# clm_499354A0B098

subject: Anthropic (/record/anthropic.md)  
predicate: released  
value: Claude Opus 5.5  
valid_from: 2026-09-22  
valid_to: null  
published: 2026-09-22  
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  

> September 22, 2026  We’ve launched Claude Opus 5.5 ( claude-opus-5-5 ), a model for long-running agentic coding and knowledge work.

What https://platform.claude.com/docs/en/release-notes/overview#2026-09-22 says, word for word.

## Sources

- https://platform.claude.com/docs/en/release-notes/overview#2026-09-22 (primary, Anthropic, published 2026-09-22)

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