feat: Add GPT-5 support; harden OpenAI client init, token handling, and response parsing#491

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phattailed wants to merge 4 commits intoOpenBMB:mainfrom

phattailed:main

Commits on Sep 24, 2025

fix: enhance robustness of OpenAI client initialization and token handling
Dave Belt
committed
feat: add support for GPT-5 model in token counting and limits
Dave Belt
committed
fix: improve OpenAI client initialization error handling and add client availability check
Dave Belt
committed
fix: enhance message handling in ChatAgent for OpenAI responses
Dave Belt
committed