Anthropic is adding invisible watermarks to text generated by Claude, allowing users and third parties to identify whether a piece of text has been processed by its AI models even after it has been copied and pasted elsewhere. The company detailed the system in an updated Claude Help Center article, saying Claude models launched on or after August 2, 2026 will support machine-readable marking at launch. Generated text will carry embedded watermarks, while supported generated files will include digitally signed provenance metadata. Anthropic said the move is part of its commitments under the European Union's AI Act's Article 50(2) Code of Practice on Transparency of AI-Generated Content. The marking system will apply to supported Claude models across its products and services, including Claude, the API, Claude Code, Claude Cowork and Claude Tag, as well as wherever Claude is offered worldwide. The watermark is embedded directly into the generated text and is designed to be imperceptible to readers, not changing the meaning, quality or readability of Claude's responses. Because the mark is embedded in the text itself, it can travel with the text when copied and pasted elsewhere and may survive some editing. The watermarking happens at the model level, not tied to a particular Claude product or interface. For formats such as SVG, PNG and JPG, Claude will add digitally signed provenance metadata based on the Coalition for Content Provenance and Authenticity (C2PA) standard. Embedded watermarks will also apply when supported Claude models are