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Fix: Default tool_choice to "auto" for GPT-5 models to prevent API er… #70

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…rors

Fix server error for GPT-5 models when using unsupported tool_choice values

Some GPT-5 models currently only support tool_choice="auto". Sending other values (e.g., "required" or specific tool names) results in a 400 error: "Tool choices other than 'auto' are not supported with model".

This patch updates threads.py to automatically coerce unsupported tool_choice values to "auto" for GPT-5 models, preventing the error and ensuring consistent behavior.

Changes:

  • Added conditional check for GPT-5 model IDs.
  • Coerce or remove unsupported tool_choice values before sending the request.
  • Added warning log when coercion occurs.

This preserves backwards compatibility for other models and avoids runtime failures.

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…rors

Fix server error for GPT-5 models when using unsupported tool_choice values

Some GPT-5 models currently only support `tool_choice="auto"`.  
Sending other values (e.g., "required" or specific tool names) results in a
400 error: "Tool choices other than 'auto' are not supported with model".

This patch updates `threads.py` to automatically coerce unsupported
`tool_choice` values to `"auto"` for GPT-5 models, preventing the error and
ensuring consistent behavior.

Changes:
- Added conditional check for GPT-5 model IDs.
- Coerce or remove unsupported tool_choice values before sending the request.
- Added warning log when coercion occurs.

This preserves backwards compatibility for other models and avoids runtime failures.
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