On December 14, 2026, six models disappear from GitHub Copilot. Not one at a time, not with a warning in the editor. All six, on the same day, across every Copilot experience: Chat, inline edits, ask and agent modes, and code completions.

GitHub posted the list on November 13. That gives you a month. Here's the full list, what replaces each one, and what to actually do before the date, because one of these replacements doesn't exist yet, and one of the models on the list has an exception that saves some of you.

What disappears, and what replaces it

Model going away Dec 14 replacement Notes

Claude Fable 5 Claude Fable 5.2 Straight upgrade

Claude Haiku 4.5 Claude Haiku 5.5 See the exception below

Gemini 3.8 Flash Gemini 4 Hydrogen The new default in Search and AI Mode

Gemini 4 Argon Gemini 4 Carbon Straight upgrade

Grok 4.6 Grok 4.7 Straight upgrade

Kimi K3 To be announced No replacement named yet

Read the first row carefully: it's Fable 5 going away, and Fable 5.2 is the replacement.…