Anthropic has published its most detailed account of Claude misuse, laying out how people tried to use its models for harm. The company said it detected and shut down these operations. They ran across cyberattacks, state surveillance, influence campaigns, conventional weapons work and biological research.
It set out the cases in a threat intelligence report released on 10 September. The report covers activity its Threat Intelligence team disrupted between December 2025 and August 2026.
The report spans seven harm areas. They are cyber operations, influence operations, surveillance, conventional weapons development, biological misuse, scams and fraud, and illicit distillation. Anthropic said the misuse involved its Claude Haiku, Sonnet and Opus models.
None of the cases involved its Fable or Mythos-class models, it added, with the exception of one distillation case. In each instance the company said it banned the accounts and strengthened its safeguards. It also shared intelligence with authorities and industry partners where appropriate.
Cheaper attacks, not new ones
