Anthropic is embedding "imperceptible" machine-readable watermarks directly into text generated by new Claude models, making copied AI output easier to trace as schools, publishers and other organizations grapple with undisclosed machine-written content.
Claude Watermarks Follow Text Across Platforms IPO-bound Anthropic on Monday said Claude models launched on or after Aug. 2 will support marking from launch.
The watermark "doesn’t change the meaning, quality, or readability" of Claude’s response, travels when users copy and paste text and "may persist through some editing." The marking applies worldwide across supported models used through Claude, Claude Code, Claude Cowork, Claude Tag and Anthropic’s API, as well as through AWS, Google Cloud and Microsoft Foundry.
Anthropic is also working to retrofit older models and plans detection tools for third parties.
The move follows Anthropic’s commitment to the European Union AI Act’s transparency framework.
