high90%
[langchain-openai] ChatOpenAI forwards unsupported sampling parameters to gpt-6-astra via Responses API
ChatOpenAI with use_responses_api=True sends temperature, top_p, and top_logprobs to the Responses API for gpt-6-astra, which does not support them, causing HTTP 400 errors. The issue is reproduced with langchain-openai==1.6.6.