Capability gains

UK and US evaluators find Kimi K3 can autonomously attack a simulated enterprise

A joint AISI and CAISI assessment found Kimi K3 below leading US cyber models but able to complete a 32-step simulated corporate-network attack in one of ten attempts, with safeguards that did not prevent offensive operations.

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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM53confidence 86/100

Why it moved the index

Two government evaluation bodies report a concrete autonomous solve of a simulated enterprise attack and ineffective offensive-cyber refusals. The assessment also shows material limits: Kimi K3 trails frontier closed models, solved only one of ten runs, and was tested in an intentionally vulnerable environment without active defenders.

AUDIT TRAIL

Assessment history

  1. R1
    Toward 53 · confidence 86

    New historical independent government evaluation of a named model with practical autonomous cyber evidence.

    11 Aug 2026
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  1. DoomBench assesses “UK and US evaluators find Kimi K3 can autonomously attack a simulated enterprise” as evidence moving toward doom, with magnitude 53 and confidence 86 out of 100 in the capability gains category.

  2. The DoomBench assessment of “UK and US evaluators find Kimi K3 can autonomously attack a simulated enterprise” is based on reporting from UK AI Security Institute and records the editorial rationale, source quality, attribution, and...

  3. DoomBench summarizes “UK and US evaluators find Kimi K3 can autonomously attack a simulated enterprise” as follows: A joint AISI and CAISI assessment found Kimi K3 below leading US cyber models but able to complete a 32-step simulated...

    https://www.doombench.com/news/uk-and-us-evaluators-find-kimi-k3-can-autonomously-attack-a-simulated-enterprise-2026-07-23