GPT-OSS 120B

About this model

GPT-OSS 120B is a powerful 117B parameter Mixture-of-Experts reasoning model with 5.1B active parameters, released under Apache 2.0. Features configurable reasoning effort (low/medium/high), full chain-of-thought visibility, and runs on a single 80GB GPU thanks to MXFP4 quantization. Native support for function calling, web browsing, Python code execution, and structured outputs. Designed for agentic tasks and complex reasoning with production-grade performance. Fully customizable for specialized use cases on single H100/MI300X.

Technical specifications

Capabilities

Input modalities

Output modalities

Reasoning

Default on high

Knowledge horizon