GitHub Copilot blog says several models will be deprecated on Dec. 14, 2026

According to the GitHub Copilot blog, GitHub will deprecate several models on Dec. 14, 2026 across Copilot Chat, inline edits, ask and agent modes, and code completions. The list includes Claude Fable 5, Claude Haiku 4.5, Gemini 3.8 Flash, Gemini 4 Argon, Grok 4.6 and Kimi K3. GitHub also listed suggested alternatives for each model. Claude Haiku 4.5 will remain available to individual GitHub Copilot subscribers on annual plans, and the deprecation does not apply to those customers.