Claude now watermarks text from older models, with no opt-out

T2Covered by 1 source · first reported by Notebookcheck at 07 Nov, 14:00 UTC

Anthropic has been adding an invisible watermark to text from Claude Mythos 5, Opus 4.7 and Sonnet 4.6 since November 3. Opus 4.6, Opus 4.5, Sonnet 4.5 and Haiku 4.5 are set to follow on November 16. Customers cannot turn the mark off. Here is what it contains, who can check it and when it gets…