> Grok 4 is a closed AI model from xAI, released 9 Jul 2025. Index score 147 (GPT-4 = 100), rank 64 of 229 ranked models.

[Models](https://themodelindex.org/models/) /[xAI](https://themodelindex.org/labs/xai/)

# Grok 4

xAI

Released 9 Jul 2025

Closed

Flagship

Date verified

[Compare](https://themodelindex.org/compare/grok-4-vs-qwen3-235b-a22b-thinking-jul-2025/) [Announcement](https://x.ai/news/grok-4)

147135–158

Index score

#64 of 229 models

4/ 8

Core tests taken

4 of 6 areas · plus 14 anchor tests

Frontier

Versus the frontier at release

set or matched the record

Replaced by [Grok 4.1](https://themodelindex.org/models/grok-4-1/)

–

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_

o3 reached this score 3 months earlier.

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

Show 11 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

87%

Humanity's Last Exam

no result

Maths

evidence

FrontierMath T1-3

no result

Coding

evidence

SWE-bench Verified

no result

Terminal-Bench

27%

Agents

evidence

APEX-Agents

no result

Novel problems

evidence

ARC-AGI-2

16%

Long tasks

evidence

METR time horizon

1.8 h

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

#64

of 219 · 147

Epoch Capabilities Index

overall capability from many benchmarks

#69

of 239 · 146.4

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 Grok 4.1; 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

Grok

app · subscription

↗

xAI 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

9 Jul 2025

Announcement

[x.ai ↗](https://x.ai/news/grok-4)

Release entry

Grok 4 (+ Heavy)

Scored as

Grok 4

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## xAI releases · around this one

Grok-2

Closed

13 AUG 2024

Grok 3

Closed

17 FEB 2025

Grok 4

Closed

9 JUL 2025

index 147

Grok 2.5

Open

23 AUG 2025

Grok Code Fast 1

Closed

28 AUG 2025

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