Upcoming deprecation of selected GitHub Copilot models in December

GitHub will deprecate six models across all GitHub Copilot experiences — Copilot Chat, inline edits, ask and agent modes, and code completions — on December 14, 2026: Claude Fable 5, Claude Haiku 4.5, Gemini 3.8 Flash, Gemini 4 Argon, Grok 4.6 and Kimi K3. GitHub directs users to update workflows and integrations to the suggested alternatives before that date, including Claude Fable 5.1, Claude Haiku 5.5, Gemini 4 Hydrogen, Gemini 4 Carbon and Grok 4.7; no replacement has been named for Kimi K3. Claude Haiku 4.5 remains available to individual Copilot subscribers on annual plans, and under default model enablement the alternatives are automatically enabled for Copilot Enterprise and Copilot Business customers unless an administrator has turned off the global default or explicitly disabled the model.

Upcoming deprecation of selected GitHub Copilot models in December We will deprecate the following models across all GitHub Copilot experiences including Copilot Chat, inline edits, ask and agent modes, and code completions on December 14, 2026: | Model | Deprecation date | Suggested alternative | |---|---|---| | Claude Fable 5 | 2026-12-14 | Claude Fable 5.1 | | Claude Haiku 4.5 | 2026-12-14 | Claude Haiku 5.5 | | Gemini 3.8 Flash | 2026-12-14 | Gemini 4 Hydrogen | | Gemini 4 Argon | 2026-12-14 | Gemini 4 Carbon | | Grok 4.6 | 2026-12-14 | Grok 4.7 | | Kimi K3 | 2026-12-14 | To be announced | Claude Haiku 4.5 will remain available to individual GitHub Copilot subscribers on annual plans. The deprecation of Claude Haiku 4.5 does not apply to these customers. Please update your workflows and integrations to use the supported models before this date. Under default model enablement, the suggested alternatives are automatically enabled for Copilot Enterprise and Copilot Business customers unless an administrator has turned off the global default or explicitly disabled the model. If you’ve turned off the global default, you can enable access to the alternative models through their model policies in Copilot settings. Once enabled, users will see the model in the Copilot Chat model selector in supported GitHub Copilot experiences. No action is required to remove the models after they have been deprecated. GitHub Enterprise customers with questions or concerns are encouraged to contact their account team for assistance. Share your feedback share-your-feedback To learn more about the models available in Copilot, see our documentation on supported models https://docs.github.com/copilot/reference/ai-models/supported-models?utm source=model-release-announcement&utm medium=changelog&utm campaign=newmodels . Join the GitHub Community https://github.com/orgs/community/discussions/categories/copilot-conversations?utm source=model-release-announcement&utm medium=changelog&utm campaign=newmodels to share your feedback.