Implement OpenAIResponsesModel.base_url property (#3281)

Co-authored-by: Douwe Maan <[email protected]>

Author: chasefarmer-pixee

pydantic_ai_slim/pydantic_ai/models/openai.py

@@ -948,6 +948,10 @@ def __init__(
 
         super().__init__(settings=settings, profile=profile or provider.model_profile)
 
+    @property
+    def base_url(self) -> str:
+        return str(self.client.base_url)
+
     @property
     def model_name(self) -> OpenAIModelName:
         """The model name."""

tests/models/test_openai_responses.py

@@ -78,6 +78,8 @@ def test_openai_responses_model(env: TestEnv):
     model = OpenAIResponsesModel('gpt-4o')
     assert model.model_name == 'gpt-4o'
     assert model.system == 'openai'
+    assert model.base_url == 'https://api.openai.com/v1/'
+    assert model.client.api_key == 'test'
 
 
 async def test_openai_responses_model_simple_response(allow_model_requests: None, openai_api_key: str):