Anthropic Releases Claude Sonnet 5.5

Less than a week after the release of Claude Opus 5.5, Anthropic has delivered the second model in the Claude 5.5 family, Claude Sonnet 5.5.

“Sonnet 5.5 is a faster, lower-cost complement to Claude Opus 5.5,” Anthropic explains. “Where 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’s also got a sharp eye for design.”

Claude Sonnet 5.5 runs 30+ percent faster than its predecessor and costs up to 30 percent less for most work, Anthropic says. It’s the first Sonnet model to beat Pokémon Red working only from screenshots, an indication of its long-horizon work capabilities and image understanding, and it writes more clearly than previous-generation Anthropic models.

Sonnet 5.5 costs the same as Sonnet 5: $2 per million input tokens, $10 per million output tokens, and $0.20 per million tokens for cache reads, but Anthropic notes that it typically needs far fewer tokens to do the same work, explaining the 30 percent cost reduction overall.

Claude Sonnet 5.5 is now available on all platforms, including Amazon Web Services, Google Cloud, and Microsoft Azure. And Anthropic says it will round out the model family with Claude Haiku 5.5, which it says is built for high-volume and cost-sensitive applications, in the coming weeks.