Claude Opus 4.7 Deanonymizes Journalist Kelsey Piper from 125 Words of Unpublished Writing
r/ClaudeAI·high signal
Journalist Kelsey Piper pasted 125 words of an unpublished political column into Claude Opus 4.7 and got her own name back. She verified via API, incognito mode, and a friend's separate computer — same result every time. The model identified her from unrelated genres: a student report, movie review, fiction, and college essay. Piper argues anyone who has written prolifically under their real name has lost meaningful anonymity. 413↑ on r/ClaudeAI.