How Claude marks AI-generated content
Anthropic has committed to the EU AI Act's transparency requirements by implementing machine-readable watermarks and metadata for content generated by Claude. These features will be standard for new models starting in August 2026, with efforts underway to retroactively support existing models.
Why it matters
This move sets a precedent for how major AI labs will comply with global regulatory frameworks regarding AI transparency and content provenance.
Anthropic has signed the EU AI Act's Article 50(2) Code of Practice on Transparency of AI-Generated Content, as a provider of both generative AI models and generative AI systems. This article describes how we’re planning to put those commitments into practice, how marking works, and what its limitations are. We’ll update this article and publish more detailed technical guidance as it becomes available.
Anthropic’s commitments under the EU AI Act’s Code of Practice on Transparency of AI-Generated Content
What our marking commitments mean for Claude:
New models will mark AI-generated content from day one. Claude models launched in the EU on or after August 2, 2026 will support machine-readable marking at launch. Generated text will carry embedded watermarks, and generated files will include digitally signed provenance metadata where supported.
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