# clm_859670E7F8C6

subject: Claude (/record/claude.md)  
predicate: feature_added  
value: text watermark  
valid_from: 2026-11-03  
valid_to: null  
published: 2026-11-03  
recorded: 2026-11-05  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-06  
cite: AsOf. "Claude feature added: text watermark", as of 2026-11-03. Claim clm_859670E7F8C6, https://asof.is/claim/clm_859670E7F8C6, accessed 2026-11-09. Source: https://platform.claude.com/docs/en/release-notes/overview#2026-11-03.  
checked: 2026-11-06 · its source page states the value and the date  

> November 3, 2026  Text generated by Claude Mythos 5, Claude Opus 4.7, and Claude Sonnet 4.6 carries Anthropic’s text watermark on the platforms listed in How Claude marks AI-generated content .

What https://platform.claude.com/docs/en/release-notes/overview#2026-11-03 says, word for word.

## Sources

- https://platform.claude.com/docs/en/release-notes/overview#2026-11-03 (primary, Anthropic, published 2026-11-03)

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AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.