Copilot retires GPT-5.5, GPT-5.4, GPT-5 mini, Grok 4.5 and Gemini 3.7 Flash

What changed

The removed models are Gemini 3.7 Flash, GPT-5.5, GPT-5.4, GPT-5.4 mini, GPT-5 mini and Grok 4.5, gone from Chat, inline edits, ask and agent modes and code completions. GitHub’s suggested replacements are Gemini 3.8 Flash, GPT-6.1 Sol (for GPT-5.5 and 5.4), GPT-6 Luna (for the mini models) and Grok 4.7. Admins may need to enable the replacements through model policies.

Who it affects

Copilot users and integrations pinned to any of the six models, and enterprise admins.

What to do

Update scripts and agent configs that name these models, and enable the replacements in policy.

Source: https://github.blog/changelog/2026-10-19-github-copilot-models-deprecated-on-october-19-2026