Anthropic Confirms Text Watermarking to Comply with EU AI Act

burny_tech · x · 2026-08-16

A user illustrates how Claude's watermarking works: using a secret key and previous tokens to influence sampling choices, creating a statistically unlikely pattern without adding extra tokens. Citing Anthropic's official FAQ, the implementation is driven by EU AI Act compliance, with other major developers following suit. Anthropic claims the watermark has no practical impact on quality, is invisible to readers, and cannot be traced to specific individuals.

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