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).

The gpt-oss-20b and 120b models can be downloaded and run locally, with no internet required - offering full transparency, agentic functions, and fine-tuning support