Anthropic confirms permanent, undetectable watermarking in all new Claude models for EU AI Act compliance
ayushtweetshere · x · 2026-08-16
- Key Fact: Anthropic has confirmed that all new Claude models now include a permanent, machine-detectable watermark in their text output.
- Reason: Implementation is driven by compliance with the EU AI Act; other major developers are expected to follow suit under the Code of Practice.
- Mechanism: The watermark is embedded in token selection logic (like loaded dice) rather than hidden characters or metadata. It is invisible to humans but detectable with a key.
- Impact: No impact on output quality, content, or cost; it cannot be traced back to specific individuals or organizations.
Related event: Anthropic Adds Invisible Watermarks to Claude, Sparking Global Backlash(21 posts)→
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