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.
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.
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