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A public announcement has been added for Claude Sonnet 5.5, which includes information on API availability, thinking parameter behavior changes, and compatibility warnings, corresponding to technical notes for the launch of the new model.
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Permanent link
https://daily.maas.click/item/obs_8b6acc99991635cc75062cdb7cc53727b5c73e2827723c5426f68fb9715faf13/Source page
https://docs.anthropic.com/en/release-notes/api ↗This link points to the source's official page (not content on this site).