GitHub Copilot drops GPT-5.5, GPT-5.4, Grok 4.5, and Gemini 3.7 Flash as of Oct 19
The six models, including GPT-5.4 mini and GPT-5 mini, are gone from Copilot Chat, inline edits, ask and agent modes, and completions; GitHub suggests GPT-6.1 Sol, GPT-6 Luna, Grok 4.7, or Gemini 3.8 Flash instead, which Enterprise admins may need to enable. Admins can now also read and change those model policies at the enterprise, team, app, and org level through new GA REST endpoints (changelog).
