What are the hardware requirements for GPT Oss 20B?

GPT Oss 20B requires approximately 13.8 GB of VRAM and supports a context window of 128K tokens. Quantized variants may run on less VRAM; see the Quantized Models section on this page.

Who developed GPT Oss 20B and how large is it?

GPT Oss 20B is developed by openai, a model with 20b parameters. The model is published as open weights on Hugging Face and indexed on LLM Explorer with full benchmark history.

Where can I download or evaluate GPT Oss 20B?

GPT Oss 20B is hosted on Hugging Face and linked from this page. LLM Explorer also lists quantized variants and similar alternatives if available.

GPT Oss 20B by openai — VRAM 13.8GB, 128K context

Name: GPT Oss 20B
Rating: 4 (5 reviews)
Author: openai

GPT Oss 20B is an open-source language model by openai. Features: 20b LLM, VRAM: 13.8GB, Context: 128K, License: apache-2.0, LLM Explorer Score: 0.44.

Arxiv:2508.10925 8-bit Conversational Deploy:azure Deploy:sagemaker Endpoints compatible Eval-results Gpt oss Mxfp4 Region:us Safetensors Sharded Tensorflow Vllm

Model Card on HF 🤗: https://huggingface.co/openai/gpt-oss-20b

GPT Oss 20B Parameters and Internals

LLM Name	GPT Oss 20B
Repository 🤗	https://huggingface.co/openai/gpt-oss-20b
Model Size	20b
Required VRAM	13.8 GB
Updated	2026-07-28
Maintainer	openai
Model Type	gpt_oss
Model Files	4.8 GB: 0-of-2 4.8 GB: 1-of-2 4.2 GB: 2-of-2
Model Architecture	GptOssForCausalLM
License	apache-2.0
Context Length	131072
Model Max Length	131072
Transformers Version	4.55.0.dev0
Tokenizer Class	PreTrainedTokenizerFast
Padding Token	<\|endoftext\|>
Vocabulary Size	201088

Rank the GPT Oss 20B capabilities

Have you tried this model? Rate its performance — this feedback helps the ML community find the right model for their needs.

Instruction Following and Task Automation
Factuality and Completeness of Knowledge
Censorship and Alignment
Data Analysis and Insight Generation
Text Generation
Text Summarization and Feature Extraction
Code Generation
Multi-Language Support and Translation

Quantized Models of the GPT Oss 20B

Model	Likes	Downloads	VRAM
GPT Oss 20B GGUF	731	479956	11 GB
GPT Oss 20B MXFP4 Q8	2	397	12 GB
GPT Oss 20B MXFP4 Q8	79	354421	12 GB
GPT Oss 20B OptiQ 4bit	6	1690	11 GB
GPT Oss 20B Unsloth Bnb 4bit	38	64914	12 GB
GPT Oss 20B MLX 8bit	58	2890	22 GB
GPT Oss 20B MXFP4 Q4	16	2178	11 GB
GPT Oss 20B Bnb 4bit	14	2402	40 GB

Best Alternatives to GPT Oss 20B

Best Alternatives	Context / RAM	Downloads	Likes
OTel LLM 20B Reasoning	128K / 83.8 GB	1040	1
GPT Oss 20B	128K / 13.8 GB	16416	47
GPT Oss Safeguard 20B	128K / 13.8 GB	154333	239
Atlasv25 TRM Gptoss 20B	128K / 41.8 GB	520	0
Context 1	128K / 41.8 GB	726	414
...erih Gptoss 20B Lora32 Step600	128K / 13.8 GB	286	0
OptiMind SFT	128K / 42 GB	15767	102
Strawberry 1	128K / 41.6 GB	406	2
GPT Oss 20B Heretic Ara V4	128K / 13.8 GB	5339	13
Strawberry	128K / 41.6 GB	221	5