whats-new-sonnet-5 changedabout-claude/models/whats-new-sonnet-5
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.
## 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
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