Anthropic Releases Claude Sonnet 5.5 With 30% Speed Boost and Lower Token Costs
Anthropic says its September 28 release is 30% faster than Sonnet 5 and uses tokens more slowly, while outperforming Opus 5.5 on agentic coding tasks. It also matches Opus 5’s cyber capabilities and receives the same safeguards as Fable and Opus.