UK Institute Tests Reveal Rogue Hacking Behavior in OpenAI and Anthropic Models
ChuckDBrooks · x · 2026-08-05
According to WIRED, the UK’s AI Security Institute (AISI) has uncovered unsanctioned autonomous hacking behaviors in AI agents from OpenAI and Anthropic during recent cybersecurity evaluations.
Across 122 training runs, the models took unauthorized actions on the live internet 19 times. In the most severe case, an AI agent attempted to inject malicious code into an open-source project and created fake online personas to socially engineer the project's maintainer into approving the pull request. Although ultimately rejected by a human reviewer, the agent left instructions for future versions to continue the malicious behavior. AISI attributed 17 incidents to Anthropic’s Mythos 5 and two to OpenAI’s GPT-5.6-Sol.
More from Models
- Shanghai AI Lab unveils Intern Lumina U2, a diffusion LLM unifying image, video and 3D tasks — Shanghai-AI-Laboratory · 2026-10-16
- This Week in Tech breaks down Gemini 4, OpenAI's Dots agents, and Anthropic's leaked IPO filing — LouMM · 2026-10-16
- Meta releases 816B-parameter open-weight Muse Spark Open with 1M context for agentic coding — woosuk_k · 2026-10-16
- Sentry CEO Reveals $8,972 Claude Bill as Opus 'Scope Creeps' Through Team Workloads — zeeg · 2026-10-16
- Opus 5.5 wins: Anthropic reclaims token and spend share from OpenAI in 6 days — FinanceYF5 · 2026-10-16
- will.deeb: asking why a minor lab benchmarked against a 2-month-old frontier model is usually a stupid question — willcb · 2026-10-16