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Claude Sonnet 5.5
release signals.

Track Claude Sonnet 5.5 releases, capability changes and related primary-source signals on SXF / AI.

1tracked signals
1primary sources
September 28, 2026latest tracked

LATEST DEVELOPMENT

Claude Sonnet 5.5 in GitHub Copilot

Claude Sonnet 5.5, Anthropic’s newest Sonnet model, is now generally available in GitHub Copilot. It is designed for well-scoped everyday work like building features and fixing bugs. In our early…

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MODEL TIMELINE

Recent Claude Sonnet 5.5 signals.

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GitHub

Claude Sonnet 5.5 in GitHub Copilot

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WHAT CHANGED

Claude Sonnet 5.5: what changed.

No post-baseline factual changes recorded for since 2026-09-27.

VERIFIED BASELINE2026-09-27Current facts remain aligned with the SXF ledger.