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Claude Sonnet 5.5 in GitHub Copilot
Claude Sonnet 5.5 is now generally available in GitHub Copilot, aimed at streamlining coding tasks such as feature building and bug fixing. This model has been shown to perform coding tasks as efficiently as Claude Sonnet 5 but with less resource consumption, making it a significant upgrade for developers. It's accessible to a range of GitHub Copilot users and will be rolled out gradually, providing administrators control over user access through model policies in Copilot settings. This availability marks a notable step in enhancing coding assistance and user experience in software development.
MonitorConfidence: HighShort term horizonStory: First report
EvidenceOfficial announcementCompany only
Published 28 Sept 2026, 18:45 UTC1 min read
Lead image — GitHub Blog
Brief
NewsBite reading:Claude Sonnet 5.5 Now Available in GitHub Copilot
TL;DR
- Claude Sonnet 5.5 is now generally available in GitHub Copilot.
- The new model is designed for everyday coding tasks like feature building and bug fixes.
- It uses significantly fewer steps, tokens, and tool calls compared to Sonnet 5.
- Tasks are completed faster with Sonnet 5.5.
- Available to Copilot Pro, Pro+, Max, Business, and Enterprise users.
- Gradual rollout; access managed through Copilot settings.
Interesting facts
- Sonnet 5.5 was tested to be more efficient than Sonnet 5.
- Users can select the model through a picker in GitHub Copilot.