How Claude marks AI-generated content
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Claude's AI content watermarking method, directly relevant to AI/ML development practices and highly actionable for engineers building with LLMs.
Anthropic commits to the EU AI Act's Code of Practice on Transparency, embedding imperceptible watermarks in Claude-generated text and attaching C2PA-signed provenance metadata to files like .svg, .png, and .jpg. These marks apply globally across all Claude surfaces (API, Claude Code, Claude Cowork) starting with models launched after August 2, 2026, with retroactive support for earlier models in progress. The watermarks survive copy-paste and light editing, while metadata follows the C2PA open standard for cross-industry content provenance.