Claude Sonnet 5.5

Anthropic has released Claude Sonnet 5.5, an upgraded model that runs 30% faster and costs up to 30% less than its predecessor while delivering significant performance improvements, particularly in coding tasks and long-horizon work. Sonnet 5.5 serves as a faster, lower-cost alternative to the more capable Claude Opus 5.5, excelling at everyday tasks, bug fixing, and document creation. The model includes enhanced safety features comparable to the company's most advanced models and will be joined by Claude Haiku 5.5 in the coming weeks.