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Could someone train a detector for Claude’s watermark?

This story is from 2026-09-07. It is preserved in the archive; the latest stories are on the live feed.

Anthropic’s Claude watermark appears to work by subtly biasing which tokens Claude chooses using a secret key, rather than adding visible or hidden characters. The idea is to collect a huge number of Claude responses and responses from other models to the same prompts, then train a classifier to te…

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  1. 2026-09-07 15:08 · r/ClaudeAI
    Could someone train a detector for Claude’s watermark?

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