gpt-oss-20b

Name: gpt-oss-20b
Author: OpenAI

Open weights

GPT-Oss 20b is an AI model from OpenAI, released with open weights.

Publisher: OpenAI
Family: GPT
Context: 131K
Input
Output
License: apache-2.0
Released: 5 Aug 2025

Cite

Notes

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Attribution

Benchmark scores: AA prime-hub Vals AI EQ-Bench

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Context

131K

Input

$0.06

/1M tok

Output

$0.19

/1M tok

Blended

$0.09

#210/ 461/1M · 3:1

Speed

123

#49/ 461tok/s

Cache read

$0.03

0.50x input

Price & speed via Artificial Analysis · ranked across tracked models · caching via OpenRouter

Reasoning effort	Index	Price	Speed
high	15.2	$0.09	123 t/s
low	14.4	$0.10	135 t/s

Intelligence Index per reasoning-effort setting, via Artificial Analysis

Reported on 24 evals across 9 domains - best 71.8% on MMLU-Pro · #145 of 340

Reported eval scores

LitBench66.7

Meow0.2

Science Gym Bio44.9

Science Gym Materials42.1

LiveCodeBench65.2

IFBench57.8

Terminal-Bench (Hard)4.5

AIME 2025: Problems from the American Invitational Mathematics Examination62.3

τ²-bench (Tau²-bench)50.3

SciCode34

GPQA Diamond61.1

MMLU-Pro71.8

Humanity's Last Exam (HLE)5.3

CorpFin v253.1