As part of its requirements to comply with European Union regulations, Anthropic announced that its Claude models will carry identity markings in order to enable the labelling of AI content.
Anthropic has signed the EU AI Act’s Article 50(2) Code of Practice on Transparency of AI-Generated Content, meaning that Claude models launched in the EU on or after August 2 will support machine-readable markings at the time of launch.
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“Generated text will carry embedded watermarks, and generated files will include digitally signed provenance metadata where supported,” stated Anthropic in the blog post.
Of particular interest is how Anthropic will watermark AI-generated text content, which is usually easier to pass off as being human generated, than an AI photo or a piece of art.
Anthropic stated this would be done through an “imperceptible watermark” that cannot be seen by the reader.
The watermark will also move with text even if it is copied, pasted elsewhere, and lightly edited.
Anthropic further noted that when Claude generates a supported file type (.svg, .png, or .jpg), signed provenance metadata will be attached.
However, there are some limitations to keep in mind.
Anthropic warned that even if Claude’s mark was detected, that may not mean Claude was 100% the original author of the content; it could mean that human-generated content was processed with AI.
The company also warned about false negatives due to excessive editing, short text lengths, or stripped metadata.
These marks will apply to output from supported Claude models across Claude Platform (API), Claude, Claude Code, Claude Cowork, and Claude Tag, globally, though not all platforms/features may support all marking types.
Anthropic confirmed that the embedded watermarks would apply even when the supported Claude models are accessed through AWS, Google Cloud, or Microsoft Foundry.
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AI industry | Explained Anthropic is set to share more information about how it will support users and other third parties to detect Claude’s marks.
“As AI-generated content becomes commonplace, greater transparency and signals about where content comes from can give people useful context about the information they consume.
To support transparency and comply with our legal obligations, Anthropic is working to include machine-readable marks in content that Claude generates,” stated Anthropic in its blog post.
