Anthropic will add machine-readable watermarks to text generated by new Claude models starting August 2, 2026. Claude adds text watermarks Anthropic plans to embed an imperceptible signal directly into Claude-generated text. Supported output will carry the signal through the API, Claude, Claude Code, Claude Cowork, and Claude Tag. Cloud customers will also receive marked output when they access supported Claude models through major platforms. Files get digital provenance Claude will use a separate system for supported files, including common image formats.