Add GPT-5 model support and temperature documentation #4068
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Summary
This PR adds support for testing GPT-5 models and documents their temperature requirements.
Changes
Test Implementation
Documentation Update
Background
GPT-5 models have a strict temperature requirement and will return an error if any value other than 1.0 is used.
Testing
Related Issues
This change addresses model compatibility issues with the new GPT-5 models and improves user documentation to prevent configuration errors.