GPT-OSS 20B

About this model

GPT-OSS 20B is OpenAI's first open-weight model, a 21B-parameter mixture-of-experts model with 3.6B active parameters per token. Features configurable reasoning effort (low/medium/high), full chain-of-thought visibility, and agentic capabilities including function calling. Runs on devices with 16GB of memory using MXFP4 quantization.