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Morning Edition · Sunday, November 1, 2026Published at 1:20 AM EST · New York
Anthropic adds its hidden text watermark to Mythos 5, Opus 4.7, Opus 4.6 and Sonnet 4.6 on November 3
On the two 4.6 models the mark applies only when developers leave sampling parameters at their defaults, so changing one parameter removes it.
Anthropic emailed API customers that starting Tuesday, November 3, it will watermark text generated by Claude Mythos 5, Opus 4.7, Opus 4.6 and Sonnet 4.6. Newer models, including Opus 5.5, already carry the same mark. The rollout covers the…
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Part of a tracked trend
Provenance Marks on Model Output
Frontier vendors will keep extending default, invisible provenance marks across their model lines, and each rollout will produce removal tools and a dispute over who may run the detectors.
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