GPT OSS 120B is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1B parameters per forward pass and is optimized to run on a single H100 GPU with native MXFP4 quantization. The model supports configurable reasoning depth, full chain-of-thought access, and native tool use, including function calling, browsing, and structured output generation.
Try NowHigh-reasoning production tasks
Agentic workflows with tool use
General-purpose reasoning with configurable depth
131,072 tokens
131,072 tokens
$0.039
$0.19
$15
$0.19