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

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Notes

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Attribution

Benchmark scores: AA prime-hub Vals AI

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Context

131K

Input

$0.06

/1M tok

Output

$0.20

/1M tok

Blended

$0.10

#175/ 414/1M · 3:1

Speed

273

#11/ 414tok/s

Price & speed via Artificial Analysis · ranked across tracked models

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

Reported eval scores

22

Taxcalc Bench0.6

Taxcalc Bench0.9

Backend Bench7.2

Xbench Scienceqa20

Science Gym Chem60.1

Science Gym Bio44.9

Science Gym Materials42.1

Terminal-Bench (Hard)4.5

LiveCodeBench65.2

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

GPQA Diamond61.1

τ²-bench (Tau²-bench)50.3

Humanity's Last Exam (HLE)5.1