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Claude Opus 5.5

At a glance

Anthropic's new flagship for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.

1M ctx$4.00/$20.00 per M
Demos
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AI Output
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Benchmarks
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Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Reasoning & Knowledge
Graduate Science90.6%Factual Recall72.2%
Math
Competition Math100.0%
Agentic
Novel Reasoning92.5%
Specs
1M
Context
128K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$4.00/M tokens
Output$20.00/M tokens
Cache read$0.20/M tokens
Cache write$5.00/M tokens
Web search$0.01/search
Chat with Claude Opus 5.5Go to model