Claude 4.7 named a journalist from 125 words of unpublished writing

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Surprised this isn't a bigger topic but you tell me! In short: writer Kelsey Piper pasted 125 words of an unpublished political column into 4.7 and got her own name back. She'd logged out, run it via the API, retried it on a friend's laptop. Then swapped the genre entirely with unpublished prose unrelated to her usual space (a school progress report about her kid's Pokémon essays, a movie review of a 1942 wartime comedy). Claude named her every time, ChatGPT and Gemini guessed wrong. Her writeup

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