OpenAI o1⁠, our reasoning model designed to handle complex multi-step tasks with advanced accuracy, is rolling out to developers on usage tier 5⁠(opens in a new window) in the API. o1 is the successor to OpenAI o1‑preview⁠, which developers have already used to build agentic applications to streamline customer support, optimize supply chain decisions, and forecast complex financial trends.

o1 is production-ready with key features to enable real-world use cases, including:

The snapshot of o1 we’re shipping today o1‑2024‑12‑17 is a new post-trained version of the model we released in ChatGPT two weeks ago. It improves on areas of model behavior based on feedback, while maintaining the frontier capabilities we evaluated in our o1 System Card.⁠ We’re also updating o1 in ChatGPT to this version soon. The evaluations we’re sharing below reflect the performance of this new snapshot, ensuring developers have up-to-date benchmarks for this version.

o1‑2024‑12‑17 sets new state-of-the-art results on several benchmarks, improving cost-efficiency and performance.