The company unveiled two new open-weight language models, gpt-oss-120b and gpt-oss-20b, marking its first public release of freely available AI model weights since GPT-2 in 2019, long before the AI hype took over the tech world.

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).

For the first time in five years, OpenAI has released two new free and open-source AI models that are lightweight and designed to be easily integrated into other software programs.