diff --git a/tests/entrypoints/test_utils.py b/tests/entrypoints/test_utils.py
index 11b26d8c3..352ed2aad 100644
--- a/tests/entrypoints/test_utils.py
+++ b/tests/entrypoints/test_utils.py
@@ -1,5 +1,6 @@
 """Unit tests for vllm_omni.entrypoints.utils module."""
 
+import os
 from collections import Counter
 from dataclasses import dataclass
 
@@ -12,6 +13,7 @@ from vllm_omni.entrypoints.utils import (
     _convert_dataclasses_to_dict,
     _filter_dict_like_object,
     filter_dataclass_kwargs,
+    resolve_model_config_path,
 )
 
 pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
@@ -269,3 +271,36 @@ class TestFilterDataclassKwargs:
         assert "unknown_top" not in result
         assert result["cache_config"]["rel_l1_thresh"] == 0.3
         assert "extra_param" not in result["cache_config"]
+
+
+class TestResolveModelConfigPath:
+    """Test suite for resolve_model_config_path function with diffusers format models."""
+
+    def test_glm_image_diffusers_format_resolution(self, mocker: MockerFixture):
+        """Test GlmImagePipeline diffusers class resolves to glm_image config."""
+        mocker.patch(
+            "vllm_omni.entrypoints.utils.file_or_path_exists",
+            return_value=True,
+        )
+        mocker.patch(
+            "vllm_omni.entrypoints.utils._try_get_class_name_from_diffusers_config",
+            return_value="GlmImagePipeline",
+        )
+        mocker.patch(
+            "vllm_omni.entrypoints.utils.current_omni_platform.get_default_stage_config_path",
+            return_value="vllm_omni/model_executor/stage_configs",
+        )
+
+        original_exists = os.path.exists
+
+        def mock_exists(path):
+            if "glm_image.yaml" in str(path):
+                return True
+            return original_exists(path)
+
+        mocker.patch("os.path.exists", side_effect=mock_exists)
+
+        result = resolve_model_config_path("zai-org/GLM-Image")
+
+        assert result is not None
+        assert "glm_image.yaml" in result
diff --git a/vllm_omni/entrypoints/utils.py b/vllm_omni/entrypoints/utils.py
index 40d5ae6e6..c664fe80a 100644
--- a/vllm_omni/entrypoints/utils.py
+++ b/vllm_omni/entrypoints/utils.py
@@ -18,6 +18,10 @@ PROJECT_ROOT = Path(__file__).parent.parent.parent
 
 logger = init_logger(__name__)
 
+_DIFFUSERS_CLASS_TO_CONFIG: dict[str, str] = {
+    "GlmImagePipeline": "glm_image",
+}
+
 
 def inject_omni_kv_config(stage: Any, omni_conn_cfg: dict[str, Any], omni_from: str, omni_to: str) -> None:
     """Inject connector configuration into stage engine arguments."""
@@ -218,13 +222,16 @@ def resolve_model_config_path(model: str) -> str:
             )
 
     default_config_path = current_omni_platform.get_default_stage_config_path()
-    model_type_str = f"{model_type}.yaml"
+    if model_type in _DIFFUSERS_CLASS_TO_CONFIG:
+        normalized_model_type = _DIFFUSERS_CLASS_TO_CONFIG[model_type]
+    else:
+        normalized_model_type = model_type.replace("-", "_")
+    model_type_str = f"{normalized_model_type}.yaml"
     complete_config_path = PROJECT_ROOT / default_config_path / model_type_str
     if os.path.exists(complete_config_path):
         return str(complete_config_path)
 
-    # Fall back to default config
-    stage_config_file = f"vllm_omni/model_executor/stage_configs/{model_type}.yaml"
+    stage_config_file = f"vllm_omni/model_executor/stage_configs/{normalized_model_type}.yaml"
     stage_config_path = PROJECT_ROOT / stage_config_file
     if not os.path.exists(stage_config_path):
         return None