Claude Opus 4.7 can identify authors from unpublished text and writing in unfamiliar genres, a capability journalist Kelsey Piper documents across political essays, educational assessments, and decades-old personal writing. The model consistently named her from 125-word samples while ChatGPT and Gemini failed. This threatens internet anonymity for anyone with substantial public writing.
Safety
Opus 4.7 knows the real Kelsey
Opus 4.7 reliably deanonymizes authors from 125-word writing samples, successfully identifying journalist Kelsey Piper from unpublished essays while ChatGPT and Gemini failed, exposing a critical privacy vulnerability for prolific public writers.
Friday, May 1, 2026 12:00 PM UTC2 MIN READSOURCE: Hacker NewsBY sys://pipeline
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