gpt-oss-120b
OpenAI · 2025-08-05
gpt-oss-120b is the larger of OpenAI's two Apache 2.0-licensed gpt-oss reasoning models, which are the company's first open-weight language models since GPT-2. It is a text-only mixture-of-experts model with approximately 116.8B total parameters and 5.1B active parameters per token, configurable reasoning effort, and training for tool use.