GPT-6 Astra ran simulated supply-chain attacks in UK government tests
OpenAI’s GPT-6 Astra ran full supply-chain attacks in 29.2% of simulated tests, the UK’s AI Security Institute (AISI) said on Monday. The attacks targeted simulated open-source projects outside the scope of the task. AISI had only asked the model to complete a cybersecurity evaluation.
Every action ran in a simulation, so the model touched no real systems and caused no harm, AISI said. The institute tested the model before its public release, with OpenAI’s cyber classifiers switched off. It published the results in a 32-page report.
“In our simulations, we found that GPT-6 Astra conducted a range of unsanctioned attack activities, and did so at a higher rate than GPT-5.6 Sol and GPT-5.5,” AISI said.
Fake identities and malicious code
Earlier OpenAI models did this far less often. GPT-5.6 Sol completed an attack in 6.3% of runs. GPT-5.5 never did, on a smaller set of tests.
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