Anthropic Adds Claude Watermarks to Meet EU AI Act Rules
Anthropic will watermark Claude text and files under the EU AI Act, using model-level marks that survive copying, though editing resistance remains unclear.
Summary
In a support page update reported August 11, 2026, Anthropic said every model released after August 2 will automatically watermark generated text and files to comply with the EU AI Act’s Transparency Code, which took effect August 2. Files will use the open C2PA standard, while model-level text marks will follow copied and pasted output and may survive some editing across the Claude platform API, Claude, Claude Code, Claude Cowork, and Claude Tag. Anthropic plans support for older models but has not clarified how much editing removes a watermark; TechCrunch requested details.
The move comes as platforms respond to user backlash and regulatory scrutiny. Suno said last week it would mark tracks created on its AI music platform following legal challenges, while Substack partnered with Pangram last month to flag AI-generated content; Substack CEO Chris Best criticized “Claudefishing,” meaning people using AI to generate content. Black Forest Labs, Google, Meta, Microsoft, OpenAI, and Synthesia have also committed to the EU code.
Positives
- Every Anthropic model released after August 2 will automatically mark generated text and files.
- C2PA provides an open provenance standard for files produced by Anthropic models.
- Model-level text marks follow copied and pasted output across five listed Claude products and surfaces.
- Older Anthropic models are scheduled to receive watermark support.
- Black Forest Labs, Google, Meta, Microsoft, OpenAI, and Synthesia have joined Anthropic in committing to the EU code.
Risks & concerns
- Anthropic has not clarified how much editing is required to remove its text watermark.
- The support page says watermarks may survive some editing without establishing their resistance to substantial changes.
- Platforms are rushing to add watermarks amid user backlash and mounting regulatory scrutiny.
- Suno’s track-marking announcement followed a spate of legal challenges against the AI music platform.