SNACK: 3-line summary
- GitHub retired six models across most GitHub Copilot experiences on October 19, 2026.
- Check workflows and integrations that specify a retired model and choose a supported alternative.
- Copilot Enterprise administrators may need to enable alternatives; retired models need no manual removal.
GitHub retired six models across most GitHub Copilot experiences on October 19, 2026. If a workflow or integration still specifies one of them, review that configuration and choose a supported alternative.
Snackgirls react
AIKO: I’d trace the model choice through each integration. A new name in the chat selector wouldn’t tell me what a separate workflow is set to use.
Red: I’d try a replacement on a small coding project first. I want to know whether it fits my rhythm before handing it the big stuff.
The six retired models and their suggested replacements
First announced on September 18, the retirements cover Copilot Chat, inline edits, ask and agent modes, and code completions. The announcement concerns support within Copilot, not the model providers ending their own APIs.
| 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 |
GitHub lists these as suggested alternatives. The table does not mean your workflows will switch automatically or that a replacement will produce identical results.
Enterprise access may need a policy change
Copilot Enterprise administrators may need to enable access to an alternative through model policies in Copilot settings. To check availability, review the individual Copilot settings and confirm that the policy is enabled for the specific model. Once enabled, the model appears in the Copilot Chat model selector in VS Code and on github.com.
No action is required to remove the retired models manually. That is separate from updating workflows and integrations to use supported models, so check both the configured model choice and any access policy that applies.
Sources and date: 2026-10-20
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