GitHub deprecated six models across most GitHub Copilot experiences on October 19, 2026, including Copilot Chat, inline edits, ask and agent modes, and code completions. The deprecations were announced on September 18, 2026. The announcement page carries a date without a time of day. Read the changelog entry.
Retired and replaced
| Retired model | Suggested alternative |
|---|---|
| Gemini 3.7 Flash | Gemini 3.8 Flash |
| GPT-5.5 | GPT-6.1 Sol |
| GPT-5.4 | GPT-6.1 Sol |
| GPT-5.4 mini | GPT-6 Luna |
| GPT-5 mini | GPT-6 Luna |
| Grok 4.5 | Grok 4.7 |
What to do
GitHub asks users to update workflows and integrations to supported models. Copilot Enterprise administrators may need to enable the alternative models through model policies in Copilot settings; once enabled, the models appear in the Copilot Chat model picker in VS Code and on github.com. No action is required to remove the deprecated models.
This batch is separate from the mid-November retirements announced on October 15, covered in our earlier report. Recent arrivals in Copilot are covered in our reports on Gemini 4 Argon and Claude Haiku 5.5.
