Anthropic launches Claude Opus 5.5, matching Fable 5.1 at lower cost

anthropic launched claude opus 5.5, a new model that matches claude fable 5.1 performance on most tasks while costing 40% less to run. opus 5.5 is priced at $4 per million input tokens and $20 per million output tokens, down 20% from opus 5. anthropic reduced cache read costs by 60% and expects total operating costs to be 40% lower than opus 5. the model uses fewer tokens for high-quality results and generates output more than 30% faster. opus 5.5 also promises less 'claudish' writing, putting important information first, using less jargon, and following writing instructions more closely.