GitHub deprecated four models across its Copilot experiences on October 2, 2026, requiring affected users to update workflows and integrations to supported alternatives. The change spans Copilot Chat, inline edits, ask and agent modes, and code completions.
Models affected
Gemini 3.5 Flash and Gemini 3.6 Flash have been deprecated in favor of Gemini 3.8 Flash. GitHub also lists Kimi K3 as the alternative to Kimi K2.7 Code, and Claude Opus 5.5 as the alternative to Claude Opus 4.7.
Impact across Copilot
The deprecations apply across the named Copilot surfaces rather than a single editor or interaction mode. GitHub advises users to update any workflows and integrations that depend on the retired models.
Enterprise policy requirement
Copilot Enterprise administrators may need to enable the alternative models in Copilot model policies. GitHub says administrators can check individual Copilot settings to confirm that a policy is enabled for a particular model.
Where enabled models appear
Once an alternative model is enabled, GitHub says it will appear in the Copilot Chat model selector in VS Code and on GitHub.com. No action is required to remove the deprecated models.
Documentation and feedback
GitHub directs users to its model documentation for the current Copilot model list and invites feedback through the GitHub Community. Enterprise customers with questions can contact their account manager. Source: GitHub Changelog
Definition. GitHub Copilot model deprecations retire specified models across Copilot experiences and direct users to replacement models.
| Deprecated model | GitHub-listed alternative |
|---|---|
| Gemini 3.5 Flash | Gemini 3.8 Flash |
| Gemini 3.6 Flash | Gemini 3.8 Flash |
| Kimi K2.7 Code | Kimi K3 |
| Claude Opus 4.7 | Claude Opus 5.5 |
Key takeaways
- Gemini 3.5 Flash and Gemini 3.6 Flash are replaced by Gemini 3.8 Flash.
- Kimi K2.7 Code is replaced by Kimi K3.
- Claude Opus 4.7 is replaced by Claude Opus 5.5.
- The change affects Copilot Chat, inline edits, ask and agent modes, and code completions.
- Copilot Enterprise administrators may need to enable alternative models in model policies.
FAQ
Which Gemini models were deprecated in GitHub Copilot?
GitHub deprecated Gemini 3.5 Flash and Gemini 3.6 Flash, with Gemini 3.8 Flash listed as the alternative.
Where do enabled alternative models appear?
GitHub says enabled alternative models appear in the Copilot Chat model selector in VS Code and on GitHub.com.
Do deprecated Copilot models require removal action?
No. GitHub says no action is required to remove the deprecated models.
What should Copilot Enterprise administrators check?
They may need to enable alternative models in Copilot model policies and can check individual Copilot settings to confirm a policy is enabled for a model.
