AI Signal 520
How Claude marks AI-generated content
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Anthropic committed to embedding machine-readable watermarks in Claude's text output and signed provenance metadata in generated files, starting with models launched on or after August 2, 2026, to comply with the EU AI Act's transparency code.
Developers integrating Claude's API will receive watermarked text by default, which could affect downstream content processing, storage, and redistribution systems. The marking applies worldwide regardless of deployment region, meaning all Claude users, not just those in the EU, will have their outputs tagged as potentially AI-generated.
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Claude models launched on or after August 2, 2026 will include embedded text watermarks and C2PA-compliant signed provenance metadata for supported file types at launch.
Marking applies across all Claude products and cloud partner platforms (AWS, Google Cloud, Microsoft Foundry) worldwide, not just in EU deployments.
Detected marks only indicate content 'may have been processed by Claude' and are not fully conclusive about provenance, since Claude is often used for editing rather than original generation.
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