Anthropic Adds AI Watermarking to Claude Under EU Transparency Rules

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Anthropic has signed the EU AI Act's Article 50(2) Code of Practice on Transparency of AI-Generated Content, committing to machine-readable marking of AI-generated text. The transparency obligations took effect on August 2, 2026, with all Claude models released on or after that date shipping with marking capabilities built in. Two mechanisms are involved: an imperceptible statistical watermark embedded in generated text and provenance metadata for supported files. The watermark operates at the model level, meaning it applies across Claude's API, Claude Code, and third-party platforms such as AWS and Google Cloud. Anthropic has not yet published full technical details of the watermarking method, though the company says additional documentation is forthcoming.

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