> GPT-4.5 is a closed AI model from OpenAI, released 27 Feb 2025. Index score 124 (GPT-4 = 100), rank 129 of 229 ranked models.

[Models](https://themodelindex.org/models/) /[OpenAI](https://themodelindex.org/labs/openai/)

# GPT-4.5

OpenAI

Released 27 Feb 2025

Closed

Flagship

[Compare](https://themodelindex.org/compare/gpt-4-5-vs-deepseek-r1/) [Announcement](https://en.wikipedia.org/wiki/GPT-4.5)

124113–136

Index score

#129 of 229 models

3/ 8

Core tests taken

2 of 6 areas · plus 10 anchor tests

−11

Versus the frontier at release

best then: o1

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

–

Price per million tokens

no public API price found

–

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 3 months earlier.

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

Show 6 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

69%

Humanity's Last Exam

5%

Maths

evidence

FrontierMath T1-3

no result

Coding

evidence

SWE-bench Verified

no result

Terminal-Bench

no result

Agents

no evidence yet

APEX-Agents

no result

Novel problems

evidence

ARC-AGI-2

1%

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

#129

of 219 · 124

Epoch Capabilities Index

overall capability from many benchmarks

#116

of 239 · 136.7

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; 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

↗

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

27 Feb 2025

Announcement

[en.wikipedia.org ↗](https://en.wikipedia.org/wiki/GPT-4.5)

Release entry

GPT-4.5

Scored as

GPT-4.5

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## OpenAI releases · around this one

o1

Closed

5 DEC 2024

index 136

o3-mini

Closed

31 JAN 2025

index 132

GPT-4.5

Closed

27 FEB 2025

index 124

GPT-4.1

Closed

14 APR 2025

index 125

o3

Closed

16 APR 2025

index 147

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Source: https://themodelindex.org/models/gpt-4-5/ · The Model Index · data as of 2026-10-01