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gpt-oss-20b

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
AAprime-hubVals AI
Attribution policy →
Context
131K
Input
$0.06
/1M tok
Output
$0.20
/1M tok
Blended
$0.10
#193/ 458/1M · 3:1
Speed
261
#14/ 458tok/s
Cache read
$0.03
0.50x input

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

Reported on 22 evals across 8 domains - best 71.8% on MMLU-Pro · #147 of 342

Reported eval scores

22
LitBench66.7
Taxcalc Bench0.6
Taxcalc Bench0.9
Meow0.2
Backend Bench0
Backend Bench7.2
Xbench Scienceqa20
Science Gym Chem60.1
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
SciCode34
GPQA Diamond61.1
τ²-bench (Tau²-bench)50.3
MMLU-Pro71.8
Humanity's Last Exam (HLE)5.1
CorpFin v253.1