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 more than five years, OpenAI is launching a new open language model that appears to be state-of-the-art.

OpenAI is aiming the new models at customers who want the cost savings and privacy benefits that come from running AI models directly on their own devices rather than relying on cloud-based services like ChatGPT or its rivals.