Every piece of text Claude generates from now on carries something you can’t see: an invisible marker proving where it came from. What Anthropic is actually doingAnthropic’s approach splits into two tracks, depending on what Claude produces. The text watermark is the more unusual piece of engineering here. Coverage extends across the board: Claude Platform (the API), the Claude consumer app, Claude Code, Claude Cowork, and Claude Tag all carry the same watermarking, since Anthropic applies it at the model level rather than per product. The competitive question shifts from “Does this company watermark its output?”