Models · Anthropic

Claude Opus 4.8

Closed 2026-05-28

Lab: Anthropic
Released: 2026-05-28
Parameters: unknown
Context window: 1M
Input: text, image
Output: text
Weights: Closed
Official page: www.anthropic.com ↗

Benchmark scores

Humanity's Last Exam reasoning 46%

46% 2026-07-01 Anthropic releases Claude Opus 4.8 with adaptive reasoning and improved honesty

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