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@xxdavid xxdavid commented Dec 15, 2025

GPT 5.1 also allows none, GPT 5.2 also allows xhigh.

Note that GPT 5.2 currently fails with ChatOpenAIResponses when using reasoning effort other than none:

%LangChain.LangChainError{
    type: nil,
    message: "Unsupported parameter: 'top_p' is not supported with this model.",
    original: nil
}

but I think that should be fixed in a separate commit/PR.

See: https://platform.openai.com/docs/guides/latest-model#gpt-5-2-parameter-compatibility

GPT 5.1 also allows `none`, GPT 5.2 also allows `xhigh`.

Note that GPT 5.2 currently fails with ChatOpenAIResponses when
using reasoning effort other than `none`:

    %LangChain.LangChainError{
        type: nil,
        message: "Unsupported parameter: 'top_p' is not supported with this model.",
        original: nil
    }

but I think that should be fixed in a separate commit/PR.

See: https://platform.openai.com/docs/guides/latest-model#gpt-5-2-parameter-compatibility
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