Validate chatcompletion to avoid unexpected bugs

Signed-off-by: Sambhav Kothari <[email protected]>

pydantic_ai_slim/pydantic_ai/models/openai.py

@@ -203,6 +203,8 @@ async def _completions_create(
     @staticmethod
     def _process_response(response: chat.ChatCompletion) -> ModelResponse:
         """Process a non-streamed response, and prepare a message to return."""
+        if not response.created:
+            raise UnexpectedModelBehavior('Response has no timestamp', body=response.to_json())
         timestamp = datetime.fromtimestamp(response.created, tz=timezone.utc)
         choice = response.choices[0]
         items: list[ModelResponsePart] = []

tests/models/test_openai.py

@@ -473,6 +473,15 @@ async def test_no_content(allow_model_requests: None):
             pass
 
 
+async def test_no_sync_content(allow_model_requests: None):
+    mock_client = MockOpenAI.create_mock(chat.ChatCompletion(id="", choices=[], created=0, model="", object="chat.completion"))
+    m = OpenAIModel('gpt-4', openai_client=mock_client)
+    agent = Agent(m, result_type=MyTypedDict)
+
+    with pytest.raises(UnexpectedModelBehavior, match='Response has no timestamp'):
+        await agent.run("")
+
+
 async def test_no_delta(allow_model_requests: None):
     stream = (
         chunk([]),