Stephen Radochia / Android AuthorityTL;DR New Claude models launched from August 2 will embed invisible watermarks in generated text. Anthropic says existing Claude models will also gain marking support during the EU AI Act’s transition period. Anthropic is adding invisible watermarks to text generated by the latest Claude models, giving AI-written content a hidden signal that can follow it even after it’s copied out of the chatbot. The watermark is embedded directly into generated text and is designed to be imperceptible. Because the marking is applied at the model level, it will work across Claude, the Claude API, Claude Code, Claude Cowork, and Claude Tag, as well as supported cloud platforms.