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gpt-oss-120b

GPT-Oss 120b 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

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Context
131K
Weights
Open
downloadable
Input
$0.15
/1M tok
Output
$0.59
/1M tok
Blended
$0.26
#256/ 472/1M · 3:1
Speed
178
#31/ 472tok/s
Cache read
$0.03
0.20x input

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

Reasoning effortIndexPriceSpeed
high12.3$0.26178 t/s
low10.2$0.25197 t/s

Intelligence Index per reasoning-effort setting, via Artificial Analysis

Reported on 31 evals across 9 domains - best 97.9% on Spam Detection RL Environment · #2 of 2

Reported eval scores

31
Mastermind1.6
Backend Bench38.9
Backend Bench7.6
Mastermind1.5
Spam Detection RL Environment97.9
LiveCodeBench87.8
Aider Polyglot Benchmark41.8
SWE-bench Verified26
AIME 2025: Problems from the American Invitational Mathematics Examination93.4
IFBench69
Terminal-Bench (Hard)23.5
LiveBench - Coding60.2
LiveBench - Language48.6
LiveBench - Instruction Following50.3
LiveBench - Math68.9
LiveBench - Reasoning39.2
LiveBench - Data Analysis38.8
MMLU-Pro80.8
Humanity's Last Exam (HLE)19.6
LiveBench51

Head-to-heads

29

benchmark comparisons against other models

vs GPT-5 Mini25 shared evalsvs Claude Sonnet 4.523 shared evalsvs DeepSeek V3.223 shared evalsvs GPT-5 Nano22 shared evalsvs GPT-5.222 shared evalsvs Claude Opus 4.521 shared evalsvs Claude 4 Sonnet21 shared evalsvs Grok 4.1 Fast20 shared evalsvs GLM 4.720 shared evalsvs GPT-5.519 shared evalsvs Claude Opus 4.619 shared evalsvs Kimi K2.519 shared evalsvs GLM 5.119 shared evalsvs Gemini 2.5 Pro19 shared evalsvs Gemini 3.1 Pro Preview18 shared evalsvs Claude Opus 4.818 shared evalsvs Claude Fable 518 shared evalsvs GPT-5.418 shared evalsvs Claude Opus 4.718 shared evalsvs Claude Sonnet 4.618 shared evalsvs GPT-517 shared evalsvs GPT-4o17 shared evalsvs GPT-5.4 Mini17 shared evalsvs GPT-4.116 shared evalsvs Qwen3.6 Plus16 shared evalsvs GPT-4.1 Mini15 shared evalsvs GPT-4o-mini15 shared evalsvs GPT-4.1 Nano14 shared evalsvs GPT-6 Astra6 shared evals