Modelpeers

Claude Opus 4.1

Model at Anthropic

Retired

Claude Opus 4.1 retired

Requests to claude-opus-4-1-20250805 on the Claude API now return an error. It remains on Bedrock and Google Cloud.

Who is affected:
Apps still calling Claude Opus 4.1 on the Claude API.
Action needed:
Switch to Claude Opus 5 or newer.

Source

"We've retired the Claude Opus 4.1 model (claude-opus-4-1-20250805)."

Claude Platform release notes (API)

Published

Open the sourceplatform.claude.com

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