Anthropic released Opus 5.5 on Tuesday, a new AI model that outperforms the larger Fable model on many benchmarks while costing significantly less—output tokens priced at $20 per million compared to $25 for the previous version. The release reflects CEO Dario Amodei's commitment to deliberately pacing AI capability advancement to match progress on alignment and safety.
Anthropic introduced Claude Opus 5.5, a new flagship model that matches Claude Fable 5.1 performance while costing 40% less to run. The model excels at complex coding tasks and achieves the strongest scores on Anthropic's alignment tests, with improved safety, faster output generation, and more natural communication.