OpenAI Publishes Updated Model Spec Defining Behavior for More Capable AI Systems

OpenAI has released an updated Model Spec, the foundational document that governs how its models should reason, behave, and prioritize competing objectives as capabilities scale. The update refines guidance around corrigibility, honesty, and harm avoidance, and reflects lessons learned from deploying increasingly autonomous systems. For developers building on OpenAI APIs, the spec signals what behavioral constraints will be baked into future model releases and how edge-case instructions will be handled. Teams working on agentic workflows or high-stakes deployments should read the spec directly to understand where models will defer, refuse, or escalate. This is a living document that will shape the character of every OpenAI model going forward.