Marks will apply to output from supported Claude models across Claude Platform (API), Claude, Claude Code, Claude Cowork, and Claude Tag, and wherever Claude is offered, worldwide. In its Support page update this week, Anthropic went into detail about how the digital watermark will appear on AI-created content. An imperceptible digital watermark on AI-written text will be tricky but they seem to have sorted it out. This could carry a digital watermark on work that might have been 100% human generated. Citing Claude AI models that were released prior to the digital watermark process and/or text that has been heavily edited after it was generated using AI as ways to circumvent the watermark.