Upcoming deprecation of Opus 4.6 (fast)
Quick Answer
GitHub will deprecate the Opus 4.6 (fast) model across all Copilot experiences, including Chat and code completions, effective June 29, 2026.
Quick Take
Users relying on this model should prepare for the transition to newer alternatives ahead of the deprecation date.
Key Points
- Opus 4.6 (fast) will be deprecated on June 29, 2026.
- Deprecation affects all GitHub Copilot experiences.
- Users should transition to newer models before the deadline.
- Includes Copilot Chat, inline edits, and code completions.
- Plan for changes to maintain productivity post-deprecation.
📖 Reader Mode
~1 min readWe will deprecate Opus 4.6 (fast) across all GitHub Copilot experiences (including Copilot Chat, inline edits, ask and agent modes, and code completions), on June 29th, 2026:
| Model | Deprecation date | Suggested alternative |
|---|---|---|
| Opus 4.6 (fast) | 6-29-2026 | Opus 4.8 (fast) |
Please update your workflows and integrations to use the supported model before these dates. Copilot Enterprise administrators may need to enable access to the alternative model through their model policies in Copilot settings. As an administrator, you can verify availability by checking your individual Copilot settings and confirming that the policy is enabled for the specific model. Once enabled, you’ll see the model in the Copilot Chat model selector in VS Code and on github.com. No action is required to remove the model once it has been deprecated.
GitHub Enterprise customers with questions or concerns are encouraged to reach out to their account manager for further assistance.
To learn more about the models available in Copilot, see our documentation on models and get started with Copilot today.
Join the GitHub Community to share your feedback.
— Originally published at github.blog
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