# Anthropic implements Claude text watermarking to comply with EU AI Act

Watermarking adds no cost, tokens, or quality impact, and can't be traced to individuals.

- Other major model developers signed the same EU Code of Practice and will also implement watermarking
- Watermarked and un-watermarked text won't be distinguishable to readers
- Nothing is added to the text and there are no hidden characters

## Why it matters

Claude users get watermarked outputs with no visible change, added cost, or traceability to them.

## Sources

- [Anthropic: Anthropic implements Claude text watermarking to comply with EU AI Act](https://x.com/AnthropicAI/status/2088343978873966687)

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Summarized by dstilled on 2026-08-14. https://dstilled.ai/story/849986e4-b210-4c8d-bc21-50a90d2a74ef