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[ARTICLE · art-161673] src=the-decoder.com ↗ pub= topic=ai-policy verified=true sentiment=· neutral

Anthropic's watermark rollout leaves a loophole on two older Claude models

Anthropic is expanding its text watermark to four more Claude models ahead of the EU AI Act's December deadline, but the rollout leaves a bypass on the older Claude Opus 4.6 and Sonnet 4.6, where developers can remove the watermark by tweaking a single sampling parameter. Anthropic addresses that loophole with only a compliance warning rather than a technical fix.

by read1 min views2 publishedOct 31, 2026

Anthropic is expanding its text watermark to four more Claude models to meet the EU AI Act's December deadline. On the older models Claude Opus 4.6 and Sonnet 4.6, developers can bypass the watermark by tweaking a single sampling parameter. Anthropic addresses the loophole with just a compliance warning.

The article Anthropic's watermark rollout leaves a loophole on two older Claude models appeared first on The Decoder.

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