Anthropic's Claude Sonnet 5.5 nearly matches Opus 5.5 on benchmarks while costing up to 30 percent less per task

Anthropic releases Claude Sonnet 5.5 with 30% speed and cost improvements ahead of planned IPO

Anthropic launched Claude Sonnet 5.5, the second model in its Claude 5.5 family, featuring 30% faster output generation and 30% lower per-task costs compared to its predecessor. The mid-tier AI model nearly matches the performance of the more expensive Opus 5.5 on knowledge-work benchmarks and includes enhanced cybersecurity safeguards, with the release coming as the company prepares for a planned initial public offering.