Bright key facts / Deployed
Reasoning weights people can run themselves.
OpenAI released gpt-oss-120b and gpt-oss-20b as Apache-2.0 open-weight reasoning models, with downloadable weights and reference implementations for local deployment.
- AI’s role
- Two mixture-of-experts language models designed for tool use, structured outputs, and adjustable reasoning effort.
- Documented result
- OpenAI states that the 120b model can run within 80 GB of memory and the 20b model within 16 GB; the weights are downloadable from Hugging Face. It reports benchmark results in which 120b approaches o4-mini on core reasoning and 20b is similar to o3-mini on common benchmarks.
- Important limitation
- These are open-weight releases, not a complete public release of training data or all model-development details.