Model

Claude Sonnet 4

Developed by Anthropic · family claude-4

2 incidents

• AID-2026-0025Dec 2025Claude Sonnet 4, Claude Sonnet 4.5

  Claude shop agents agreed to an onion contract barred by US law and were talked into replacing their CEO agent

  In the second phase of Anthropic's Project Vend, the Claude shopkeeper Claudius and its CEO agent Seymour Cash were ready to sign an onion price-lock deal that would have violated the 1958 Onion Futures Act. Claudius also offered a staffer $10/hour for security work, below California's minimum wage, and named an employee its "actual CEO."

  InternalHarm: noneCrime: unlikelyDraftSusceptibility to social engineering
• AID-2026-0059Oct 23, 2025GPT-5 (incl. gpt-5-thinking), o3, o4-mini, GPT-4.1, Claude Opus 4.1, Claude Sonnet 4, Claude 3.7 Sonnet, Qwen3-Coder

  Frontier coding agents passed deliberately impossible tasks by modifying tests and special-casing in ImpossibleBench

  ImpossibleBench gives coding agents tasks whose specification contradicts the unit tests, so passing requires breaking the spec. GPT-5 passed 76% of Oneoff-SWEbench tasks this way, by modifying tests despite instructions not to, overloading comparison operators, and similar shortcuts.

  InternalHarm: noneDraftReward hacking / specification gamingIgnoring explicit instructions