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September 3, 2026

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Importance: important GitHub Tools and apps update ✓ official

GitHub recommends Claude Opus 5.5 following the retirement of Claude Opus 4.7

The recommended replacement for Claude Opus 4.7 in GitHub Copilot is Claude Opus 5.5; the original announcement listed Claude Opus 5. The retirement of four models takes effect on 2 October 2026 across all environments of the service.

New: The recommended replacement for Claude Opus 4.7 is Claude Opus 5.5, not Claude Opus 5.