Claude Sonnet 5.5

Anthropic released Claude Sonnet 5.5, officially claiming it is over 30% faster, cuts costs by up to 30% for most work, and matches Sonnet 5's pricing while beating it across benchmarks. The author tested its coding as approaching Opus 5.5 and notes it is now the model powering the free tier of claude.ai, making Anthropic's free offering stronger than ChatGPT's free tier, which uses Luna 5.6; the company reiterated Haiku 5.5 will launch in the coming weeks.