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 unsloth, a model with 20b parameters. The model is published as open weights on Hugging Face and indexed on LLM Explorer with full benchmark history.

How does GPT Oss 20B perform on standard benchmarks?

GPT Oss 20B has the following published scores: LMSYS ELO 1317. Compare against reference models on this page or on the LLM Explorer leaderboards.

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

Name: GPT Oss 20B
Author: unsloth

GPT Oss 20B is an open-source language model by unsloth. Features: 20b LLM, VRAM: 13.8GB, Context: 128K, License: apache-2.0, LLM Explorer Score: 0.38, ELO: 1317.

8-bit Base model:openai/gpt-oss-20b Base model:quantized:openai/gp... Conversational Endpoints compatible Gpt oss Mxfp4 Region:us Safetensors Sharded Tensorflow Vllm

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

GPT Oss 20B Benchmarks

LMSys ELO 1317 vs 1272 (so35) 3.5%

^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)

GPT Oss 20B Parameters and Internals

LLM Name	GPT Oss 20B
Repository 🤗	https://huggingface.co/unsloth/gpt-oss-20b
Base Model(s)	GPT Oss 20B openai/gpt-oss-20b
Model Size	20b
Required VRAM	13.8 GB
Updated	2026-06-25
Maintainer	unsloth
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
Tokenizer Class	PreTrainedTokenizerFast
Padding Token	<\|reserved_200017\|>
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

Best Alternatives to GPT Oss 20B

Best Alternatives	Context / RAM	Downloads	Likes
GPT Oss 20B	128K / 13.8 GB	7983620	4849
OTel LLM 20B Reasoning	128K / 83.8 GB	1040	1
Strawberry 1	128K / 41.6 GB	406	2
Context 1	128K / 41.8 GB	726	414
GPT Oss Safeguard 20B	128K / 13.8 GB	154333	239
GPT Oss 20B Heretic Ara V4	128K / 13.8 GB	5339	13
OptiMind SFT	128K / 42 GB	15767	102
GPT Oss 20B BF16	128K / 41.6 GB	96874	34
GPT Oss 20B Heretic	128K / 41.6 GB	2413	124
Aryabhata 2.0	128K / 41.8 GB	138	5

Note: green Score (e.g. "73.2") means that the model is better than unsloth/gpt-oss-20b.