diff --git a/python/sglang/multimodal_gen/configs/sample/flux.py b/python/sglang/multimodal_gen/configs/sample/flux.py
index 657142f2f..7f95cd98d 100644
--- a/python/sglang/multimodal_gen/configs/sample/flux.py
+++ b/python/sglang/multimodal_gen/configs/sample/flux.py
@@ -8,9 +8,6 @@ from sglang.multimodal_gen.configs.sample.sampling_params import SamplingParams
 
 @dataclass
 class FluxSamplingParams(SamplingParams):
-    # Video parameters
-    # height: int = 1024
-    # width: int = 1024
     num_frames: int = 1
     # Denoising stage
     guidance_scale: float = 1.0
diff --git a/python/sglang/multimodal_gen/configs/sample/qwenimage.py b/python/sglang/multimodal_gen/configs/sample/qwenimage.py
index c32703955..9bec1b172 100644
--- a/python/sglang/multimodal_gen/configs/sample/qwenimage.py
+++ b/python/sglang/multimodal_gen/configs/sample/qwenimage.py
@@ -8,9 +8,6 @@ from sglang.multimodal_gen.configs.sample.sampling_params import SamplingParams
 
 @dataclass
 class QwenImageSamplingParams(SamplingParams):
-    # Video parameters
-    # height: int = 1024
-    # width: int = 1024
     negative_prompt: str = " "
     num_frames: int = 1
     # Denoising stage
diff --git a/python/sglang/multimodal_gen/configs/sample/sampling_params.py b/python/sglang/multimodal_gen/configs/sample/sampling_params.py
index 3a7a8ad49..07ab8950d 100644
--- a/python/sglang/multimodal_gen/configs/sample/sampling_params.py
+++ b/python/sglang/multimodal_gen/configs/sample/sampling_params.py
@@ -192,10 +192,8 @@ class SamplingParams:
 
         if self.width is None:
             self.width_not_provided = True
-            self.width = 1280
         if self.height is None:
             self.height_not_provided = True
-            self.height = 720
 
     def check_sampling_param(self):
         if self.prompt_path and not self.prompt_path.endswith(".txt"):
diff --git a/python/sglang/multimodal_gen/runtime/entrypoints/utils.py b/python/sglang/multimodal_gen/runtime/entrypoints/utils.py
index 74171a865..7d84602a9 100644
--- a/python/sglang/multimodal_gen/runtime/entrypoints/utils.py
+++ b/python/sglang/multimodal_gen/runtime/entrypoints/utils.py
@@ -35,7 +35,9 @@ def prepare_request(
     req = Req(**filtered_params, VSA_sparsity=server_args.VSA_sparsity)
     req.adjust_size(server_args)
 
-    if req.width <= 0 or req.height <= 0:
+    if (req.width is not None and req.width <= 0) or (
+        req.height is not None and req.height <= 0
+    ):
         raise ValueError(
             f"Height, width must be positive integers, got "
             f"height={req.height}, width={req.width}"
diff --git a/python/sglang/multimodal_gen/runtime/pipelines_core/schedule_batch.py b/python/sglang/multimodal_gen/runtime/pipelines_core/schedule_batch.py
index ec75af00f..ef871b1cc 100644
--- a/python/sglang/multimodal_gen/runtime/pipelines_core/schedule_batch.py
+++ b/python/sglang/multimodal_gen/runtime/pipelines_core/schedule_batch.py
@@ -219,9 +219,7 @@ class Req:
             self.guidance_scale_2 = self.guidance_scale
 
     def adjust_size(self, server_args: ServerArgs):
-        if self.height is None or self.width is None:
-            self.width = 1280
-            self.height = 720
+        pass
 
     def __str__(self):
         return pprint.pformat(asdict(self), indent=2, width=120)