In response to upcoming European Union AI Act transparency requirements, Anthropic has released detailed documentation explaining how invisible watermarking will be embedded into text generated by Claude models. The system introduces subtle statistical patterns into token selection probabilities.
Importantly, Anthropic claims the watermarking algorithm produces zero measurable impact on intelligence, reasoning, or code generation syntax. Authorized detection tools can verify whether text was generated by Claude with over 99.9% statistical confidence.
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However, security researchers remain split on robustness, pointing out that multi-stage rewriting or heavy paraphrasing by secondary LLMs can diminish watermark detection confidence scores.