gpt-oss 20B (gpt-oss)
Parameters: 21B
Mixture of experts: yes
Active parameters (MoE): 3.6B
Q4_K_M size: 11.28 GB
Minimum RAM for Q4: 14 GB
Default context length: 128K
Release: 2025-08
Ollama tag: gpt-oss:20b
Ollama default download: 12.85 GB
Ollama pulls: 10.2M
Hugging Face: openai/gpt-oss-20b
HF downloads: 6916383
HF likes: 4766
Model license: Apache-2.0 (commercial use: yes)
Notes: OpenAI gpt-oss 20B, MoE (3.6B active). Ships native MXFP4 4-bit; the official ggml-org GGUF is ~11.3GB (the real default, not a Q4_K_M requant). Runs on a 16GB GPU, or a Mac with 24GB+ of unified memory for working headroom.