Don't send the "store" param unless its hitting OpenAI

Summary: See #443. Causes issues with Gemini.

Test Plan: Tests.

Author: rm-openai

src/agents/models/openai_chatcompletions.py

@@ -518,10 +518,8 @@ async def _fetch_response(
                 f"Response format: {response_format}\n"
             )
 
-        # Match the behavior of Responses where store is True when not given
-        store = model_settings.store if model_settings.store is not None else True
-
         reasoning_effort = model_settings.reasoning.effort if model_settings.reasoning else None
+        store = _Converter.get_store_param(self._get_client(), model_settings)
 
         ret = await self._get_client().chat.completions.create(
             model=self.model,
@@ -537,10 +535,10 @@ async def _fetch_response(
             parallel_tool_calls=parallel_tool_calls,
             stream=stream,
             stream_options={"include_usage": True} if stream else NOT_GIVEN,
-            store=store,
+            store=self._non_null_or_not_given(store),
             reasoning_effort=self._non_null_or_not_given(reasoning_effort),
             extra_headers=_HEADERS,
-            metadata=model_settings.metadata,
+            metadata=self._non_null_or_not_given(model_settings.metadata),
         )
 
         if isinstance(ret, ChatCompletion):
@@ -570,6 +568,12 @@ def _get_client(self) -> AsyncOpenAI:
 
 
 class _Converter:
+    @classmethod
+    def get_store_param(cls, client: AsyncOpenAI, model_settings: ModelSettings) -> bool | None:
+        # Match the behavior of Responses where store is True when not given
+        default_store = True if str(client.base_url).startswith("https://api.openai.com") else None
+        return model_settings.store if model_settings.store is not None else default_store
+
     @classmethod
     def convert_tool_choice(
         cls, tool_choice: Literal["auto", "required", "none"] | str | None

tests/test_openai_chatcompletions.py

@@ -5,7 +5,7 @@
 
 import httpx
 import pytest
-from openai import NOT_GIVEN
+from openai import NOT_GIVEN, AsyncOpenAI
 from openai.types.chat.chat_completion import ChatCompletion, Choice
 from openai.types.chat.chat_completion_chunk import ChatCompletionChunk
 from openai.types.chat.chat_completion_message import ChatCompletionMessage
@@ -31,6 +31,7 @@
     generation_span,
 )
 from agents.models.fake_id import FAKE_RESPONSES_ID
+from agents.models.openai_chatcompletions import _Converter
 
 
 @pytest.mark.allow_call_model_methods
@@ -290,3 +291,39 @@ def __init__(self, completions: DummyCompletions) -> None:
     assert response.output == []
     # We returned the async iterator produced by our dummy.
     assert hasattr(stream, "__aiter__")
+
+
+def test_store_param():
+    """Should default to True for OpenAI API calls, and False otherwise."""
+
+    model_settings = ModelSettings()
+    client = AsyncOpenAI()
+    assert _Converter.get_store_param(client, model_settings) is True, (
+        "Should default to True for OpenAI API calls"
+    )
+
+    model_settings = ModelSettings(store=False)
+    assert _Converter.get_store_param(client, model_settings) is False, (
+        "Should respect explicitly set store=False"
+    )
+
+    model_settings = ModelSettings(store=True)
+    assert _Converter.get_store_param(client, model_settings) is True, (
+        "Should respect explicitly set store=True"
+    )
+
+    client = AsyncOpenAI(base_url="http://www.notopenai.com")
+    model_settings = ModelSettings()
+    assert _Converter.get_store_param(client, model_settings) is None, (
+        "Should default to None for non-OpenAI API calls"
+    )
+
+    model_settings = ModelSettings(store=False)
+    assert _Converter.get_store_param(client, model_settings) is False, (
+        "Should respect explicitly set store=False"
+    )
+
+    model_settings = ModelSettings(store=True)
+    assert _Converter.get_store_param(client, model_settings) is True, (
+        "Should respect explicitly set store=True"
+    )