Anthropic: Claude Opus 5.5
anthropic/claude-opus-5.5
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...
Modalities
In / Out Price
$4 / $20 per 1M
Context
1M
Released
Sep 22, 2026
Knowledge Cutoff
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