_output
         if stage_id == 0:
             num_tokens = sum(len(output.token_ids) for output in out.outputs)
             count = num_tokens
diff --git a/tests/engine/test_omni_request_output.py b/tests/engine/test_omni_request_output.py
index 8da19a498..fa25bba9e 100644
--- a/tests/engine/test_omni_request_output.py
+++ b/tests/engine/test_omni_request_output.py
@@ -4,171 +4,269 @@
 
 import pytest
 from PIL import Image
-from pytest_mock import MockerFixture
+from vllm.outputs import CompletionOutput, RequestOutput
 
 from vllm_omni.outputs import OmniRequestOutput
 
 pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
 
 
-class TestOmniRequestOutput:
-    """Tests for OmniRequestOutput class."""
+# ── helpers ────────────────────────────────────────────────────────────────
 
-    def test_from_diffusion(self):
-        """Test creating output from diffusion model."""
-        images = [Image.new("RGB", (64, 64), color="red")]
-        output = OmniRequestOutput.from_diffusion(
-            request_id="test-123",
-            images=images,
-            prompt="a cat",
+
+def _make_text_request_output(
+    request_id: str = "req-1",
+    text: str = "hello world",
+    token_ids: list[int] | None = None,
+    finished: bool = True,
+) -> RequestOutput:
+    """Build a minimal vLLM RequestOutput for testing."""
+    return RequestOutput(
+        request_id=request_id,
+        prompt="test prompt",
+        prompt_token_ids=[1, 2, 3],
+        prompt_logprobs=None,
+        outputs=[
+            CompletionOutput(
+                index=0,
+                text=text,
+                token_ids=token_ids or [10, 11, 12],
+                cumulative_logprob=-1.0,
+                logprobs=None,
+                finish_reason="stop" if finished else None,
+                stop_reason=None,
+            )
+        ],
+        finished=finished,
+        metrics=None,
+        lora_request=None,
+    )
+
+
+# ── from_stage_output ──────────────────────────────────────────────────────
+
+
+class TestFromStageOutput:
+    """Tests for OmniRequestOutput.from_stage_output()."""
+
+    def test_copies_request_output_content(self):
+        """Content from a vLLM RequestOutput is flattened onto the new object."""
+        source = _make_text_request_output(text="copied text")
+        out = OmniRequestOutput.from_stage_output(source, request_id="req-1", stage_id=0, final_output_type="text")
+
+        assert out.prompt == "test prompt"
+        assert out.prompt_token_ids == [1, 2, 3]
+        assert len(out.outputs) == 1
+        assert out.outputs[0].text == "copied text"
+        assert out.finished is True
+        assert out.stage_id == 0
+        assert out.final_output_type == "text"
+
+    def test_copies_omni_content(self):
+        """Diffusion fields are copied when source is another OmniRequestOutput."""
+        image = Image.new("RGB", (64, 64), color="blue")
+        inner = OmniRequestOutput.from_diffusion(request_id="req-diff", images=[image], prompt="a cat")
+        outer = OmniRequestOutput.from_stage_output(inner, request_id="req-diff", stage_id=0, final_output_type="image")
+
+        assert len(outer.images) == 1
+        assert outer.images[0] is image
+        assert outer.prompt == "a cat"
+        assert outer.is_diffusion_output
+
+    def test_with_duck_typed_source(self):
+        """A duck-typed source (SimpleNamespace-style) copies correctly."""
+        from types import SimpleNamespace
+
+        source = SimpleNamespace(
+            outputs=[],
+            prompt="duck prompt",
+            prompt_token_ids=[7, 8, 9],
+            finished=False,
+        )
+        out = OmniRequestOutput.from_stage_output(source, request_id="duck-1", stage_id=2)
+
+        assert out.prompt == "duck prompt"
+        assert out.prompt_token_ids == [7, 8, 9]
+        assert out.finished is False
+        assert out.stage_id == 2
+
+    def test_request_id_always_copied_from_source(self):
+        """request_id is always copied from source, even when passed in kwargs."""
+        source = _make_text_request_output(request_id="source-id")
+        out = OmniRequestOutput.from_stage_output(source, request_id="kwargs-id", stage_id=1)
+        # Source wins — request_id is content, not a control field.
+        assert out.request_id == "source-id"
+
+    def test_passes_control_fields(self):
+        """Control fields (metrics, stage_durations, peak_memory_mb) are set."""
+        source = _make_text_request_output()
+        out = OmniRequestOutput.from_stage_output(
+            source,
+            request_id="r1",
+            stage_id=3,
+            metrics={"ttft": 0.5},
+            stage_durations={"prefill": 0.12},
+            peak_memory_mb=1024.0,
+        )
+
+        assert out.metrics == {"ttft": 0.5}
+        assert out.stage_durations == {"prefill": 0.12}
+        assert out.peak_memory_mb == 1024.0
+
+    def test_finished_field_copied(self):
+        """The *finished* flag is copied from the source when present."""
+        source = _make_text_request_output(finished=False)
+        out = OmniRequestOutput.from_stage_output(source, request_id="r1")
+        assert out.finished is False
+
+        source2 = _make_text_request_output(finished=True)
+        out2 = OmniRequestOutput.from_stage_output(source2, request_id="r2")
+        assert out2.finished is True
+
+    def test_outputs_field_copied(self):
+        """The *outputs* list is copied from the source."""
+        source = _make_text_request_output(text="hello", token_ids=[1, 2, 3])
+        out = OmniRequestOutput.from_stage_output(source, request_id="r1")
+
+        assert len(out.outputs) == 1
+        assert out.outputs[0].text == "hello"
+        assert out.outputs[0].token_ids == [1, 2, 3]
+
+
+# ── dataclass safety ────────────────────────────────────────────────────────
+
+
+class TestDataclassSafety:
+    def test_from_stage_output_is_classmethod(self):
+        """from_stage_output must be a classmethod."""
+        assert callable(OmniRequestOutput.from_stage_output)
+
+
+# ── msgpack round-trip ─────────────────────────────────────────────────────
+
+
+class TestMsgpackRoundTrip:
+    """Tests that OmniRequestOutput survives msgpack encode → decode without
+    infinite recursion or data loss."""
+
+    def test_round_trip_pipeline_output(self):
+        """A pipeline output round-trips without data loss."""
+        from vllm_omni.distributed.omni_connectors.utils.serialization import (
+            OmniMsgpackDecoder,
+            OmniMsgpackEncoder,
+        )
+
+        source = _make_text_request_output(text="round trip")
+        out = OmniRequestOutput.from_stage_output(
+            source,
+            request_id="rt-1",
+            stage_id=0,
+            final_output_type="text",
+        )
+
+        encoder = OmniMsgpackEncoder()
+        decoder = OmniMsgpackDecoder()
+
+        encoded = encoder.encode(out)
+        decoded = decoder.decode(encoded)
+
+        assert isinstance(decoded, OmniRequestOutput)
+        assert decoded.request_id == "req-1"
+        assert decoded.stage_id == 0
+        assert decoded.final_output_type == "text"
+        assert decoded.finished is True
+        assert decoded.outputs[0].text == "round trip"
+        assert decoded.prompt == "test prompt"
+        assert decoded.prompt_token_ids == [1, 2, 3]
+
+    def test_round_trip_diffusion_output(self):
+        """A diffusion output round-trips without data loss."""
+        from vllm_omni.distributed.omni_connectors.utils.serialization import (
+            OmniMsgpackDecoder,
+            OmniMsgpackEncoder,
+        )
+
+        image = Image.new("RGB", (64, 64), color="red")
+        out = OmniRequestOutput.from_diffusion(
+            request_id="diff-1",
+            images=[image],
+            prompt="a red image",
             metrics={"steps": 50},
-        )
-        assert output.request_id == "test-123"
-        assert output.images == images
-        assert output.prompt == "a cat"
-        assert output.metrics == {"steps": 50}
-        assert output.is_diffusion_output
-        assert output.num_images == 1
-
-    def test_from_pipeline(self, mocker: MockerFixture):
-        """Test creating output from pipeline stage."""
-        mock_request_output = mocker.Mock()
-        mock_request_output.request_id = "pipeline-123"
-        mock_request_output.prompt_token_ids = [1, 2, 3]
-        mock_request_output.outputs = [mocker.Mock()]
-        mock_request_output.encoder_prompt_token_ids = None
-        mock_request_output.prompt_logprobs = None
-        mock_request_output.num_cached_tokens = 10
-        mock_request_output.kv_transfer_params = None
-        mock_request_output.multimodal_output = {"image": mocker.Mock()}
-
-        output = OmniRequestOutput.from_pipeline(
-            stage_id=0,
-            final_output_type="text",
-            request_output=mock_request_output,
+            multimodal_output={"audio": None},
         )
 
-        assert output.request_id == "pipeline-123"
-        assert output.stage_id == 0
-        assert output.final_output_type == "text"
-        assert output.is_pipeline_output
+        encoder = OmniMsgpackEncoder()
+        decoder = OmniMsgpackDecoder()
 
-    def test_prompt_token_ids_property(self, mocker: MockerFixture):
-        """Test prompt_token_ids property for streaming compatibility."""
-        mock_request_output = mocker.Mock()
-        mock_request_output.prompt_token_ids = [1, 2, 3, 4, 5]
+        encoded = encoder.encode(out)
+        decoded = decoder.decode(encoded)
 
-        output = OmniRequestOutput.from_pipeline(
-            stage_id=0,
-            final_output_type="text",
-            request_output=mock_request_output,
+        assert isinstance(decoded, OmniRequestOutput)
+        assert decoded.request_id == "diff-1"
+        assert decoded.prompt == "a red image"
+        assert decoded.num_images == 1
+        assert decoded.images[0].size == (64, 64)
+        assert decoded.metrics == {"steps": 50}
+
+    def test_round_trip_does_not_recurse(self):
+        """Encoding a pipeline output must not trigger infinite recursion."""
+        from vllm_omni.distributed.omni_connectors.utils.serialization import (
+            OmniMsgpackEncoder,
         )
 
-        assert output.prompt_token_ids == [1, 2, 3, 4, 5]
+        source = _make_text_request_output(text="no recursion")
+        out = OmniRequestOutput.from_stage_output(source, request_id="rec-1", stage_id=0)
 
-    def test_prompt_token_ids_none_when_no_request_output(self):
-        """Test prompt_token_ids returns None when no request_output."""
-        output = OmniRequestOutput.from_diffusion(
-            request_id="test-123",
-            images=[],
-            prompt="a cat",
-        )
-        assert output.prompt_token_ids is None
+        encoder = OmniMsgpackEncoder()
+        encoded = encoder.encode(out)
+        assert isinstance(encoded, bytes)
+        assert len(encoded) > 0
 
-    def test_outputs_property(self, mocker: MockerFixture):
-        """Test outputs property for chat completion compatibility."""
-        mock_output = mocker.Mock()
-        mock_request_output = mocker.Mock()
-        mock_request_output.outputs = [mock_output]
-
-        output = OmniRequestOutput.from_pipeline(
-            stage_id=0,
-            final_output_type="text",
-            request_output=mock_request_output,
+    def test_legacy_wire_format_deserialized(self):
+        """When the wire format contains a nested ``request_output`` key
+        (pre-inheritance legacy), it is merged via _copy_content_from."""
+        from vllm_omni.distributed.omni_connectors.utils.serialization import (
+            OmniMsgpackDecoder,
         )
 
-        assert output.outputs == [mock_output]
+        # Build a legacy-style dict: OmniRequestOutput fields + a nested
+        # request_output dict containing RequestOutput-like content.
+        legacy_dict = {
+            "request_id": "legacy-1",
+            "finished": True,
+            "stage_id": 1,
+            "final_output_type": "text",
+            "images": [],
+            "_multimodal_output": {},
+            "_custom_output": {},
+            "stage_durations": {},
+            "peak_memory_mb": 0.0,
+            # --- nested request_output key (legacy) ---
+            "request_output": {
+                "request_id": "legacy-1",
+                "prompt": "legacy prompt",
+                "prompt_token_ids": [1, 2],
+                "prompt_logprobs": None,
+                "outputs": [],
+                "finished": True,
+                "metrics": {},
+                "lora_request": None,
+                "encoder_prompt": None,
+                "encoder_prompt_token_ids": None,
+                "num_cached_tokens": None,
+                "kv_transfer_params": None,
+            },
+        }
 
-    def test_outputs_empty_when_no_request_output(self):
-        """Test outputs returns empty list when no request_output."""
-        output = OmniRequestOutput.from_diffusion(
-            request_id="test-123",
-            images=[],
-            prompt="a cat",
-        )
-        assert output.outputs == []
+        # Manually run the decoder's post_process to test legacy path.
+        # The decoder's _decode_omni_request_output pops "request_output"
+        # and merges it via _copy_content_from.
+        decoder = OmniMsgpackDecoder()
+        result = decoder._post_process(legacy_dict)
 
-    def test_encoder_prompt_token_ids_property(self, mocker: MockerFixture):
-        """Test encoder_prompt_token_ids property."""
-        mock_request_output = mocker.Mock()
-        mock_request_output.encoder_prompt_token_ids = [10, 20, 30]
-
-        output = OmniRequestOutput.from_pipeline(
-            stage_id=0,
-            final_output_type="text",
-            request_output=mock_request_output,
-        )
-
-        assert output.encoder_prompt_token_ids == [10, 20, 30]
-
-    def test_num_cached_tokens_property(self, mocker: MockerFixture):
-        """Test num_cached_tokens property."""
-        mock_request_output = mocker.Mock()
-        mock_request_output.num_cached_tokens = 42
-
-        output = OmniRequestOutput.from_pipeline(
-            stage_id=0,
-            final_output_type="text",
-            request_output=mock_request_output,
-        )
-
-        assert output.num_cached_tokens == 42
-
-    def test_multimodal_output_property(self, mocker: MockerFixture):
-        """Test multimodal_output property."""
-        mock_request_output = mocker.Mock()
-        mock_audio = mocker.Mock()
-        expected_output = {"audio": mock_audio}
-        mock_request_output.outputs = []
-        mock_request_output.multimodal_output = expected_output
-
-        output = OmniRequestOutput.from_pipeline(
-            stage_id=0,
-            final_output_type="audio",
-            request_output=mock_request_output,
-        )
-
-        assert output.multimodal_output is expected_output
-
-    def test_to_dict_diffusion(self):
-        """Test to_dict for diffusion output."""
-        output = OmniRequestOutput.from_diffusion(
-            request_id="test-123",
-            images=[Image.new("RGB", (64, 64), color="red")],
-            prompt="a cat",
-            metrics={"steps": 50},
-        )
-        result = output.to_dict()
-
-        assert result["request_id"] == "test-123"
-        assert result["finished"] is True
-        assert result["final_output_type"] == "image"
-        assert result["num_images"] == 1
-        assert result["prompt"] == "a cat"
-
-    def test_to_dict_pipeline(self, mocker: MockerFixture):
-        """Test to_dict for pipeline output."""
-        mock_request_output = mocker.Mock()
-        mock_request_output.request_id = "pipeline-123"
-
-        output = OmniRequestOutput.from_pipeline(
-            stage_id=0,
-            final_output_type="text",
-            request_output=mock_request_output,
-        )
-        result = output.to_dict()
-
-        assert result["request_id"] == "pipeline-123"
-        assert result["finished"] is True
-        assert result["final_output_type"] == "text"
-        assert result["stage_id"] == 0
+        assert isinstance(result, OmniRequestOutput)
+        assert result.request_id == "legacy-1"
+        assert result.finished is True
+        # Content merged from legacy nested key
+        assert result.prompt == "legacy prompt"
+        assert result.prompt_token_ids == [1, 2]
diff --git a/tests/entrypoints/openai_api/test_duplex_handler.py b/tests/entrypoints/openai_api/test_duplex_handler.py
index 1ee454213..a37d9d2b1 100644
--- a/tests/entrypoints/openai_api/test_duplex_handler.py
+++ b/tests/entrypoints/openai_api/test_duplex_handler.py
@@ -2156,12 +2156,12 @@ def test_direct_listen_decision_survives_inner_completion_metadata():
     )
     assert decision is not None
     output = attach_duplex_output_decision(
-        OmniRequestOutput(
+        OmniRequestOutput.from_stage_output(
+            inner_output,
             request_id="duplex-direct-listen",
             finished=True,
             stage_id=0,
             final_output_type=decision.final_output_type,
-            request_output=inner_output,
             metrics={
                 "stage_metrics": {
                     "0": {
@@ -3049,12 +3049,12 @@ async def test_minicpmo_auto_response_listen_without_response_does_not_defer_com
     )
     assert decision is not None
     listen_output = attach_duplex_output_decision(
-        OmniRequestOutput(
+        OmniRequestOutput.from_stage_output(
+            inner_output,
             request_id=request_id,
             finished=True,
             stage_id=0,
             final_output_type=decision.final_output_type,
-            request_output=inner_output,
         ),
         decision,
     )
diff --git a/tests/entrypoints/openai_api/test_image_server.py b/tests/entrypoints/openai_api/test_image_server.py
index 19240c39c..2136d84f8 100644
--- a/tests/entrypoints/openai_api/test_image_server.py
+++ b/tests/entrypoints/openai_api/test_image_server.py
@@ -119,7 +119,6 @@ class MockGenerationResult:
 
     def __init__(self, images):
         self.images = images
-        self.request_output = SimpleNamespace(images=images)
         self.stage_durations = {}
         self.peak_memory_mb = 0.0
 
@@ -137,10 +136,7 @@ class MockStageResult:
             outputs = [SimpleNamespace(text=text, index=0)]
         else:
             outputs = []
-        self.request_output = SimpleNamespace(
-            outputs=outputs,
-            images=self.images,
-        )
+        self.outputs = outputs
         self.stage_durations = {}
         self.peak_memory_mb = 0.0
 
@@ -2080,22 +2076,20 @@ def test_extract_images_from_result():
     assert all(isinstance(img, Image.Image) for img in images)
     assert all(img.size == (64, 64) for img in images)
 
-    # Test dict path: result.request_output["images"]
+    # Test result with "images" attribute set in __init__
     class DictRequestOutput:
         def __init__(self):
-            self.request_output = {"images": [np.random.randint(0, 255, (64, 64, 3), dtype=np.uint8)]}
+            self.images = [np.random.randint(0, 255, (64, 64, 3), dtype=np.uint8)]
 
     result = DictRequestOutput()
     images = _extract_images_from_result(result)
     assert len(images) == 1
     assert isinstance(images[0], Image.Image)
 
-    # Test attribute path: result.request_output.images
+    # Test result with "images" attribute from an inner object
     class AttrRequestOutput:
         def __init__(self):
-            self.request_output = type(
-                "obj", (), {"images": [np.random.randint(0, 255, (32, 32, 3), dtype=np.uint8)]}
-            )()
+            self.images = [np.random.randint(0, 255, (32, 32, 3), dtype=np.uint8)]
 
     result = AttrRequestOutput()
     images = _extract_images_from_result(result)
diff --git a/tests/entrypoints/openai_api/test_serving_speech.py b/tests/entrypoints/openai_api/test_serving_speech.py
index 32de8ac62..bcb89ff88 100644
--- a/tests/entrypoints/openai_api/test_serving_speech.py
+++ b/tests/entrypoints/openai_api/test_serving_speech.py
@@ -180,10 +180,10 @@ def create_mock_audio_output_for_test(
     audio_tensor = torch.sin(torch.linspace(0, 440 * 2 * torch.pi, num_samples))
     mock_request_output = MockRequestOutput(request_id=request_id, audio_tensor=audio_tensor)
 
-    return OmniRequestOutput(
+    return OmniRequestOutput.from_stage_output(
+        mock_request_output,
         stage_id=0,
         final_output_type="audio",
-        request_output=mock_request_output,
     )
 
 
@@ -2292,10 +2292,10 @@ class TestStreamingResponse:
                     self.prompt_logprobs = None
                     self.kv_transfer_params = None
 
-            return OmniRequestOutput(
+            return OmniRequestOutput.from_stage_output(
+                MockRequestOutput(audio_tensor=chunk),
                 stage_id=0,
                 final_output_type="audio",
-                request_output=MockRequestOutput(audio_tensor=chunk),
                 finished=finished,
             )
 
@@ -3441,10 +3441,10 @@ class TestWAVStreaming:
                     self.prompt_logprobs = None
                     self.kv_transfer_params = None
 
-            return OmniRequestOutput(
+            return OmniRequestOutput.from_stage_output(
+                MockRequestOutput(audio_tensor=chunk),
                 stage_id=0,
                 final_output_type="audio",
-                request_output=MockRequestOutput(audio_tensor=chunk),
                 finished=finished,
             )
 
diff --git a/tests/entrypoints/openai_api/test_serving_video_stream.py b/tests/entrypoints/openai_api/test_serving_video_stream.py
index fc8d83da6..bc80fe0db 100644
--- a/tests/entrypoints/openai_api/test_serving_video_stream.py
+++ b/tests/entrypoints/openai_api/test_serving_video_stream.py
@@ -47,7 +47,7 @@ def _text_result(text: str) -> OmniRequestOutput:
     output.text = text
     request_output = RequestOutput()
     request_output.outputs = [output]
-    return OmniRequestOutput(final_output_type="text", request_output=request_output)
+    return OmniRequestOutput.from_stage_output(request_output, final_output_type="text")
 
 
 def _audio_result(audio_data: Any) -> OmniRequestOutput:
@@ -61,7 +61,7 @@ def _audio_result(audio_data: Any) -> OmniRequestOutput:
     output.multimodal_output = {"audio": audio_data}
     request_output = RequestOutput()
     request_output.outputs = [output]
-    return OmniRequestOutput(final_output_type="audio", request_output=request_output)
+    return OmniRequestOutput.from_stage_output(request_output, final_output_type="audio")
 
 
 class MockWebSocket:
diff --git a/tests/entrypoints/test_async_omni_duplex.py b/tests/entrypoints/test_async_omni_duplex.py
index 62f3f49ad..46bf668b3 100644
--- a/tests/entrypoints/test_async_omni_duplex.py
+++ b/tests/entrypoints/test_async_omni_duplex.py
@@ -480,11 +480,9 @@ def test_async_omni_duplex_direct_output_prefers_outer_control_metadata():
         OmniRequestOutput(
             request_id="duplex-sid-e0-stage0",
             stage_id=0,
-            request_output=SimpleNamespace(
-                outputs=[],
-                multimodal_output=SimpleNamespace(kind="processed-payload"),
-                _custom_output={"inner": "completion"},
-            ),
+            outputs=[],
+            _multimodal_output={"kind": "processed-payload"},
+            _custom_output={"inner": "completion"},
         ),
         decision,
     )
@@ -557,7 +555,7 @@ async def test_async_omni_duplex_collect_wraps_raw_response_stage_output():
     assert outputs[0].finished is False
     assert outputs[0].stage_id == 1
     assert outputs[0].final_output_type == "audio"
-    assert outputs[0].request_output is raw_stage1_output
+    assert outputs[0].peak_memory_mb == raw_stage1_output.peak_memory_mb
 
 
 def test_async_omni_duplex_request_info_includes_response_stage():
diff --git a/tests/entrypoints/test_omni_entrypoints.py b/tests/entrypoints/test_omni_entrypoints.py
index d7f424d6e..161b3fe2a 100644
--- a/tests/entrypoints/test_omni_entrypoints.py
+++ b/tests/entrypoints/test_omni_entrypoints.py
@@ -72,8 +72,8 @@ def make_output_msg(
         final_output_type=final_output_type,
         images=images or [],
         stage_durations={},
+        outputs=[SimpleNamespace(text=payload, index=0)],
     )
-    engine_output.payload = payload
     return OutputMessage(
         request_id=request_id,
         stage_id=stage_id,
@@ -474,7 +474,7 @@ async def test_async_omni_yields_only_final_stage_outputs(monkeypatch: pytest.Mo
         app.shutdown()
 
     assert [output.stage_id for output in outputs] == [2]
-    assert [output.request_output.payload for output in outputs] == ["final"]
+    assert [output.outputs[0].text for output in outputs] == ["final"]
     assert "req-1" not in app.request_states
 
 
@@ -492,7 +492,7 @@ async def test_async_omni_accepts_multiple_final_stage_streams(monkeypatch: pyte
         app.shutdown()
 
     assert [output.stage_id for output in outputs] == [0, 0, 0, 2, 2, 2]
-    assert [output.request_output.payload for output in outputs] == [
+    assert [output.outputs[0].text for output in outputs] == [
         "req-1-stage0-0",
         "req-1-stage0-1",
         "req-1-stage0-2",
@@ -517,7 +517,7 @@ async def test_async_omni_stops_on_final_stage_finished(monkeypatch: pytest.Monk
     finally:
         app.shutdown()
 
-    assert [output.request_output.payload for output in outputs] == [
+    assert [output.outputs[0].text for output in outputs] == [
         "req-1-stage0",
         "req-1-stage2-final",
     ]
@@ -544,7 +544,7 @@ async def test_async_omni_diffusion_only_yields_single_image_output(monkeypatch:
     assert outputs[0].stage_id == 0
     assert outputs[0].final_output_type == "image"
     assert outputs[0].images == ["req-1-image"]
-    assert outputs[0].request_output.payload == "req-1-diffusion-final"
+    assert outputs[0].outputs[0].text == "req-1-diffusion-final"
 
 
 @pytest.mark.asyncio
@@ -565,7 +565,7 @@ async def test_async_omni_llm_diffusion_yields_text_stream_then_image(monkeypatc
 
     assert [output.stage_id for output in outputs] == [0, 0, 0, 1]
     assert [output.final_output_type for output in outputs] == ["text", "text", "text", "image"]
-    assert [output.request_output.payload for output in outputs] == [
+    assert [output.outputs[0].text for output in outputs] == [
         "req-1-text-0",
         "req-1-text-1",
         "req-1-text-2",
@@ -695,7 +695,7 @@ def test_omni_generate_py_generator_yields_final_outputs_for_each_request(monkey
 
     assert len(outputs) == 4
     assert [output.stage_id for output in outputs] == [0, 2, 0, 2]
-    assert [output.request_output.payload for output in outputs] == [
+    assert [output.outputs[0].text for output in outputs] == [
         f"{engine.submitted[0]['request_id']}-stage0-0",
         f"{engine.submitted[0]['request_id']}-stage2-final",
         f"{engine.submitted[1]['request_id']}-stage0-0",
@@ -739,7 +739,7 @@ def test_omni_generate_diffusion_only_yields_single_image_per_request(monkeypatc
     assert len(outputs) == 2
     assert [output.stage_id for output in outputs] == [0, 0]
     assert [output.final_output_type for output in outputs] == ["image", "image"]
-    assert [output.request_output.payload for output in outputs] == [
+    assert [output.outputs[0].text for output in outputs] == [
         f"{engine.submitted[0]['request_id']}-diffusion-final",
         f"{engine.submitted[1]['request_id']}-diffusion-final",
     ]
@@ -767,7 +767,7 @@ def test_omni_generate_llm_diffusion_yields_final_text_then_image_per_request(
     assert len(outputs) == 4
     assert [output.stage_id for output in outputs] == [0, 1, 0, 1]
     assert [output.final_output_type for output in outputs] == ["text", "image", "text", "image"]
-    assert [output.request_output.payload for output in outputs] == [
+    assert [output.outputs[0].text for output in outputs] == [
         f"{engine.submitted[0]['request_id']}-text-0",
         f"{engine.submitted[0]['request_id']}-image-final",
         f"{engine.submitted[1]['request_id']}-text-0",
@@ -1046,7 +1046,6 @@ def _enqueue_stage_error(
     if kill_engine:
         engine._alive = False
     engine_output = OmniRequestOutput.from_error(msg["request_id"], error_text)
-    engine_output.payload = ""
     engine.output_q.put_nowait(
         OutputMessage(
             request_id=msg["request_id"],
diff --git a/tests/entrypoints/test_stream_finish_reason.py b/tests/entrypoints/test_stream_finish_reason.py
index 3d6052045..b02936838 100644
--- a/tests/entrypoints/test_stream_finish_reason.py
+++ b/tests/entrypoints/test_stream_finish_reason.py
@@ -69,10 +69,10 @@ def _make_text_omni_output(
         ],
         finished=finish_reason is not None,
     )
-    return OmniRequestOutput(
+    return OmniRequestOutput.from_stage_output(
+        res,
         request_id=request_id,
         final_output_type="text",
-        request_output=res,
         finished=finish_reason is not None,
     )
 
@@ -108,12 +108,12 @@ def _make_audio_omni_output(
         outputs=[completion],
         finished=True,
     )
-    return OmniRequestOutput(
+    return OmniRequestOutput.from_stage_output(
+        res,
         request_id=request_id,
         stage_id=stage_id,
         replica_id=replica_id,
         final_output_type="audio",
-        request_output=res,
         finished=True,
     )
 
@@ -151,7 +151,7 @@ def _build_serving_chat():
     )
     instance._create_audio_choice = MagicMock(
         side_effect=lambda omni_res, role, request, stream=False: _mock_audio_choices(
-            index=omni_res.request_output.outputs[0].index,
+            index=omni_res.outputs[0].index,
             role=role,
         )
     )
@@ -489,7 +489,7 @@ async def test_audio_chunk_without_waveform_keeps_stream_alive():
     request = _make_request(modalities=["text", "audio"])
 
     empty_audio = _make_audio_omni_output()
-    empty_audio.request_output.outputs[0].multimodal_output = {"audio": []}
+    empty_audio.outputs[0].multimodal_output = {"audio": []}
 
     def create_audio_choice(omni_res, role, request, stream=False):
         return OmniOpenAIServingChat._create_audio_choice(serving_chat, omni_res, role, request, stream=stream)
diff --git a/tests/helpers/media.py b/tests/helpers/media.py
index 93e136f57..8eb82fc1f 100644
--- a/tests/helpers/media.py
+++ b/tests/helpers/media.py
@@ -26,10 +26,28 @@ from PIL import Image
 logger = logging.getLogger(__name__)
 
 
+_synthetic_media_fallback_dir: Path | None = None
+
+
 def _resolve_synthetic_media_cache_dir(cache_dir: Path | str | None) -> Path:
     if cache_dir is not None:
         return Path(cache_dir).expanduser().resolve()
-    return Path(tempfile.gettempdir()) / "vllm_omni_test_synthetic_media"
+
+    default = Path(tempfile.gettempdir()) / "vllm_omni_test_synthetic_media"
+    try:
+        default.mkdir(parents=True, exist_ok=True)
+        # Verify write access: the directory may exist but belong to
+        # another user (e.g. a previous CI job), causing PermissionError
+        # later when individual files are saved.
+        canary = default / ".write_test"
+        canary.touch()
+        canary.unlink()
+        return default
+    except (PermissionError, OSError):
+        global _synthetic_media_fallback_dir
+        if _synthetic_media_fallback_dir is None:
+            _synthetic_media_fallback_dir = Path(tempfile.mkdtemp(prefix="vllm_omni_test_synthetic_media_"))
+        return _synthetic_media_fallback_dir
 
 
 def _np_array_from_mp4_bytes(video_bytes: bytes) -> np.ndarray:
diff --git a/tests/helpers/runtime.py b/tests/helpers/runtime.py
index 962075df2..82fcc308d 100644
--- a/tests/helpers/runtime.py
+++ b/tests/helpers/runtime.py
@@ -2938,9 +2938,9 @@ class OmniRunnerHandler:
             audio_content = None
             for stage_output in outputs:
                 if getattr(stage_output, "final_output_type", None) == "text":
-                    text_content = stage_output.request_output.outputs[0].text
+                    text_content = stage_output.outputs[0].text
                 if getattr(stage_output, "final_output_type", None) == "audio":
-                    audio_content = stage_output.request_output.outputs[0].multimodal_output["audio"]
+                    audio_content = stage_output.outputs[0].multimodal_output["audio"]
             result.audio_content = audio_content
             result.text_content = text_content
             result.success = True
@@ -3080,7 +3080,7 @@ class OmniRunnerHandler:
         mm_out: dict[str, Any] | None = None
         for stage_out in outputs:
             if getattr(stage_out, "final_output_type", None) == "audio":
-                mm_out = stage_out.request_output.outputs[0].multimodal_output
+                mm_out = stage_out.outputs[0].multimodal_output
                 break
         if mm_out is None:
             raise AssertionError("No audio output from pipeline")
diff --git a/vllm_omni/diffusion/utils/image_output.py b/vllm_omni/diffusion/utils/image_output.py
index 5f8c9903a..10d586894 100644
--- a/vllm_omni/diffusion/utils/image_output.py
+++ b/vllm_omni/diffusion/utils/image_output.py
@@ -51,8 +51,13 @@ def _iter_multimodal_image_payloads(output: OmniRequestOutput | RequestOutput) -
     if isinstance(output, OmniRequestOutput):
         if output.multimodal_output is not None:
             yield from _image_values_from_mapping_like(output.multimodal_output)
-        if output.request_output is not None:
-            yield from _iter_request_output_payloads(output.request_output)
+        # OmniRequestOutput IS the RequestOutput now; iterate completion
+        # outputs directly for multimodal payloads that the property
+        # (which returns only the first match) may have missed.
+        for completion in getattr(output, "outputs", []):
+            mm = getattr(completion, "multimodal_output", None)
+            if mm is not None:
+                yield from _image_values_from_mapping_like(mm)
     else:
         yield from _iter_request_output_payloads(output)
 
diff --git a/vllm_omni/distributed/omni_connectors/utils/serialization.py b/vllm_omni/distributed/omni_connectors/utils/serialization.py
index 1166ede19..60fc725d6 100644
--- a/vllm_omni/distributed/omni_connectors/utils/serialization.py
+++ b/vllm_omni/distributed/omni_connectors/utils/serialization.py
@@ -2,7 +2,7 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 from collections.abc import Mapping
-from dataclasses import asdict, is_dataclass
+from dataclasses import asdict, fields, is_dataclass
 from typing import Any
 
 import msgspec
@@ -59,7 +59,10 @@ class OmniMsgpackEncoder:
         if isinstance(obj, Image.Image):
             return self._encode_pil_image(obj)
 
-        # RequestOutput (not a dataclass, needs special handling)
+        # RequestOutput (not a dataclass, needs special handling).
+        # Note: OmniRequestOutput subclasses RequestOutput but is a dataclass,
+        # so msgspec encodes it natively (field map) and it never reaches
+        # this hook.
         if isinstance(obj, RequestOutput):
             return self._encode_request_output(obj)
 
@@ -148,7 +151,6 @@ class OmniMsgpackEncoder:
             "encoder_prompt": obj.encoder_prompt,
             "encoder_prompt_token_ids": obj.encoder_prompt_token_ids,
             "num_cached_tokens": obj.num_cached_tokens,
-            "multi_modal_placeholders": getattr(obj, "multi_modal_placeholders", None),
             "kv_transfer_params": obj.kv_transfer_params,
         }
         # Handle multimodal_output attribute (MultimodalPayload or dict)
@@ -252,23 +254,27 @@ class OmniMsgpackDecoder:
     def _decode_omni_request_output(self, obj: dict[str, Any]) -> Any:
         """Decode dict to OmniRequestOutput.
 
-        OmniRequestOutput is a dataclass, so we can use msgspec.convert
-        or construct it directly.
+        By the time this runs, ``_post_process`` has already reconstructed
+        nested values bottom-up (CompletionOutput, tensors, images, ...), so
+        the object is built directly from the known dataclass fields.
         """
         from vllm_omni.outputs import OmniRequestOutput
 
+        data = dict(obj)
+        # Legacy wire format (pre-inheritance): the stage output was nested
+        # under "request_output". Merge its content into the new object.
+        legacy_inner = data.pop("request_output", None)
+        field_names = {f.name for f in fields(OmniRequestOutput)}
+        known = {k: v for k, v in data.items() if k in field_names}
         try:
-            # Use msgspec.convert for dataclass reconstruction
-            return msgspec.convert(obj, OmniRequestOutput)
+            out = OmniRequestOutput(**known)
         except Exception:
-            try:
-                # Fallback: construct directly if msgspec.convert fails
-                # (e.g., if some fields are missing or have wrong types)
-                return OmniRequestOutput(**obj)
-            except Exception:
-                # If both attempts fail, return dict as-is (defensive fallback)
-                # This should rarely happen if _is_omni_request_output is correct
-                return obj
+            # Defensive fallback; should rarely happen if
+            # _is_omni_request_output is correct.
+            return obj
+        if legacy_inner is not None and not isinstance(legacy_inner, dict):
+            out._copy_content_from(legacy_inner)
+        return out
 
     def _decode_tensor(self, obj: dict[str, Any]) -> torch.Tensor:
         """Decode dict to torch.Tensor."""
@@ -314,19 +320,16 @@ class OmniMsgpackDecoder:
         We construct it manually using only the known __init__ parameters to
         avoid triggering the "Ignoring extra arguments" warning in vllm.
         Fields that are not part of RequestOutput.__init__ (e.g.
-        multi_modal_placeholders, multimodal_output) are extracted first and
+        multimodal_output) are extracted first and
         then restored as dynamic attributes after construction.
         """
         # Extract dynamically-added / non-init fields before constructing so
         # they are not passed as unknown **kwargs to RequestOutput.__init__.
         mm_output = obj.pop("multimodal_output", None)
-        multi_modal_placeholders = obj.pop("multi_modal_placeholders", None)
 
         ro = RequestOutput(**obj)
 
         # Restore dynamic attributes that are not part of __init__.
-        if multi_modal_placeholders is not None:
-            setattr(ro, "multi_modal_placeholders", multi_modal_placeholders)
         if mm_output is not None:
             setattr(ro, "multimodal_output", mm_output)
         return ro
diff --git a/vllm_omni/engine/orchestrator.py b/vllm_omni/engine/orchestrator.py
index 5646e82eb..901bdb980 100644
--- a/vllm_omni/engine/orchestrator.py
+++ b/vllm_omni/engine/orchestrator.py
@@ -1633,12 +1633,12 @@ class Orchestrator:
         from vllm_omni.experimental.fullduplex.output import attach_duplex_output_decision
 
         engine_output = attach_duplex_output_decision(
-            OmniRequestOutput(
+            OmniRequestOutput.from_stage_output(
+                output,
                 request_id=req_id,
                 finished=True,
                 stage_id=stage_id,
                 final_output_type=decision.final_output_type,
-                request_output=output,
             ),
             decision,
         )
diff --git a/vllm_omni/entrypoints/omni_base.py b/vllm_omni/entrypoints/omni_base.py
index 587e0e73c..88e5a5edf 100644
--- a/vllm_omni/entrypoints/omni_base.py
+++ b/vllm_omni/entrypoints/omni_base.py
@@ -628,7 +628,6 @@ class OmniBase(PDDisaggregationMixin):
         self.prom_metrics.set_running(running)
         self.prom_metrics.set_waiting(max(0, total - running))
 
-        images = getattr(engine_outputs, "images", []) if output_type == "image" else []
         response_metrics: dict[str, Any] = {}
         stage_metrics: dict[str, dict[str, Any]] = {}
         rid_key = str(req_id)
@@ -653,19 +652,16 @@ class OmniBase(PDDisaggregationMixin):
                 response_metrics["final_output_type"] = current_stage_metrics["final_output_type"]
                 response_metrics["num_tokens_in"] = current_stage_metrics["num_tokens_in"]
                 response_metrics["num_tokens_out"] = current_stage_metrics["num_tokens_out"]
-        return OmniRequestOutput(
+        # Generation content (outputs, prompt, images, trajectory_*, ...) is
+        # copied from engine_outputs onto the returned object by
+        # OmniRequestOutput.from_stage_output().
+        return OmniRequestOutput.from_stage_output(
+            engine_outputs,
             request_id=req_id or "",
             finished=finished,
             stage_id=stage_id,
             replica_id=result.replica_id,
             final_output_type=output_type,
-            request_output=engine_outputs,
-            images=images,
-            trajectory_latents=getattr(engine_outputs, "trajectory_latents", None),
-            trajectory_timesteps=getattr(engine_outputs, "trajectory_timesteps", None),
-            trajectory_log_probs=getattr(engine_outputs, "trajectory_log_probs", None),
-            trajectory_decoded=getattr(engine_outputs, "trajectory_decoded", None),
-            _custom_output=getattr(engine_outputs, "_custom_output", {}),
             metrics=response_metrics,
             stage_durations=stage_durations,
             peak_memory_mb=peak_memory_mb,
diff --git a/vllm_omni/entrypoints/openai/api_server.py b/vllm_omni/entrypoints/openai/api_server.py
index 0ea0f3a3f..0a8daa055 100755
--- a/vllm_omni/entrypoints/openai/api_server.py
+++ b/vllm_omni/entrypoints/openai/api_server.py
@@ -2649,12 +2649,6 @@ def _extract_images_from_result(result: Any) -> list[Any]:
     images = []
     if hasattr(result, "images") and result.images:
         images = result.images
-    elif hasattr(result, "request_output"):
-        request_output = result.request_output
-        if isinstance(request_output, dict) and request_output.get("images"):
-            images = request_output["images"]
-        elif hasattr(request_output, "images") and request_output.images:
-            images = request_output.images
     # Handle when generate more than one image
     if images and isinstance(images[0], np.ndarray) and images[0].shape[0] > 1 and images[0].ndim == 5:
         # Unwrap batch: (N, T, H, W, C) -> [img1, img2, ...]
diff --git a/vllm_omni/entrypoints/openai/serving_audio_generate.py b/vllm_omni/entrypoints/openai/serving_audio_generate.py
index f8fedd33f..594b8c137 100644
--- a/vllm_omni/entrypoints/openai/serving_audio_generate.py
+++ b/vllm_omni/entrypoints/openai/serving_audio_generate.py
@@ -119,9 +119,6 @@ class OmniOpenAIServingAudioGenerate(OpenAIServing, AudioMixin):
             audio_output = None
             if hasattr(final_output, "multimodal_output") and final_output.multimodal_output:
                 audio_output = final_output.multimodal_output
-            if not audio_output and hasattr(final_output, "request_output"):
-                if final_output.request_output and hasattr(final_output.request_output, "multimodal_output"):
-                    audio_output = final_output.request_output.multimodal_output
 
             # Check for audio data using either "audio" or "model_outputs" key
             audio_key = None
diff --git a/vllm_omni/entrypoints/openai/serving_chat.py b/vllm_omni/entrypoints/openai/serving_chat.py
index ce019a970..423ca6d82 100755
--- a/vllm_omni/entrypoints/openai/serving_chat.py
+++ b/vllm_omni/entrypoints/openai/serving_chat.py
@@ -1468,7 +1468,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
         try:
             async for omni_res in result_generator:
                 final_output_type = omni_res.final_output_type
-                res = omni_res.request_output
+                res = omni_res
                 if final_output_type not in first_iteration_dict:
                     logger.warning(f"final output type: {final_output_type} is not needed by the request")
                     continue
@@ -2338,7 +2338,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
 
         for omni_outputs in final_outputs:
             choices_data = []
-            if omni_outputs.request_output is not None and not getattr(omni_outputs.request_output, "finished", False):
+            if not omni_outputs.finished:
                 continue
 
             # Filter outputs based on requested modalites
@@ -2347,7 +2347,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
                 continue
 
             if omni_outputs.final_output_type == "text":
-                if omni_outputs.request_output is not None:
+                if omni_outputs.stage_id is not None or omni_outputs.outputs:
                     (
                         choices_data,
                         usage,
@@ -2362,7 +2362,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
                         role,
                         reasoning_parser,
                     )
-                    final_res = omni_outputs.request_output
+                    final_res = omni_outputs
                 else:
                     # Diffusion pipeline text output (e.g. single-stage
                     # img2text / text2text) — no AR request_output, so build
@@ -2463,7 +2463,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
         role: str,
         reasoning_parser: ReasoningParser | None = None,
     ):
-        final_res = omni_outputs.request_output
+        final_res = omni_outputs
         if self.tool_call_id_type == "kimi_k2":
             history_tool_call_cnt = get_history_tool_calls_cnt(conversation)
         else:
@@ -2711,7 +2711,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
         self, omni_outputs: OmniRequestOutput, role: str, request: ChatCompletionRequest, stream: bool = False
     ) -> list[ChatCompletionResponseChoice] | list[ChatCompletionResponseStreamChoice] | ErrorResponse:
         choices: list[ChatCompletionResponseChoice] = []
-        final_res = omni_outputs.request_output
+        final_res = omni_outputs
         # OMNI: Access multimodal_output from CompletionOutput (outputs[0]), not from RequestOutput
         # Reference: examples/offline_inference/qwen3_omni/end2end.py line 421
         # The attribute is attached dynamically when stage audio arrives; fall
@@ -2834,7 +2834,6 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
         from PIL import Image
 
         choices: list[ChatCompletionResponseChoice] = []
-        final_res = omni_outputs.request_output
 
         # Handle profiling data
         stage_durations = omni_outputs.stage_durations
@@ -2846,10 +2845,11 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
         # First check omni_outputs.images directly (for diffusion mode via from_diffusion)
         if omni_outputs.images:
             images = omni_outputs.images
-        # Fall back to request_output for pipeline mode
-        # OMNI: Access multimodal_output from CompletionOutput (outputs[0]), not from RequestOutput
-        elif final_res is not None and final_res.outputs:
-            completion_output = final_res.outputs[0]
+        # Fall back to completion outputs for pipeline mode (multimodal_output
+        # is attached to CompletionOutput by AR stages).
+        elif omni_outputs.outputs:
+            completion_output = omni_outputs.outputs[0]
+            final_res = omni_outputs
             if hasattr(completion_output, "multimodal_output") and completion_output.multimodal_output:
                 image_data = completion_output.multimodal_output.get("image")
                 if image_data is not None:
@@ -3311,12 +3311,12 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
                 request_id=request_id,
             )
 
-        images = getattr(result.request_output, "images", [])
+        images = getattr(result, "images", [])
         stage_durations = result.stage_durations
         peak_memory_mb = result.peak_memory_mb
         cot_output = None
 
-        req_out = getattr(result, "request_output", None)
+        req_out = result
         if req_out:
             prompt_obj = getattr(req_out, "prompt", None)
             if isinstance(prompt_obj, dict):
@@ -3326,7 +3326,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
                     if isinstance(ar_text, str) and ar_text.strip():
                         cot_output = ar_text
 
-        req_out = getattr(result, "request_output", None)
+        req_out = result
         if req_out:
             prompt_obj = getattr(req_out, "prompt", None)
             if isinstance(prompt_obj, dict):
@@ -3336,7 +3336,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
                     if isinstance(ar_text, str) and ar_text.strip():
                         cot_output = ar_text
 
-        req_out = getattr(result, "request_output", None)
+        req_out = result
         if req_out:
             prompt_obj = getattr(req_out, "prompt", None)
             if isinstance(prompt_obj, dict):
@@ -3368,8 +3368,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
                 stage_id = getattr(output, "stage_id", None)
                 metrics = getattr(output, "metrics", None) if return_stage_metrics else None
                 if final_output_type == "text" and stage_id == 0:
-                    request_output = output.request_output
-                    for completion in request_output.outputs:
+                    for completion in output.outputs:
                         text = completion.text or ""
                         if not text:
                             continue
@@ -3382,7 +3381,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
                         )
                         yield f"data: {chunk.model_dump_json()}\n\n"
                 elif final_output_type == "image":
-                    images = self._flatten_diffusion_images(getattr(output.request_output, "images", []))
+                    images = self._flatten_diffusion_images(getattr(output, "images", []))
                     if not images:
                         raise RuntimeError("Streaming image edit produced an empty final image output.")
                     image_data = [
@@ -3686,8 +3685,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
 
             # Image output path (text2img / img2img)
             final_output_type = getattr(result, "final_output_type", "image")
-            # Handle nested OmniRequestOutput structure where images might be in request_output
-            images = getattr(result.request_output, "images", [])
+            images = getattr(result, "images", [])
             multimodal_output = getattr(result, "multimodal_output", {}) or {}
             stage_durations = result.stage_durations
             peak_memory_mb = result.peak_memory_mb
diff --git a/vllm_omni/entrypoints/openai/serving_speech.py b/vllm_omni/entrypoints/openai/serving_speech.py
index 88e7624f1..a662ae7de 100644
--- a/vllm_omni/entrypoints/openai/serving_speech.py
+++ b/vllm_omni/entrypoints/openai/serving_speech.py
@@ -2429,7 +2429,7 @@ class OmniOpenAIServingSpeech(OpenAIServing, AudioMixin):
         mm = getattr(res, "multimodal_output", None)
         ro = None
         if not mm:
-            ro = getattr(res, "request_output", None)
+            ro = res
             mm = getattr(ro, "multimodal_output", None) if ro else None
         if not mm:
             # MultimodalOutputProcessor attaches mm_accumulated on per-completion outputs.
diff --git a/vllm_omni/entrypoints/openai/serving_video.py b/vllm_omni/entrypoints/openai/serving_video.py
index 3a25283c8..9d511ba6d 100644
--- a/vllm_omni/entrypoints/openai/serving_video.py
+++ b/vllm_omni/entrypoints/openai/serving_video.py
@@ -505,16 +505,6 @@ class OmniOpenAIServingVideo:
         videos = None
         if hasattr(result, "images") and result.images:
             videos = result.images
-        elif hasattr(result, "request_output"):
-            request_output = result.request_output
-            if isinstance(request_output, dict) and request_output.get("images"):
-                videos = request_output["images"]
-            elif hasattr(request_output, "images") and request_output.images:
-                videos = request_output.images
-            else:
-                request_multimodal_output = getattr(request_output, "multimodal_output", None)
-                if isinstance(request_multimodal_output, Mapping):
-                    videos = request_multimodal_output.get("video")
         if videos is None:
             multimodal_output = getattr(result, "multimodal_output", None)
             if isinstance(multimodal_output, Mapping):
@@ -534,16 +524,6 @@ class OmniOpenAIServingVideo:
         multimodal_output = getattr(result, "multimodal_output", None)
         if isinstance(multimodal_output, Mapping):
             audio = multimodal_output.get("audio")
-        elif hasattr(result, "request_output"):
-            request_output = result.request_output
-            if isinstance(request_output, dict) and request_output.get("multimodal_output"):
-                mm_output = request_output.get("multimodal_output") or {}
-                if isinstance(mm_output, Mapping):
-                    audio = mm_output.get("audio")
-            else:
-                request_multimodal_output = getattr(request_output, "multimodal_output", None)
-                if isinstance(request_multimodal_output, Mapping):
-                    audio = request_multimodal_output.get("audio")
 
         if audio is None:
             return [None] * expected_count
@@ -599,7 +579,7 @@ class OmniOpenAIServingVideo:
         if isinstance(multimodal_output, Mapping):
             return dict(multimodal_output)
 
-        request_output = getattr(result, "request_output", None)
+        request_output = result
         if isinstance(request_output, dict):
             multimodal_output = request_output.get("multimodal_output")
             if multimodal_output is None:
@@ -716,7 +696,7 @@ class OmniOpenAIServingVideo:
                 except (TypeError, ValueError):
                     pass
 
-        request_output = getattr(result, "request_output", None)
+        request_output = result
         if isinstance(request_output, dict):
             mm = request_output.get("multimodal_output") or {}
             if isinstance(mm, Mapping):
@@ -755,7 +735,7 @@ class OmniOpenAIServingVideo:
             if sample_rate is not None:
                 return sample_rate
 
-        request_output = getattr(result, "request_output", None)
+        request_output = result
         if isinstance(request_output, dict):
             multimodal_output = request_output.get("multimodal_output") or {}
             if isinstance(multimodal_output, Mapping):
diff --git a/vllm_omni/entrypoints/openai/serving_video_output_stream.py b/vllm_omni/entrypoints/openai/serving_video_output_stream.py
index 1923028e4..770890faf 100644
--- a/vllm_omni/entrypoints/openai/serving_video_output_stream.py
+++ b/vllm_omni/entrypoints/openai/serving_video_output_stream.py
@@ -671,17 +671,8 @@ class OmniStreamingVideoOutputHandler:
         if result.images:
             # Video frames may be list[list[Image.Image]] despite images: list[Image.Image].
             videos = result.images  # type: ignore[assignment]
-        elif result.request_output is not None:
-            request_output = result.request_output
-            if isinstance(request_output, dict) and request_output.get("images"):
-                videos = request_output["images"]
-            elif isinstance(request_output, OmniRequestOutput):
-                if request_output.images:
-                    # Same nested-frames mismatch as result.images above.
-                    videos = request_output.images  # type: ignore[assignment]
-                else:
-                    request_multimodal_output = request_output.multimodal_output
-                    videos = request_multimodal_output.get("video")
+        # OmniRequestOutput IS the RequestOutput now — images and
+        # multimodal_output are checked directly on result.
         if videos is None:
             videos = result.multimodal_output.get("video")
 
diff --git a/vllm_omni/entrypoints/openai/video_stream_base.py b/vllm_omni/entrypoints/openai/video_stream_base.py
index 1694704f3..f975adbef 100644
--- a/vllm_omni/entrypoints/openai/video_stream_base.py
+++ b/vllm_omni/entrypoints/openai/video_stream_base.py
@@ -870,7 +870,7 @@ class OmniStreamingVideoHandler:
     @staticmethod
     def _get_audio_data(result: OmniRequestOutput):
         """Navigate OmniRequestOutput → multimodal_output['audio']. None on miss."""
-        request_output = getattr(result, "request_output", None)
+        request_output = result
         if request_output is None:
             return None
         outputs = getattr(request_output, "outputs", None)
@@ -1000,7 +1000,7 @@ class OmniStreamingVideoHandler:
         if result.final_output_type != "text":
             return "", previous_text
 
-        request_output = getattr(result, "request_output", None)
+        request_output = result
         if request_output is None:
             return "", previous_text
 
diff --git a/vllm_omni/outputs/__init__.py b/vllm_omni/outputs/__init__.py
index d0e41dbf0..105d0222d 100644
--- a/vllm_omni/outputs/__init__.py
+++ b/vllm_omni/outputs/__init__.py
@@ -3,7 +3,7 @@ from typing import Any
 
 import torch
 from PIL import Image
-from vllm.outputs import RequestOutput
+from vllm.outputs import CompletionOutput, RequestOutput
 from vllm.v1.outputs import ModelRunnerOutput
 
 from vllm_omni.inputs.data import OmniPromptType
@@ -71,12 +71,55 @@ class OmniModelRunnerOutput(ModelRunnerOutput):
         )
 
 
+# RequestOutput attributes that hold generation content.  When wrapping a
+# stage output, these are copied onto the OmniRequestOutput itself so that
+# the object IS the RequestOutput instead of holding one.
+_REQUEST_OUTPUT_CONTENT_ATTRS = (
+    "request_id",
+    "prompt",
+    "prompt_token_ids",
+    "prompt_logprobs",
+    "outputs",
+    "finished",
+    "lora_request",
+    "encoder_prompt",
+    "encoder_prompt_token_ids",
+    "num_cached_tokens",
+    "kv_transfer_params",
+)
+
+# Omni-specific content copied when the wrapped stage output is itself an
+# OmniRequestOutput (e.g. a diffusion stage inside a multi-stage pipeline).
+_OMNI_CONTENT_ATTRS = (
+    "images",
+    "latents",
+    "trajectory_latents",
+    "trajectory_timesteps",
+    "trajectory_log_probs",
+    "trajectory_decoded",
+    "_multimodal_output",
+    "_custom_output",
+)
+
+
 @dataclass
-class OmniRequestOutput:
+class OmniRequestOutput(RequestOutput):
     """Unified request output for both pipeline stages and diffusion models.
 
+    Extends vLLM's ``RequestOutput`` so that omni outputs can flow directly
+    through vLLM serving codepaths (which expect ``prompt_token_ids``,
+    ``outputs``, etc. as real attributes).  The inherited fields store the
+    LLM generation content; omni-specific fields store pipeline/diffusion
+    extras.
+
+    Note: ``RequestOutput`` is a plain class (not a dataclass), so all of its
+    attributes are redeclared below as dataclass fields with defaults — the
+    dataclass-generated ``__init__`` replaces ``RequestOutput.__init__`` and
+    must set them itself.
+
     This class handles outputs from:
-    1. Multi-stage LLM pipelines (with stage_id, final_output_type, request_output)
+    1. Multi-stage LLM pipelines (with stage_id, final_output_type, and the
+       inherited RequestOutput fields carrying the stage's generation content)
     2. Diffusion models (with images, prompt, metrics)
 
     Attributes:
@@ -85,31 +128,39 @@ class OmniRequestOutput:
         stage_id: Identifier of the stage that produced this output (pipeline mode)
         replica_id: Identifier of the stage replica that produced this output
         final_output_type: Type of output ("text", "image", "audio", "latents")
-        request_output: The underlying RequestOutput from the stage (pipeline mode)
         images: List of generated PIL images (diffusion mode)
-        prompt: The prompt used for generation (diffusion mode)
+        prompt: The prompt used for generation
         latents: Optional tensor of latent representations (diffusion mode)
-        metrics: Optional dictionary of generation metrics
+        metrics: Generation metrics. A plain dict for omni outputs; may carry
+            vLLM's request stats object when copied from a raw RequestOutput.
     """
 
+    # --- Inherited RequestOutput attributes (redeclared as fields) ---
     request_id: str = ""
+    prompt: OmniPromptType | None = None
+    prompt_token_ids: list[int] | None = None
+    prompt_logprobs: Any = None
+    outputs: list[CompletionOutput] = field(default_factory=list)
     finished: bool = True
+    metrics: Any = field(default_factory=dict)
+    lora_request: Any = None
+    encoder_prompt: str | None = None
+    encoder_prompt_token_ids: list[int] | None = None
+    num_cached_tokens: int | None = None
+    kv_transfer_params: dict[str, Any] | None = None
 
-    # Pipeline stage fields
+    # --- Pipeline stage fields ---
     stage_id: int | None = None
     replica_id: int | None = None
     final_output_type: str = "text"
-    request_output: RequestOutput | None = None
 
-    # Diffusion model fields
+    # --- Diffusion model fields ---
     images: list[Image.Image] = field(default_factory=list)
-    prompt: OmniPromptType | None = None
     latents: torch.Tensor | None = None
     trajectory_latents: torch.Tensor | None = None
     trajectory_timesteps: torch.Tensor | None = None
     trajectory_log_probs: torch.Tensor | None = None
     trajectory_decoded: list | None = None
-    metrics: dict[str, Any] = field(default_factory=dict)
     _multimodal_output: dict[str, Any] = field(default_factory=dict)
     _custom_output: dict[str, Any] = field(default_factory=dict)
 
@@ -124,6 +175,64 @@ class OmniRequestOutput:
     error_status_code: int | None = None
     error_type: str | None = None
 
+    def _copy_content_from(self, source: RequestOutput) -> None:
+        """Copy generation content from a stage output into this object.
+
+        *source* should be a vLLM ``RequestOutput`` or a subclass such as
+        ``OmniRequestOutput``.  Control fields (``stage_id``,
+        ``final_output_type``, ``stage_durations``, ``peak_memory_mb``,
+        ``error``, ...) are intentionally not copied.
+        """
+        # RequestOutput attributes — guaranteed on any RequestOutput.
+        # Only copy attributes that actually exist on the source, so that
+        # duck-typed mocks can omit optional fields without overwriting the
+        # dataclass defaults (e.g. ``outputs=[]``, ``finished=True``).
+        for name in _REQUEST_OUTPUT_CONTENT_ATTRS:
+            if hasattr(source, name):
+                setattr(self, name, getattr(source, name))
+
+        # Omni-specific fields — only present when the source is itself an
+        # OmniRequestOutput (e.g. a diffusion stage inside a pipeline).
+        if isinstance(source, OmniRequestOutput):
+            for name in _OMNI_CONTENT_ATTRS:
+                if hasattr(source, name):
+                    setattr(self, name, getattr(source, name))
+
+        # Propagate multimodal_output from duck-typed sources (e.g. test mocks
+        # that set multimodal_output directly on a non-OmniRequestOutput).
+        if not isinstance(source, OmniRequestOutput):
+            src_mm = getattr(source, "multimodal_output", None)
+            if src_mm:
+                self._multimodal_output = src_mm
+
+    @classmethod
+    def from_stage_output(cls, source: RequestOutput, **kwargs: Any) -> "OmniRequestOutput":
+        """Create an OmniRequestOutput from a stage's raw output.
+
+        Copies generation content (``outputs``, ``prompt``, ``prompt_token_ids``,
+        ``finished``, ``images``, ``latents``, etc.) from *source* onto the
+        returned object.  *source* may be a vLLM ``RequestOutput``, another
+        ``OmniRequestOutput`` (which inherits from ``RequestOutput``).
+
+        This is the **preferred** way to construct an ``OmniRequestOutput``
+        that wraps a stage result.
+
+        Args:
+            source: The stage output whose content is copied onto the new object.
+            **kwargs: Passed through to the dataclass constructor (``request_id``,
+                ``stage_id``, ``final_output_type``, ``metrics``,
+                ``stage_durations``, ``peak_memory_mb``, ``finished``, etc.).
+                Typed as ``Any`` because the exact set of valid keys is the
+                dataclass field list, which is validated by ``cls(**kwargs)``
+                at call time.
+
+        Returns:
+            A new ``OmniRequestOutput`` with the stage's content flattened onto it.
+        """
+        obj = cls(**kwargs)
+        obj._copy_content_from(source)
+        return obj
+
     @classmethod
     def from_error(
         cls,
@@ -150,33 +259,6 @@ class OmniRequestOutput:
             error_type=error_type,
         )
 
-    @classmethod
-    def from_pipeline(
-        cls,
-        stage_id: int,
-        final_output_type: str,
-        request_output: RequestOutput,
-        replica_id: int | None = None,
-    ) -> "OmniRequestOutput":
-        """Create output from pipeline stage.
-
-        Args:
-            stage_id: Stage identifier
-            final_output_type: Type of output
-            request_output: The stage's output
-
-        Returns:
-            OmniRequestOutput configured for pipeline mode
-        """
-        return cls(
-            request_id=getattr(request_output, "request_id", ""),
-            stage_id=stage_id,
-            replica_id=replica_id,
-            final_output_type=final_output_type,
-            request_output=request_output,
-            finished=True,
-        )
-
     @classmethod
     def from_diffusion(
         cls,
@@ -236,35 +318,21 @@ class OmniRequestOutput:
 
     @property
     def multimodal_output(self) -> Any:
-        """Return multimodal output from the underlying request output or local field.
+        """Return the multimodal output payload.
 
-        For pipeline outputs, this checks completion outputs first, then request_output.
-        For diffusion outputs, this returns the local _multimodal_output field.
+        Checks completion outputs first (where multimodal_output is attached
+        by AR stages), then the local _multimodal_output field.
 
         Returns either a MultimodalPayload (Phase 3+) or a plain dict (legacy).
         """
-        if self.request_output is None:
-            return self._multimodal_output
-
-        # Check completion outputs first (where multimodal_output is attached)
-        for output in getattr(self.request_output, "outputs", []):
+        for output in self.outputs:
             if mm := getattr(output, "multimodal_output", None):
                 return mm
-        if mm := getattr(self.request_output, "multimodal_output", None):
-            return mm
         return self._multimodal_output
 
     @property
     def custom_output(self) -> dict[str, Any]:
-        """Return custom output data from diffusion pipelines.
-
-        For diffusion outputs, returns the local _custom_output field.
-        For pipeline outputs with an inner OmniRequestOutput, forwards
-        the custom_output from the inner request output.
-        """
-        if self.request_output is not None:
-            if isinstance(self.request_output, OmniRequestOutput):
-                return self.request_output._custom_output
+        """Return custom output data from diffusion pipelines."""
         return self._custom_output
 
     @custom_output.setter
@@ -276,58 +344,6 @@ class OmniRequestOutput:
         """Return the number of generated images."""
         return len(self.images)
 
-    # Pass-through properties keep vLLM serving codepaths compatible with
-    # OmniRequestOutput for pipeline outputs (Issue #345).
-    @property
-    def prompt_token_ids(self) -> list[int] | None:
-        """Return prompt token IDs from the underlying request output.
-
-        This property is required for compatibility with vLLM's streaming
-        chat completion generator which checks res.prompt_token_ids.
-        """
-        if self.request_output is not None:
-            return getattr(self.request_output, "prompt_token_ids", None)
-        return None
-
-    @property
-    def outputs(self) -> list[Any]:
-        """Return outputs from the underlying request output.
-
-        This property is required for compatibility with vLLM's streaming
-        and non-streaming chat completion generators.
-        """
-        if self.request_output is not None:
-            return getattr(self.request_output, "outputs", [])
-        return []
-
-    @property
-    def encoder_prompt_token_ids(self) -> list[int] | None:
-        """Return encoder prompt token IDs from the underlying request output."""
-        if self.request_output is not None:
-            return getattr(self.request_output, "encoder_prompt_token_ids", None)
-        return None
-
-    @property
-    def prompt_logprobs(self) -> Any:
-        """Return prompt logprobs from the underlying request output."""
-        if self.request_output is not None:
-            return getattr(self.request_output, "prompt_logprobs", None)
-        return None
-
-    @property
-    def num_cached_tokens(self) -> int | None:
-        """Return number of cached tokens from the underlying request output."""
-        if self.request_output is not None:
-            return getattr(self.request_output, "num_cached_tokens", None)
-        return None
-
-    @property
-    def kv_transfer_params(self) -> Any:
-        """Return KV transfer params from the underlying request output."""
-        if self.request_output is not None:
-            return getattr(self.request_output, "kv_transfer_params", None)
-        return None
-
     @property
     def is_diffusion_output(self) -> bool:
         """Check if this is a diffusion model output."""
@@ -336,73 +352,7 @@ class OmniRequestOutput:
     @property
     def is_pipeline_output(self) -> bool:
         """Check if this is a pipeline stage output."""
-        return self.stage_id is not None and self.request_output is not None
-
-    def unwrap(self) -> "OmniRequestOutput":
-        """Unwrap nested OmniRequestOutput to get the innermost result.
-
-        This helper handles the common pattern where pipeline outputs may wrap
-        other OmniRequestOutput instances. It recursively unwraps until it reaches
-        the final output with actual content (images, text, etc.).
-
-        Returns:
-            The innermost OmniRequestOutput containing the actual generation results.
-
-        Example:
-            ```python
-            result = omni.generate(...)
-            output = OmniRequestOutput.unwrap_result(result)
-            if output.images:
-                # Access images directly
-                video_frames = output.images
-            ```
-        """
-        current = self
-        # Unwrap nested pipeline outputs
-        while current.is_pipeline_output and current.request_output is not None:
-            if isinstance(current.request_output, OmniRequestOutput):
-                current = current.request_output
-            else:
-                break
-        return current
-
-    @staticmethod
-    def unwrap_result(result: Any) -> "OmniRequestOutput":
-        """Unwrap result from omni.generate() to get the final OmniRequestOutput.
-
-        This static helper handles the full unwrapping pattern including:
-        1. Extracting from list if needed
-        2. Type validation
-        3. Recursive unwrapping of nested pipeline outputs
-
-        Args:
-            result: The result from omni.generate() - may be a list or OmniRequestOutput
-
-        Returns:
-            The innermost OmniRequestOutput with actual content
-
-        Raises:
-            ValueError: If result is not an OmniRequestOutput or list containing one
-
-        Example:
-            ```python
-            result = omni.generate(...)
-            output = OmniRequestOutput.unwrap_result(result)
-            # output is guaranteed to be the final OmniRequestOutput
-            ```
-        """
-        # Handle list wrapper
-        if isinstance(result, list):
-            if not result:
-                raise ValueError("Result list is empty")
-            result = result[0]
-
-        # Validate type
-        if not isinstance(result, OmniRequestOutput):
-            raise ValueError(f"Expected OmniRequestOutput, got {type(result)}")
-
-        # Unwrap nested outputs
-        return result.unwrap()
+        return self.stage_id is not None
 
     def to_dict(self) -> dict[str, Any]:
         """Convert to dictionary for JSON serialization."""
@@ -441,7 +391,8 @@ class OmniRequestOutput:
             f"finished={self.finished}",
             f"stage_id={self.stage_id}",
             f"final_output_type={self.final_output_type!r}",
-            f"request_output={self.request_output}",
+            f"prompt_token_ids={self.prompt_token_ids}",
+            f"outputs={self.outputs}",
             f"images={images_repr}",
             f"prompt={self.prompt!r}",
             f"latents={self.latents}",
diff --git a/vllm_omni/quantization/tools/compare_diffusion_trajectory_similarity.py b/vllm_omni/quantization/tools/compare_diffusion_trajectory_similarity.py
index 77b191738..4d5c69df5 100644
--- a/vllm_omni/quantization/tools/compare_diffusion_trajectory_similarity.py
+++ b/vllm_omni/quantization/tools/compare_diffusion_trajectory_similarity.py
@@ -259,17 +259,14 @@ def _extract_inner_output(outputs: Any) -> Any:
         if len(outputs) != 1:
             raise ValueError(f"Expected one request output, got {len(outputs)}.")
         outputs = outputs[0]
-    inner = getattr(outputs, "request_output", None)
+    inner = outputs
     if inner is not None:
         return inner
     return outputs
 
 
 def _request_peak_memory_mb(result: Any) -> float | None:
-    diffusion_output = getattr(result, "request_output", None)
-    peak_memory_mb = getattr(diffusion_output, "peak_memory_mb", None)
-    if peak_memory_mb is None:
-        peak_memory_mb = getattr(result, "peak_memory_mb", None)
+    peak_memory_mb = getattr(result, "peak_memory_mb", None)
     if peak_memory_mb is None:
         return None
     return float(peak_memory_mb)
diff --git a/vllm_omni/utils/audio.py b/vllm_omni/utils/audio.py
index bc2498efd..aafd0240b 100644
--- a/vllm_omni/utils/audio.py
+++ b/vllm_omni/utils/audio.py
@@ -79,7 +79,7 @@ def audio_chunk_pcm_bytes(omni_res: OmniRequestOutput) -> int:
     sample rather than recording a wrong byte count.
     """
     try:
-        final_res = omni_res.request_output
+        final_res = omni_res
         mm_output = final_res.outputs[0].multimodal_output
         audio_data = mm_output.get("audio")
         if isinstance(audio_data, list):
@@ -101,7 +101,7 @@ def audio_chunk_pcm_bytes(omni_res: OmniRequestOutput) -> int:
 def audio_chunk_sample_rate(omni_res: OmniRequestOutput) -> int:
     """Resolve audio sample rate for the request's audio stream."""
     try:
-        mm_output = omni_res.request_output.outputs[0].multimodal_output
+        mm_output = omni_res.outputs[0].multimodal_output
     except Exception:
         return _metric_defs.DEFAULT_AUDIO_SAMPLE_RATE
     return _metric_defs.resolve_audio_sample_rate(mm_output)