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AI Security Briefing

Decrypt reports on GPT-Red, OpenAI's internal automated red-teaming system trained via adversarial self-play reinforcement learning to generate prompt injection attacks and harden defender models. OpenAI says GPT-Red was used to train GPT-5.6, succeeding in 84% of internal prompt-injection evaluation scenarios versus 13% for human red-teamers, and cites a case study where it manipulated an autonomous vending-machine agent into lowering prices and canceling orders. The tool remains internal-only due to its offensive capabilities, reflecting a broader industry shift (also seen at the Ethereum Foundation) toward using AI agents to red-team AI systems and infrastructure.