> gpt-oss-120b is an open-weights AI model from OpenAI, released 5 Aug 2025. Index score 131 (GPT-4 = 100), rank 114 of 229 ranked models. API price $0.037 in / $0.17 out per million tokens, 131K context.

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# gpt-oss-120b

OpenAI

Released 5 Aug 2025

Open

Date verified

[Compare](https://themodelindex.org/compare/gpt-oss-120b-vs-gpt-5/) [Run it yourself →](https://themodelindex.org/local/) [Announcement](https://openai.com/index/gpt-oss-model-card/)

131120–143

Index score

#114 of 229 models

4/ 8

Core tests taken

4 of 6 areas · plus 11 anchor tests

−15

Versus the frontier at release

best then: o3

$0.037/ $0.17

Price per million tokens

input / output, list price

131K

Context window

tokens it reads at once

## Where it sits · on the frontier

_Chart: Model Index score of every scored model since late 2022, with the best closed and best open model over time_

o1 reached this score 8 months earlier.

## Test results · by area · tick = best by any model

Show 8 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

76%

Humanity's Last Exam

no result

Maths

evidence

FrontierMath T1-3

no result

Coding

evidence

SWE-bench Verified

no result

Terminal-Bench

19%

Agents

evidence

APEX-Agents

4%

Novel problems

no evidence yet

ARC-AGI-2

no result

Long tasks

evidence

METR time horizon

42 min

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

## What others say · rank on each leaderboard

The Model Index

independent tests, our method

#114

of 219 · 131

LMArena · Maths

maths questions in chat

#162

of 373 · 1381

Epoch Capabilities Index

overall capability from many benchmarks

#104

of 239 · 139.9

Artificial Analysis Intelligence Index

overall capability across ten evaluations

#96

of 207 · 12

LMArena · Text

overall chat quality, judged by people

#190

of 388 · 1352

LMArena · Coding

coding questions in chat

#197

of 383 · 1390

LMArena · Creative writing

creative writing

#241

of 386 · 1278

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

## Best at · top three among current models

Not in the top three among current models on any category we track.

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

## Where to use it · prices checked 1 Oct 2026

#### From the lab

ChatGPT

app · subscription

↗

OpenAI API

API

↗

#### API providers · 20 · per million tokens, in / out

C

CoreWeave

$0.030 / $0.17 · fp4

cheapest

D

DekaLLM

$0.030 / $0.18 · bf16

↗

D

DeepInfra

$0.15 / $0.60 · bf16

↗

A

AkashML

$0.037 / $0.19 · bf16

↗

C

Crusoe

$0.050 / $0.25 · bf16

↗

N

Novita

$0.050 / $0.25 · fp4

↗

M

Mancer 2

$0.050 / $0.30 · fp8

↗

D

DigitalOcean

$0.060 / $0.42

↗

#### Run it yourself

🤗

Official weights

openai/gpt-oss-120b

↗

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

## Facts and sources

Released

5 Aug 2025

Announcement

[openai.com ↗](https://openai.com/index/gpt-oss-model-card/)

Release entry

gpt-oss-120b/20b

Scored as

gpt-oss-120b

Artificial Analysis index

12 · high

Output speed

171 tokens/s

Hugging Face

[openai/gpt-oss-120b ↗](https://huggingface.co/openai/gpt-oss-120b)

## OpenAI releases · around this one

o4-mini

Closed

16 APR 2025

index 143

codex-1

Closed

16 MAY 2025

gpt-oss-120b

Open

5 AUG 2025

index 131

gpt-oss-20b

Open

5 AUG 2025

index 128

GPT-5

Closed

7 AUG 2025

index 154

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Source: https://themodelindex.org/models/gpt-oss-120b/ · The Model Index · data as of 2026-10-01