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…
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 lost.
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