As models become more capable, the risks associated with developing and testing them internally…

TL;DR - OpenAI temporarily paused reinforcement-learning training for deployment-bound frontier models to strengthen internal security, monitoring, and alignment safeguards. Its largest planned frontier RL run remains paused while smaller runs and evaluations test those protections.

• The initial RL training pause lasted two weeks while OpenAI hardened and red-teamed its research environments.
• OpenAI expanded monitoring coverage to address growing risks from increasingly capable models.
• Smaller-scale training and evaluations are being used to validate safeguards and gather evidence of alignment.
• The announcement signals that security readiness may directly govern the pace of frontier-model development.