Description
Confirm this is an issue with the Python library and not an underlying OpenAI API
- This is an issue with the Python library
Describe the bug
previous_response_id works great however I encounter this error when swapping from reasoning -> non-reasoning models, presumably a common use-case.
I can't seem to find a way to list and clean out the reasoning steps in this scenario because reasoning isn't found in client.responses.input_items.list(). The only way I can think of is to manually handle the conversation like in Chat Completions but then that removes all of the benefits of the previous_response_id.
Ideally the backend would be smart enough to handle this and remove reasoning inputs when a non-reasoning model is selected. Alternatively having a function to clear these out on our end would help in the meantime.
I'm using Azure OpenAI.
OpenAI Version: 1.79.0
Azure API Version: 2025-04-01-preview
To Reproduce
response1 = await llm.responses.create(
input="what is a recursive python function?",
instructions="formatting re-enabled",
model="o4-mini",
reasoning={"effort": "medium", "summary": "detailed"},
)
print(response1)
response2 = await llm.responses.create(
input="hi",
previous_response_id=response1.id,
model="gpt-4.1",
)
print(response2)---------------------------------------------------------------------------
BadRequestError Traceback (most recent call last)
Cell In[44], line 8
1 response1 = await llm.responses.create(
2 input="what is a recursive python function?",
3 instructions="formatting re-enabled",
4 model="o4-mini",
5 reasoning={"effort": "medium", "summary": "detailed"},
6 )
7 print(response1)
----> 8 response2 = await llm.responses.create(
9 input="hi",
10 previous_response_id=response1.id,
11 model="gpt-4.1",
12 )
13 print(response2)
File c:\Users\user\repo\.venv\Lib\site-packages\openai\resources\responses\responses.py:1559, in AsyncResponses.create(self, input, model, include, instructions, max_output_tokens, metadata, parallel_tool_calls, previous_response_id, reasoning, service_tier, store, stream, temperature, text, tool_choice, tools, top_p, truncation, user, extra_headers, extra_query, extra_body, timeout)
1529 @required_args(["input", "model"], ["input", "model", "stream"])
1530 async def create(
1531 self,
(...) 1557 timeout: float | httpx.Timeout | None | NotGiven = NOT_GIVEN,
1558 ) -> Response | AsyncStream[ResponseStreamEvent]:
-> 1559 return await self._post(
1560 "/responses",
...
-> 1549 raise self._make_status_error_from_response(err.response) from None
1551 break
1553 assert response is not None, "could not resolve response (should never happen)"
BadRequestError: Error code: 400 - {'error': {'message': 'Reasoning input items can only be provided to a reasoning or computer use model. Remove reasoning items from your input and try again.', 'type': 'invalid_request_error', 'param': 'input', 'code': None}}Code snippets
OS
Windows 11
Python version
Python v3.13.2
Library version
openai v1.79.0