Anthropic Explains How Claude’s Text Watermarking Works — and What It Can’t Do
Anthropic’s Aug. 15, 2026 post says Claude text watermarking uses Google DeepMind’s SynthID-Text, embedding an invisible pattern via word swaps like “overcast” vs “grey,” and doesn’t change output quality. It’s for EU AI Act Transparency Code compliance, with a planned detection API; light edits probably won’t remove it, but rewriting every word could—prompting mixed Reddit and X backlash.