Anthropic to invisibly watermark all AI-generated text by Claude - How does it work?

American artificial intelligence company Anthropic is adding invisible watermarks to text generated by Claude , for users and third parties to identify whether the piece has been made by its AI models even after it has been copied and pasted elsewhere. Anthropic to invisibly watermark all AI-generated text by Claude The company explained that Claude models launched on or after August 2, 2026 will support machine-readable marking at launch. Any generated text will carry embedded watermarks, while supported generated files will contain digitally signed provenance metadata. Anthropic further revealed that this 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 Dario Amodei-led company added that the marking system will apply to supported Claude models across its products and services, including Claude, Claude Code, Claude Cowork, the API and Claude Tag, etc. However, this would not change the meaning, quality or readability of Claude's responses. Furthermore, the watermark is embedded directly into the generated text and is designed to be imperceptible to readers. The watermark being embedded in the text itself can travel with the text wherever copied and pasted and may survive some editing. The AI research company clarified that the watermarking happens at the model level, meaning it is not tied to a particular Claude product or interface. The system is separate from the provenance metadata that Anthropic plans to attach to supported files. For SVG, PNG and JPG formats, Claude will add digitally signed provenance metadata based on the Coalition for Content Provenance and Authenticity (C2PA) standard. This can indicate whether a file was processed by Claude and whether the metadata has been tampered with. However, the marking system is not designed to work as a definitive AI detector. Also read: Chhattisgarh launches 24x7 Smart PDS grain ATMs in Raipur, Durg and Bilaspur for eligible ration card holders