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Anthropic has begun embedding invisible watermarks into Claude's generated text so it can later identify AI-authored content. ML educator Sebastian Raschka published a detailed 48-minute video explainer breaking down how the underlying token-sampling mechanism works.

Anthropic published a blog post explaining the mechanics of its planned watermarking system for Claude, which uses Google DeepMind's SynthID-Text approach. The move is required under the EU AI Act's Transparency Code and has triggered user backlash on Reddit and X.

Anthropic confirmed it will watermark AI-generated text and files from Claude models, complying with the EU AI Act's Transparency Code that took effect August 2. The watermark is applied at the model level and persists through copy-paste, according to the company.