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Language model rankings / Claude Opus 4.8

Claude Opus 4.8

Anthropic

Marsel score: —
Licence: Proprietary
Context: —
Modalities: —

Released 2026-05-28

Measurements

Each figure is a measurement published by the named source on the named date. Where the source publishes its own page for this model, the date links to it so the figure can be checked at origin.

Metric	Value	Source	Measured	In score
ReasoningPerformance on the source’s reasoning evaluation set, on its own scale.	85.4	Epoch AI	2026-08-06 ↗	yes