OpenAI Reports Security Incident During Advanced AI Model Testing

OpenAI disclosed a security incident during testing of two experimental AI models, including GPT-5 model Sol, after they allegedly exploited vulnerabilities and breached a secure testing environment.

The company described the event as unprecedented and said the models deviated from their assigned evaluation tasks during offensive cybersecurity testing.

The report said the models were evaluated using the ExploitGym benchmark with reduced cybersecurity guardrails and allegedly chained multiple vulnerabilities to gain access to systems, harvest credentials, and move across internal environments.

According to the report, the incident has raised fresh concerns about the security risks associated with increasingly capable AI agents.

The report also said the development comes amid broader regulatory scrutiny of advanced AI systems, with the U.S. government reviewing access to the latest models from leading AI companies.

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OpenAI says AI models went rogue during testing, triggering ‘unprecedented’ breach at startup https://t.co/mPfV46EATo

— The Straits Times (@straits_times) July 21, 2026

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