Confirmed
Anthropic's text watermark leaves a bypass on Claude Opus 4.6 and Sonnet 4.6
Anthropic is extending its text watermark to four more Claude models ahead of the EU AI Act's December deadline. Developers can reportedly evade the watermark on the older Opus 4.6 and Sonnet 4.6 by changing one sampling parameter, and Anthropic has responded with only a compliance warning.
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The DecoderTech pressLead
Anthropic's watermark rollout leaves a loophole on two older Claude models