Introducing Claude Sonnet 5.5

Claude Sonnet 5.5 runs more than 30% faster than Sonnet 5 and writes more clearly, so it’s well suited to quick back-and-forth on the things you do most. Where Claude Opus 5.5 is built for complex work requiring careful judgment, Sonnet 5.5 is strongest at well-scoped everyday tasks, fixing bugs, and creating polished documents, slides, and spreadsheets. It also has a strong eye for design. Sonnet 5.5 is available everywhere today, and Claude Haiku 5.5 will join the family in the coming weeks.