AI Watermarks Are Here, But They Don’t Prove Who Wrote the Text
Within 48 hours at the turn of August, both major AI labs switched on watermarking. On July 31, OpenAI embedded SynthID marks into all GPT-Live voice output — one day before Article 50 of the EU AI Act came into force. From August 2, Anthropic began weaving an imperceptible watermark into everything Claude writes.
My first thought was that this is very hard to do in a way that actually holds. Text has no pixel layer to hide anything in. So I read how Anthropic plans to do it — and dug into how text watermarks work in general. The honest answer: it works, and it also breaks in a lot of ordinary situations.
How do you even hide a mark in plain text?
There are three generations of this idea. (A good breakdown of the mechanics went viral this week in a thread by ML engineer Daria Berezhnaia—...
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