Claude Opus 4.7 successfully identified tech writer Kelsey Piper as the author of unpublished 150-word writing samples each time it was tested; Semafor's Tom Chivers replicated the finding with a segment of his 2019 book.
Other AI models were less successful than Claude, and Claude could not identify people who lacked published real-name writing — though that limitation may change.
Anonymity may become difficult to maintain: someone posting a detailed anonymous review on a platform like Glassdoor could have the text identified by AI, revealing their identity to companies.
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