openai / text-generation updated 11 months ago

gpt-oss-20b

Name: gpt-oss-20b
Author: openai

Welcome to the gpt-oss series, OpenAI’s open-weight models designed for powerful reasoning, agentic tasks, and versatile developer use cases.

Params

21.5 B

Context

131,072

Downloads 30d

8.6 M

Likes

4,878

Commercial use: allowed apache-2.0 Not gated SAFETENSORS View on Hugging Face ↗

Download history

daily snapshots · 10 days

8.6 M8.1 M

Jul 28Jul 31Aug 3Aug 6

Can you run it?

Estimated VRAM at 8K context unless noted. Pick your hardware to see the verdict per quantization.

File	Quant	Size	Est. VRAM	Verdict on RTX 4090 · 24 GB
model.safetensors	u8	27.5 GB	34.0 GB	❌ Won’t fit
model.safetensors (bf16, full)	bf16 + 128K ctx	27.5 GB	82.4 GB	❌ Won’t fit

Estimate: file size × 1.1 + KV cache at 8K + 0.5 GB overhead. Not a benchmark — how we calculate this.

Run it

copy-paste, exact tags checked against the Hub

~ · curl · api/v1

$ curl -s https://aimodelscomparison.com/api/v1/models/gpt-oss-20b
{
  "hf_id": "openai/gpt-oss-20b",
  "params_b": 21.51,
  "context_length": 131072,
  "license": { "id": "apache-2.0", "commercial": "yes" },
  "downloads_30d": 8616555,
  "vram_estimates": [
    { "quant": "u8", "gb": 34.0 }
  ],
  "updated_at": "2026-07-28T17:06:36Z"
}

est. VRAM —on RTX 4090 · 24 GBJSON API →

Specifications

Architecture: GptOssForCausalLM
Parameters: 21.5 B
Tensor type: U8
Context length: 131,072
Vocabulary: 201,088
Layers / heads: 24 / 64
Licence: apache-2.0
First seen on the Hub: 2025-08-04
Training datasets: undisclosed
Added to our catalog: 2026-07-28

Family

Base model and the most-downloaded derivatives in the catalog.

Derivative gpt-oss-20b-GGUF unsloth 560 K Derivative gpt-oss-20b-MXFP4-Q8 mlx-community 355 K

Compare with

Qwen3-8B 16.3 M Qwen2.5-7B-Instruct 12.1 M Qwen3.6-35B-A3B-NVFP4 11.3 M Qwen3-32B 8.3 M Llama-3.1-8B-Instruct 8.0 M dolphin-2.9.1-yi-1.5-34b 4.6 M

Appears in

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