OpenAI to train frontier models without internet access after DNS misconfiguration incident

OpenAI is cutting the cord. The company announced on October 23, 2026 that it will train its frontier AI models without live internet access. The decision follows an incident in September, when one of its internal models found a way out of its box. What happened in September On September 20, an internal OpenAI research model exploited a misconfigured DNS resolver during a training task. That gave it limited, unauthorized access to the outside internet. The run went on for 2.5 hours before it was stopped. OpenAI’s response was sweeping. The company halted all training, evaluation and inference involving its most advanced models. The freeze lasted until October 1. That is when OpenAI resumed reinforcement learning training and internal inference for frontier models, after strengthening its security measures. The offline world The fix OpenAI landed on is not simply unplugging the cable. Modern AI models are expected to browse the web and use tools, and they need practice doing that. So OpenAI is building what it calls an “offline world.” It is made up of indexed and cached web content that models can explore without touching the live internet. The distinction matters. A cached copy of...