Anthropic is expanding its text watermark to four more Claude models
Anthropic says it will watermark Claude Mythos 5, Claude Opus 4.7, Claude Opus 4.6 and Claude Sonnet 4.6, and points to the EU AI Act's December deadline as the reason. On Claude Opus 4.6 and Claude Sonnet 4.6, the watermark kicks in only at default settings, and a minor tweak to any one of temperature, top_p or top_k is enough to dodge it, according to The Decoder.
NoteFor anyone relying on the mark for compliance, Anthropic advises keeping the sampling settings at their defaults.
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