OpenAI has launched two new o-series models—o3 and o4-mini—which are trained to think longer before responding.

OpenAI is releasing a whole galaxy of new models that are all about getting things done better, faster… and cheaper.

Sam Altman, CEO of OpenAI, explains an approach towards building reasoning models that can access and use every tool that is available within ChatGPT, depending on query — this includes web search, ...