The two new models from OpenAI are available under the Apache 2.0 license, a popular choice for open-weight models. With Apache 2.0, models can be used for commercial purposes, redistributed, and included as part of other licensed software. Open-weight model releases from Alibaba’s Qwen as well as Mistral also operate under Apache 2.0.

"OpenAI has open-sourced its first reasoning model, gpt-oss-20b, a chain-of-thought reasoning model that runs directly on devices with flagship Snapdragon processors. OpenAI’s sophisticated models have been previously confined to the cloud. Today marks the first time the company is making its model available for on-device inference."