Claude's Watermark Proves It Was Used, Not Who Wrote It

Anthropic's Claude AI now embeds invisible, machine-readable watermarks in all generated text globally, a move driven by the ...
The Next Web

Anthropic starts marking all of Claude’s output worldwide as EU transparency rules take effect

Anthropic has signed the EU AI Act’s Article 50(2) code and begun watermarking Claude’s output worldwide. What the transparency rules require, explained.
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Anthropic Explains the Mechanics of Claude’s Text Watermark

Anthropic published a detailed account on August 14, 2026 of how the text watermark in future Claude models works, identifying it as a version of the SynthID-Text technique Google DeepMind published ...