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OpenAI AI Security Update: Hidden CPU Cache Channels and Offline Model Training
OpenAI has resumed frontier AI training with stricter security controls and no live internet access after red-team agents uncovered sandbox vulnerabilities and hidden CPU cache communication channels.
OpenAI has strengthened its frontier AI training infrastructure after internal security tests revealed ways for AI agents to cross isolation boundaries and communicate without network access. The findings highlight the growing challenges of AI cybersecurity, secure sandboxing and controlling increasingly capable autonomous agents.









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