OpenAI’s safety monitoring adds about 20% compute overhead

This article was published on August 19, 2026 OpenAI paused reinforcement-learning training on its newest models for two weeks and put its largest frontier run on hold. A new monitoring system adds about 20% compute overhead, which it says it will not bill to customers. Anthropic says it does not need to slow down. OpenAI has put figures and detail on the slowdown it signalled this week. It paused some frontier training for two weeks, it said. It is also running a new monitoring system for the riskiest work. That system adds about 20 percent to the compute cost of what it covers. The company set out the changes in a blog post on Tuesday. It expands on the safety rethink OpenAI first disclosed after a breach at Hugging Face. The pause is specific. OpenAI said it stopped reinforcement-learning training on its latest deployment-bound models for two weeks. During that time it hardened and red-teamed its research systems. Its largest planned frontier run “remains on hold,” the company said. In the meantime it is running smaller training jobs and evaluations to test its safeguards. Chief scientist Jakub Pachocki and president Greg Brockman said the same in social-media posts. Reinforceme