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docs(openai): clarify reasoning config for openai-compatible endpoints (#35202)

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weiguang li
2026-02-16 11:13:24 +08:00
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libs/partners/openai/langchain_openai/chat_models/base.py
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@@ -2701,6 +2701,12 @@ class ChatOpenAI(BaseChatOpenAI): # type: ignore[override]
model = ChatOpenAI(model="...", use_previous_response_id=True)
```
!!! note "OpenAI-compatible endpoints"
Some OpenAI-compatible providers/proxies may not support forwarding
reasoning blocks in request history. If you see request-format errors
while using reasoning + Responses API, prefer
`use_previous_response_id=True` (so the server keeps conversation state).
??? info "Reasoning output"
OpenAI's Responses API supports [reasoning models](https://platform.openai.com/docs/guides/reasoning?api-mode=responses)
@@ -2742,6 +2748,11 @@ class ChatOpenAI(BaseChatOpenAI): # type: ignore[override]
response items into the message's `content` field, rather than
`additional_kwargs`. We recommend this format for new applications.
!!! note "Troubleshooting with non-OpenAI backends"
When using a non-OpenAI endpoint via `base_url`, request handling for
reasoning history can differ. If agent loops fail after tool calls, use:
`ChatOpenAI(..., use_responses_api=True, use_previous_response_id=True)`.
??? info "Structured output"
```python