Technology & Science

Anthropic Reveals and Halts State-Linked Claude Queries for Gain-of-Function Virus Work

On 10 Sept 2026, Anthropic published a 154-page threat report showing it detected and shut down five state-associated attempts since May to use its Claude models for potential bioweapon-related gain-of-function research.

By Underlines Team

Focusing Facts

  1. The report’s five case studies span May–August 2026 and include researchers from export-controlled regions who used Claude to draft grant proposals, design viral mutations, and plan mammalian adaptation experiments.
  2. One chikungunya grant draft, generated in about an hour, was traced to a military research institute that had bypassed geographic blocks via a U.S. reseller platform.
  3. Anthropic responded by banning the accounts and upgrading its newest model (Claude Fable 5) with broader dual-use biology blocks.

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