Claude Opus 4.7 identified a writer from 125 words she’d never published
Kelsey Piper, a writer at Vox’s Future Perfect, pasted 125 words of an unpublished political column into Claude Opus 4.7 last week and got her own name back. She hadn’t logged in; the test was run in Incognito mode, confirmed through the API, and repeated on a friend’s computer. Same result each time.
The same model identifie…
