# Claude Opus 5.5 Claude Opus 5.5 is Anthropic's current Opus model, built for long-running agentic coding and knowledge work. Anthropic recommends it as the starting point for most workloads. It costs 20% less per token than Claude Opus 5, and Anthropic says it gets the same work done with fewer tokens. Use it for complex, multi-step tasks: writing and reviewing code, planning and driving tools across long agentic runs, and research or analysis in fields like finance, law, medicine, and science. ## What it's good at - **Coding.** Writing, refactoring, and debugging code, and staying on track through long, hard tasks. - **Agents.** Plans ahead and works through multi-step tasks with little supervision. - **Reasoning.** Math, analysis, and specialized knowledge across technical and professional domains. - **Vision.** Accepts an image alongside your prompt for tasks like reading diagrams, transcribing text, and describing pictures. ## Thinking effort Opus 5.5 always
