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Sweep 28 Aug 2026 ยท 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

One change

whats-new-sonnet-5

about-claude/models/whats-new-sonnet-5

first seen The page's own history The capture it came from

Nearest release: v2.1.242, published an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

about-claude/models/whats-new-sonnet-5 Page removed · 216 lines, page removed

## New model ## Behavior changes ### Adaptive thinking on by default ### Sampling parameters not accepted ### Manual extended thinking removed ## New tokenizer ## API constraints inherited from Claude Sonnet 4.6 ### Assistant message prefilling not supported ## Capability improvements ## Cybersecurity safeguards ## Pricing ## Availability ## Migration guide ## Next steps

The page is gone upstream. What it last said is kept here.