GitHub completes six Copilot model retirements and adds policy APIs
GitHub removed Gemini 3.7 Flash, GPT-5.5, GPT-5.4, GPT-5.4 mini, GPT-5 mini and Grok 4.5 from most Copilot experiences on 19 October. It also made GET and PATCH model-policy endpoints generally available for enterprises, enterprise teams and apps, and organizations.
Why it matters: The migration deadline is now an operational fact, while the new policy APIs let administrators inventory and update replacement access programmatically instead of relying only on UI checks.