Claude Opus 4.8

anthropic/claude-opus-4-8

Top Claude Opus tier for the hardest reasoning, coding, and long-horizon agents

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Context window: 1M
Input: Document · Image · Text
Output: Text
Released: 2026-05-28

Max output: 128K
Knowledge cutoff: 2026-01
Weights: Closed
Capabilities: Attachments, Reasoning, Tool call

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Performance

Overall capability

58.2/100

Coding: 53.5
Reasoning: 59.9
Professional work: 57.9
Knowledge & language: 63.4


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IFBench（Artificial Analysis）Claude Opus 4.8 (Max)	Knowledge & language	Artificial Analysis	2026-11-05
Terminal-Bench 4.0 (Vals rerun)	Coding	Vals AI	2026-11-05
SciCodeClaude Opus 4.8 (Max)	Coding	Artificial Analysis	2026-11-05

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ModelRegistry · Catalog updated 2026-11-05