Claude Opus 5.5
Claude Opus 5.5 is the first model in Anthropic's Claude 5.5 family and its new flagship for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It performs at the level of Claude Fable 5.1 on most tasks while costing 40% less to run than Opus 5, and is particularly strong at multi-step changes in large codebases, code review and bug finding, and orchestrating complex agentic workflows.
With a 1M-token context window, Opus 5.5 maintains coherence across large codebases, long documents, and extended agentic sessions. It accepts text, image, and file inputs and applies deep reasoning to handle ambiguous, multi-step problems with minimal hand-holding.
Capabilities
How to use
- Type your question, complex task, or upload a document or image
- Claude Opus 5.5 applies deep reasoning to deliver thorough, accurate answers
- Refine and explore further with follow-up messages
Tip: Give context and say what format you want the answer in.
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