OpenAI Open Models

OpenAI's open models, gpt-oss-120b and gpt-oss-20b, are open-weight language models released under the permissive Apache 2.0 license, meaning they can be downloaded, run, modified, and used commercially without an API.

They are built for reasoning and agentic tasks such as tool calling and code execution, and expose a configurable reasoning effort so a deployment can trade speed for depth. The smaller 20b model is sized to run on a single high-end consumer GPU, while 120b targets a single data-center accelerator.

They are aimed at developers and organizations that need data to stay on their own infrastructure, want to fine-tune on private data, or need predictable cost at scale.