Gruber Challenges Anthropic's No-Impact Watermark Claim
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- Anthropic's text watermark works by altering word probabilities to embed a hidden fingerprint, according to Gruber's technical analysis.
- Gruber argues this probability-shifting approach could degrade Claude's writing, contradicting Anthropic's stated guarantee that quality remains unaffected.
Why it matters: If word-probability nudging alters every Claude response to embed a fingerprint, then any quality regression would surface in everyday outputs — putting Anthropic's 'no impact' guarantee to an informal user-facing test rather than a benchmark-only one.
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