Claude Sonnet 5.5 arrives in GitHub Copilot

Summary

GitHub announced that Claude Sonnet 5.5, Anthropic's newest Sonnet model, is now generally available in GitHub Copilot. In GitHub's early testing, the model matched Claude Sonnet 5 on coding tasks while using notably fewer steps, tokens, and tool calls, and finished tasks faster (company-reported figures). It is available to Copilot Pro, Pro+, Max, Business, and Enterprise users via the model picker, billed at provider list pricing under usage-based billing, with a gradual rollout. Anthropic had said Sonnet 5.5 would follow when it shipped Opus 5.5 on September 22.

Why it matters for our work

Developers gain an option to get similar coding quality at lower cost inside their everyday coding agent, which could speed up the habit of delegating routine builds and fixes to AI.

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