> Grok Build 0.1 is a closed AI model from xAI, released 20 May 2026. API price $1.0 in / $2.0 out per million tokens, 256K context.

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# Grok Build 0.1

xAI

Released 20 May 2026

Closed

Reasoning

[Compare](https://themodelindex.org/compare/grok-build-0-1-vs-glm-5-2/) [Announcement](https://x.ai/news/grok-build-0-1)

–

Index score

Not yet evaluated independently

–

Core tests taken

no independent results yet

–

Versus the frontier at release

$1.0/ $2.0

Price per million tokens

input / output, list price

256K

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_

Not plotted: no index score yet.

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

Reasoning & knowledge

no evidence yet

GPQA Diamond

no result

Humanity's Last Exam

no result

Maths

no evidence yet

FrontierMath T1-3

no result

Coding

no evidence yet

SWE-bench Verified

no result

Terminal-Bench

no result

Agents

no evidence yet

APEX-Agents

no result

Novel problems

no evidence yet

ARC-AGI-2

no result

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

LiveBench · Overall

overall, with fresh questions to limit contamination

#52

of 58 · 67.8

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

Grok

app · subscription

↗

xAI API

API

↗

#### API providers · 1 · per million tokens, in / out

x

xAI

$2.0 / $4.0

cheapest

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

20 May 2026

Announcement

[x.ai ↗](https://x.ai/news/grok-build-0-1)

Release entry

Grok Build 0.1 (coding)

Scored as

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Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## xAI releases · around this one

Grok 4.20

Closed

17 FEB 2026

index 158

Grok 4.3

Closed

17 APR 2026

index 151

Grok Build 0.1

Closed

20 MAY 2026

Grok 4.5

Closed

8 JUL 2026

index 163

Grok 4.6

Closed

12 AUG 2026

index 170

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Source: https://themodelindex.org/models/grok-build-0-1/ · The Model Index · data as of 2026-10-01