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

The DecoderIndependent reporting·
Corroborated event · 5 outlets

Anthropic filed to go public on the US stock market on 26 October, with a filing that runs nearly 70,000 words and lists numerous risk factors, including dangers AI poses to society. Reports say it is expected to receive a high "junk" rating from credit agencies following the IPO, and its text watermark rollout leaves a bypass loophole on two older Claude models.

AI brief

Anthropic is expanding its text watermark to four more Claude models ahead of the EU AI Act's December deadline. On the older Claude Opus 4.6 and Sonnet 4.6, developers can reportedly bypass the watermark by changing a single sampling parameter.

Why it matters: The watermark is meant to meet an EU compliance deadline, but on two models it can reportedly be bypassed with a minor parameter change.

Written by AI from The Decoder's published text.

Background

From our own funding, model and news trackers, not from the source.

More coverage of this story (6)

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Anthropic expected to receive high ‘junk’ rating from credit agencies following IPO, FT report says
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As Anthropic finally files for its IPO, rising risks aren’t slowing the AI buildout – yet
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The hidden threat in Anthropic’s prospectus: diseconomies of scale
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AI Business · 30 Oct 2026, 14:08
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Primary source

“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.”
The Decoder, 31 Oct 2026, 19:20.

Reporting from a publisher outside the organisation being covered.

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