diff --git a/src/openai/types/responses/response_function_web_search.py b/src/openai/types/responses/response_function_web_search.py
index de6001e146..0a333f5d60 100644
--- a/src/openai/types/responses/response_function_web_search.py
+++ b/src/openai/types/responses/response_function_web_search.py
@@ -78,7 +78,7 @@ class ResponseFunctionWebSearch(BaseModel):
     id: str
     """The unique ID of the web search tool call."""
 
-    action: Action
+    action: Optional[Action] = None
     """
     An object describing the specific action taken in this web search call. Includes
     details on how the model used the web (search, open_page, find_in_page).