GitHub Copilot will deprecate six models on December 14

GitHub says it will deprecate six models across all Copilot experiences (Copilot Chat, inline edits, ask and agent modes, and code completions) on December 14, 2026. GitHub's suggested alternatives:

• Claude Fable 5 → Claude Fable 5.2
• Claude Haiku 4.5 → Claude Haiku 5.5
• Gemini 3.8 Flash → Gemini 4 Hydrogen
• Gemini 4 Argon → Gemini 4 Carbon
• Grok 4.6 → Grok 4.7
• Kimi K3 → to be announced

Exception. Claude Haiku 4.5 stays available to individual Copilot subscribers on annual plans.

Admin policy. Under default model enablement, the suggested alternatives are turned on automatically for Copilot Enterprise and Business unless an administrator has switched off the global default or disabled the model. Administrators who switched off the global default can enable the alternatives through model policies in Copilot settings. GitHub says no action is needed to remove the models once deprecated, and asks Enterprise customers with concerns to contact their account team.