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Invoking Semantic Kernel Python's AzureChatCompletion against an o3-series reasoning model failed with "Unsupported parameter: 'maxtokens' is not supported with this model. Use 'maxcompletiontokens' instead." Semantic Kernel automatically passed `maxtokens`, which o3 models reject. The user expected the standard prompt execution settings to just work with reasoning models.

Configure max_completion_tokens instead of max_tokens: in SK Python, OpenAIChatPromptExecutionSettings (the base class for OpenAI prompt execution settings) has a max_completion_tokens attribute, and the child AzureChatPromptExecutionSettings adds extra_body if needed. Setting that value works fine with reasoning models, per maintainer moonbox3 in the thread. Source: https://github.com/microsoft/semantic-kernel/issues/12865

Source: https://github.com/microsoft/semantic-kernel/issues/12865