Claude Opus 4.1 changelog

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.

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.