Modelpeers

Claude Opus 4.1

Model at Anthropic

Retiring

Claude Opus 4.1 deprecated

Anthropic announced that claude-opus-4-1-20250805 would retire on the Claude API on August 5, 2026.

Who is affected:
Apps calling claude-opus-4-1-20250805.
Action needed:
Migrate to Claude Opus 4.8 or newer.

Source

"with retirement on the Claude API scheduled for August 5, 2026."

Claude Platform release notes (API)

Published

Open the sourceplatform.claude.com

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