# clm_758B7785187D

subject: Claude (/record/claude.md)  
predicate: discontinued  
value: Claude Opus 4.1  
valid_from: 2026-08-05  
valid_to: null  
published: 2026-08-05  
recorded: 2026-10-31  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-10-31  
checked: 2026-10-31 · its source page states the value and the date  

> We’ve retired the Claude Opus 4.1 model ( claude-opus-4-1-20250805 ). All requests to this model on the Claude API will now return an error.

What https://platform.claude.com/docs/en/release-notes/overview#2026-08-05 says, word for word.

## Sources

- https://platform.claude.com/docs/en/release-notes/overview#2026-08-05 (primary, Anthropic, published 2026-08-05)

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