What Anthropic has said about watermarking
12 August 2026
What Anthropic has published about its text watermark, the 2 August launch rule and the details it has not published.
Articles
Research notes from declawd. Each article gives the evidence and its limits, with links to the source material. No score here should be used to judge a person.
We scanned Claude output byte by byte
12 August 2026
We scanned 457,045 characters from four Claude model assignments and checked whether the collection route preserved hidden characters. The result covers one route and cannot test a word-choice watermark.
Punctuation is the wrong place to look
12 August 2026
We counted em dashes, curly quotation marks and apostrophes in Claude output and five nineteenth-century novels. In these files, punctuation points the wrong way.
We wrote the same article three ways
12 August 2026
One model assignment wrote the same article three times. Style rules and a checking pass altered five familiar patterns.