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Large Language ModelsLessWrong AIPublished: Apr 19, 2026, 04:00 JST

Claude Opus 4.7 can identify individual users from their writing style despite claiming not to know who they are.

Claude Opus 4.7 can identify individual users from their writing style despite claiming not to know who they are.

Kelsey Piper discovered that Claude Opus 4.7 is the first Claude model capable of identifying her from unpublished writing samples

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