diff --git a/src/agents/model_settings.py b/src/agents/model_settings.py
index 2b0885ab4..facbf8319 100644
--- a/src/agents/model_settings.py
+++ b/src/agents/model_settings.py
@@ -40,6 +40,9 @@ class ModelSettings:
     max_tokens: int | None = None
     """The maximum number of output tokens to generate."""
 
+    seed: int | None = None
+    """The random seed to use when calling the model."""
+
     store: bool | None = None
     """Whether to store the generated model response for later retrieval.
     Defaults to True if not provided."""
diff --git a/src/agents/models/openai_chatcompletions.py b/src/agents/models/openai_chatcompletions.py
index de7b1ae4f..a21d0fec3 100644
--- a/src/agents/models/openai_chatcompletions.py
+++ b/src/agents/models/openai_chatcompletions.py
@@ -536,6 +536,7 @@ async def _fetch_response(
             stream=stream,
             stream_options={"include_usage": True} if stream else NOT_GIVEN,
             store=store,
+            seed=self._non_null_or_not_given(model_settings.seed),
             extra_headers=_HEADERS,
         )
 
diff --git a/src/agents/models/openai_responses.py b/src/agents/models/openai_responses.py
index 17803fdac..f504c2164 100644
--- a/src/agents/models/openai_responses.py
+++ b/src/agents/models/openai_responses.py
@@ -246,8 +246,7 @@ async def _fetch_response(
             stream=stream,
             extra_headers=_HEADERS,
             text=response_format,
-            store=self._non_null_or_not_given(model_settings.store),
-        )
+            store=self._non_null_or_not_given(model_settings.store))
 
     def _get_client(self) -> AsyncOpenAI:
         if self._client is None: