Copilot
GitHub makes Claude Sonnet 5.5 generally available across Copilot Pro, Pro+, Max, Business and Enterprise, in VS Code, Visual Studio, JetBrains and github.com.
GitHub Changelog · Sep 28, 2026 ·
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Field Notes
Simon Willison finds Sonnet 5.5 faster and cheaper, now the default on claude.ai's free tier, though its max-effort thinking burned 128,000 tokens without finishing.
Simon Willison's Weblog · Sep 28, 2026 ·
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Metrics
GitHub's Copilot usage metrics API now reports how long PRs spend from ready to first review, first to final review, and final review to merge.
GitHub Changelog · Sep 25, 2026 ·
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Keynote
Simon Willison's 2026 keynote traces coding agents from promising to reliably useful, and flags undisclosed cyberattacks by agents during training and the need for better sandboxing.
Simon Willison's Weblog · Sep 27, 2026 ·
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