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: 0.49.

Arxiv:2508.10925 8-bit Conversational Deploy:azure 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 Benchmarks

LLME Score: 0.48879

^nn.n% — How the model compares to the reference models: Anthropic Sonnet 3.5 ("so35"), GPT-4o ("gpt4o") or GPT-4 ("gpt4").

What is the LLM Explorer Rank (Score)

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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	2026-05-26
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

Quantized Models of the GPT Oss 20B

Model	Likes	Downloads	VRAM
GPT Oss 20B GGUF	710	194945	11 GB
GPT Oss 20B MXFP4 Q8	64	374517	12 GB
GPT Oss 20B OptiQ 4bit	2	22	11 GB
GPT Oss 20B Unsloth Bnb 4bit	38	97758	12 GB
GPT Oss 20B Bnb 4bit	14	14590	40 GB
GPT Oss 20B MLX 8bit	55	5327	22 GB
GPT Oss 20B MXFP4 Q4	15	2199	11 GB

Best Alternatives to GPT Oss 20B

Best Alternatives	Context / RAM	Downloads	Likes
OTel LLM 20B Reasoning	128K / 83.8 GB	1469	0
GPT Oss 20B	128K / 13.8 GB	15535	47
Context 1	128K / 41.8 GB	2035	398
GPT Oss Safeguard 20B	128K / 13.8 GB	71918	220
GPT Oss 20B Heretic Ara V4	128K / 13.8 GB	5339	13
OptiMind SFT	128K / 42 GB	3571	101
Aryabhata 2.0	128K / 41.8 GB	294	2
GPT Oss 20B BF16	128K / 41.6 GB	65828	34
GPT Oss 20B Abliterated	128K / 41.6 GB	826	3
GPT Oss 20B Heretic Ara V3	128K / 13.8 GB	452	31

Rank the GPT Oss 20B Capabilities

🆘 Have you tried this model? Rate its performance. This feedback would greatly assist ML community in identifying the most suitable model for their needs. Your contribution really does make a difference! 🌟

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

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GPT Oss 20B by openai