OpenAI has introduced gpt-oss-120b and gpt-oss-20b, two new open-weight AI models designed to empower developers with cost-effective AI solutions. The gpt-oss-120b model matches the performance of OpenAI's o4-mini and can run on a single GPU,

Despite the company's name, OpenAI hasn't dropped an open version of its AI models since GPT-2 in 2019. That changed on Tuesday, as CEO Sam Altman shared two new open-weights, reasoning AI models, named gpt-oss-120b (120 billion parameters) and gpt-oss-20b (20 billion parameters).