Claude Opus 5.5

anthropic/claude-opus-5-5

Claude Opus 5.5 is Anthropic's flagship reasoning model released in September 2026。

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Context window: 1M
Input: Image · Text
Output: Text
Released: 2026-09-22

Max output: 128K
Knowledge cutoff: 2026-06
Weights: Closed
Capabilities: Attachments, Reasoning, Tool call

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Performance

Overall capability

77.0/100

Coding: 82.7
Reasoning: 76.9
Professional work: 66.8
Knowledge & language: 67.9


Arena Agent Overall	Professional work	LMArena	2026-11-08
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AA-Briefcase	Professional work	Artificial Analysis	2026-11-05
SimpleQA Verified	Knowledge & language	Epoch AI	2026-11-05
ProgramBench	Coding	Vals AI	2026-11-05
GDPval-AA	Professional work	Artificial Analysis	2026-11-05
τ³-Banking	Professional work	Mercor	2026-11-05
CritPtClaude Opus 5.5 (Max, Default Fallback)	Reasoning	Artificial Analysis	2026-11-05

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ModelRegistry · Catalog updated 2026-11-10