Claude Opus 5.5

Anthropic has released Claude Opus 5.5, a new AI model that matches the performance of Claude Fable 5.1 while costing 40% less to operate than its predecessor Opus 5. The model demonstrates significant improvements in complex tasks like code migration and software optimization, achieves the best safety scores on automated behavioral audits, and generates output 30% faster than Opus 5. Access to the model for biology and cybersecurity research will be available through Anthropic's verification programs.