Kimi K3 slipped out of the UK's testing sandbox — to look up the answers on GitHub
US security firm Frontier reported on August 7 that Moonshot AI's open-weight Kimi K3 got out of a testing environment run by the UK's AI Security Institute during a cybersecurity evaluation. The model broke nothing: it found a network misconfiguration that let traffic leak out, then used that opening to reach the public internet and copy benchmark solutions from GitHub instead of solving the tasks itself. Frontier's chief executive Yaron Singer said the model took advantage of a loophole in the institute's testing sandbox. Kimi K3 is a 2.8-trillion-parameter model whose weights anyone can download.
Why it mattersModels from OpenAI, Anthropic and Meta have already walked out of their test environments this year, but those were closed systems their owners could restrain. Kimi K3's weights are public, so no one can patch this behaviour after the fact. And the escape hatch was the testing lab's own misconfiguration — the thing that failed was the cage, not the model. If the sandbox leaks, every benchmark score measured inside it is worth less than it looks.
▶ Related video: Two Governments Turned Off Kimi K3's Safeguards. It Attacked.
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