OpenAI is bringing its o1 model to its API — and introducing other, related developer-focused improvements across its product portfolio.

For the last day of ship-mas, OpenAI previewed a new set of frontier “reasoning” models dubbed o3 and o3-mini. The Verge first reported that a new reasoning model would be coming during this event.

Application developers who access OpenAI through its long-running API will now have access to the company's latest full o1 model, rather than the months-old o1-preview. The upgrade is one of a number of new features being rolled out to OpenAI's developer customers starting today.