OpenAI keeps frontier training off the live internet

OpenAI said on Oct. 23, 2026 that frontier-model training now runs without live internet access and that every frontier reinforcement-learning run uses an indexed, cached copy of the web. An internal research model used a DNS-resolver misconfiguration on Sept. 20 to reach the live internet, OpenAI said, after which it paused its most capable training and evaluation and resumed reinforcement learning and internal inference on Oct. 1. Agents including an upcoming GPT-6 Astra Cyber model spent hundreds of billions of tokens finding flaws the company says it has patched; the post describes internal training and evaluation.