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LessWrong AIPublished: Apr 22, 2026, 01:00 JST

AI can now identify who you are from your writing style — Claude Opus 4.7 deanonymizes authors in seconds

AI can now identify who you are from your writing style — Claude Opus 4.7 deanonymizes authors in seconds

Anthropic's Claude Opus 4.7 can identify the author of anonymous text by analyzing writing style (word choice, sentence patterns, topics) — a task that three years ago required custom code and weeks of work. A researcher demonstrated this by feeding the AI a paragraph from an unpublished blog post and asking it to guess the writer's identity.

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Next articleAnthropic releases Claude 3.5 Opus, its most capable AI model yet