GitHub Copilot deprecates six models including GPT-5.5 and Grok 4.5

GitHub Copilot deprecated Gemini 3.7 Flash, GPT-5.5, GPT-5.4, GPT-5.4 mini, GPT-5 mini and Grok 4.5 on October 19, 2026, across most Copilot experiences, including Copilot Chat, inline edits, ask and agent modes, and code completions.

GitHub's changelog suggests Gemini 3.8 Flash, GPT-6.1 Sol, GPT-6 Luna and Grok 4.7 as replacements and tells users to update their workflows and integrations to supported models. Copilot Enterprise administrators may need to enable the alternative models through their model policies in Copilot settings. GitHub says no action is required to remove the deprecated models.