ReleasedAug 5, 2025 · Aug 5, 2025

Claude Opus 4.1 is out

Anthropic shipped Claude Opus 4.1.

Anthropic released Claude Opus 4.1 on Aug 5, 2025.

It follows Claude Opus 4, 75 days earlier. Releases in the Claude Opus line usually land about 60 days apart.

Claude Opus 4.5 replaced it on Nov 24, 2025.

Released

Aug 5, 2025

Line

Claude Opus

Claude Opus 4 (May 22, 2025)

Confirmed by

Historical record

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