ETH Zurich and Anthropic: LLMs Can Deanonymize Web Users for as Little as $2

A paper by ETH Zurich and Anthropic researchers demonstrates a fully autonomous LLM pipeline that deanonymizes pseudonymous web users by extracting identity signals and cross-referencing platforms, achieving 68% recall at a cost of roughly $2 per user, signaling the end of online anonymity at scale.

2026-09-25 ~ 2026-09-25 · 4 related posts

• ETH Zurich and Anthropic built an AI that unmasks anonymous accounts for $2, identifying 67% of HN users — NathanpmYoung · 2026-09-25
• LLMs enable at-scale deanonymization: up to 68% recall re-identifying HN and Reddit users — rickasaurus · 2026-09-25
• LLMs Can Deanonymize Pseudonymous Users for $1–$4 Each, USENIX Study Finds — RSync25 · 2026-09-25
• ETH Zurich and Anthropic built an AI that doxes anonymous accounts in a minute for $2 — skdh · 2026-09-25