OpenAI’s GPT-5.4 mini and nano are here, and they’re designed to help you get stuff done on a budget.

On Wednesday, OpenAI introduced two new artificial intelligence models to the world. The models, named o3 and o4-mini, are both part of the Sam Altman-led company’s “O” series of reasoning models, ...

Although the entire AI boom was triggered by just one ChatGPT model, a lot has changed since 2022. New models have been released, old models have been replaced, updates roll out and roll back again ...

UPDATE: Apr. 16, 2025, 2:18 p.m. EDT Now that the OpenAI livestream has ended, this article has been updated with the latest information about the o3 and o4-mini launch. OpenAI's o3 and o4-mini models ...