You Can Watermark the Words. But Can You Watermark the Meaning? — Claude and the AI Watermark Arms Race
Editorial image generated by the author. In August 2026, Anthropic announced and began rolling out machine-readable watermarks in text generated by supported Claude models. The mark is intended to preserve some trace of origin after the text leaves Claude: copy it into a document, paste it onto a website or edit it lightly, and the signal may still remain. The announcement came as Article 50 of the European Union's AI Act began applying new transparency obligations on 2 August 2026. Providers of AI systems that generate synthetic text, audio, images or video are required to make artificially generated or manipulated output machine-readable and detectable, using technical solutions that are effective, interoperable, robust and reliable as far as technically feasible. Systems placed on the market before 2 August receive a limited transition period for this marking obligation until 2 December 2026. The accompanying Code of Practice on Transparency of AI-generated Cont...