> GPT-5 nano is a closed AI model from OpenAI, released 7 Aug 2025. Index score 130 (GPT-4 = 100), rank 117 of 229 ranked models. API price $0.050 in / $0.40 out per million tokens, 400K context.

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# GPT-5 nano

OpenAI

Released 7 Aug 2025

Closed

[Compare](https://themodelindex.org/compare/gpt-5-nano-vs-qwen3-235b-a22b-thinking-jul-2025/)

130119–142

Index score

#117 of 229 models

4/ 8

Core tests taken

4 of 6 areas · plus 13 anchor tests

−23

Versus the frontier at release

best then: GPT-5

Replaced by [GPT-5.4 Nano](https://themodelindex.org/models/gpt-5-4-nano/)

$0.050/ $0.40

Price per million tokens

input / output, list price

400K

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 11 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

69%

Humanity's Last Exam

no result

Maths

evidence

FrontierMath T1-3

20%

Coding

evidence

SWE-bench Verified

no result

Terminal-Bench

22%

Agents

evidence

APEX-Agents

no result

Novel problems

evidence

ARC-AGI-2

3%

Long tasks

no evidence yet

METR time horizon

no result

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

#117

of 219 · 130

Epoch Capabilities Index

overall capability from many benchmarks

#108

of 239 · 139.4

LMArena · Maths

maths questions in chat

#193

of 373 · 1346

LMArena · Coding

coding questions in chat

#205

of 383 · 1384

LMArena · Text

overall chat quality, judged by people

#210

of 388 · 1337

LMArena · Vision

understanding images

#102

of 149 · 1146

LMArena · Creative writing

creative writing

#271

of 386 · 1246

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

Replaced by GPT-5.4 Nano; it no longer leads any category among current models.

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 · 2 · per million tokens, in / out

O

OpenAI

$0.050 / $0.40

cheapest

A

Azure

$0.055 / $0.44

↗

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

7 Aug 2025

Announcement

not linked yet

Release entry

–

Scored as

GPT-5 nano

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## OpenAI releases · around this one

ChatGPT

Closed

30 NOV 2022

GPT-4

Closed

14 MAR 2023

index 100

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Source: https://themodelindex.org/models/gpt-5-nano/ · The Model Index · data as of 2026-10-01