[Model] Add LTX-2.5 support (#6070)

Signed-off-by: lishunyang12 <lishunyang12@163.com>

tests/diffusion/cache/test_cache_dit.py

@@ -36,7 +36,6 @@ pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
 
 SEPARATE_CFG_TRANSFORMERS = [
     DreamIdOmniModel,
-    LTX2VideoTransformer3DModel,
     HeliosTransformer3DModel,
     LongCatImageTransformer2DModel,
     Cosmos3VFMTransformer,
@@ -124,6 +123,13 @@ def test_cache_dit_configs_have_separate_cfg(transformer_model):
     assert transformer_model._cache_dit_adapter_config.has_separate_cfg is True
 
 
+def test_ltx2_cache_dit_uses_one_forward_per_denoise_step():
+    """LTX batches all guidance passes into one Transformer invocation."""
+    adapter_config = LTX2VideoTransformer3DModel._cache_dit_adapter_config
+
+    assert adapter_config.has_separate_cfg is False
+
+
 @patch("vllm_omni.diffusion.cache.cachedit.model_specific.BlockAdapter")
 @patch("vllm_omni.diffusion.cache.cachedit.model_specific.cache_dit")
 def test_separate_wan22_custom_enabler_has_separate_cfg(mock_cache_dit, mock_block_adapter):