> GPT-5.1 is a closed AI model from OpenAI, released 12 Nov 2025. Index score 153 (GPT-4 = 100), rank 52 of 229 ranked models. API price $1.25 in / $10 out per million tokens, 400K context.

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# GPT-5.1

OpenAI

Released 12 Nov 2025

Closed

Flagship

Date verified

[Compare](https://themodelindex.org/compare/gpt-5-1-vs-deepseek-v3-2/) [Announcement](https://openai.com/index/gpt-5-system-card-addendum-gpt-5-1/)

153142–164

Index score

#52 of 229 models

5/ 8

Core tests taken

3 of 6 areas · plus 16 anchor tests

−1

Versus the frontier at release

best then: GPT-5

Replaced by [GPT-5.2](https://themodelindex.org/models/gpt-5-2/)

$1.25/ $10

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_

GPT-5 reached this score 3 months earlier.

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

Show 12 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

88%

Humanity's Last Exam

24%

Maths

evidence

FrontierMath T1-3

no result

Coding

evidence

SWE-bench Verified

68%

Terminal-Bench

48%

Agents

evidence

APEX-Agents

no result

Novel problems

evidence

ARC-AGI-2

18%

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

#52

of 219 · 153

LMArena · Maths

maths questions in chat

#57

of 373 · 1458

LMArena · Text

overall chat quality, judged by people

#61

of 388 · 1456

LMArena · Creative writing

creative writing

#66

of 386 · 1428

LMArena · Coding

coding questions in chat

#81

of 383 · 1492

Epoch Capabilities Index

overall capability from many benchmarks

#52

of 239 · 149.7

LMArena · Vision

understanding images

#43

of 149 · 1251

LMArena · WebDev

building web apps and front ends

#80

of 123 · 1395

LMArena · Documents

working with long documents

#40

of 41 · 1403

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

3rd

SWE-bench Verified

Epoch AI · independent

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

$2.5 / $20

cheapest

A

Azure

$1.38 / $11

↗

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

12 Nov 2025

Announcement

[openai.com ↗](https://openai.com/index/gpt-5-system-card-addendum-gpt-5-1/)

Release entry

GPT-5.1

Scored as

GPT-5.1

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## OpenAI releases · around this one

GPT-5

Closed

7 AUG 2025

index 154

GPT-5-Codex

Closed

15 SEP 2025

GPT-5.1

Closed

12 NOV 2025

index 153

GPT-5.1-Codex-Max

Closed

19 NOV 2025

index 157

GPT-5.2

Closed

11 DEC 2025

index 162

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Source: https://themodelindex.org/models/gpt-5-1/ · The Model Index · data as of 2026-10-01