Daring Fireball Slams Anthropic's Text Watermarking as Perversion of Writing

dbreunig · x · 2026-08-17

John Gruber of Daring Fireball published a scathing critique of Anthropic's text watermarking strategy. The article explains that Claude uses word choice manipulation during inference to embed fingerprints, arguing that this degrades the quality and readability of the text. Gruber calls Anthropic's claim that it 'doesn't change quality' absurd and labels the practice a 'perversion of writing', citing it as a reason why Claude has become such a terrible writer.

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