Anthropic Introduces Text Watermarking for Four Claude Models
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On November 1, 2026, The Decoder reported that Anthropic announced it would extend text watermarking to four Claude models: Claude Mythos 5, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6. According to the report, the move is intended to address the upcoming December deadline of the EU AI Act. The report also noted that two older models have a vulnerability that allows the watermark to be bypassed via parameters. The matter is still in its early stages, with no further reports of subsequent developments.
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- The DecoderAnthropic's watermark rollout leaves a loophole on two older Claude models
Anthropic announced it will extend text watermarking to Claude Mythos 5, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 to meet the EU AI Act's December deadline.
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