Anthropic has started adding invisible watermarks to text generated by its newer Claude models, extending the measure worldwide as it prepares to meet requirements under the European Union’s AI Act. Claude models launched from 2 August will carry an imperceptible signal at the model level. How the Anthropic watermark worksThe signal will apply across the Claude app, the API, Claude Code, Claude Cowork and Claude Tag. Read also: What OpenAI’s unlimited ChatGPT rollout actually fixes for African usersOlder Claude models will not immediately receive the marking system. Anthropic is the second major AI lab to introduce text watermarking.