Grok 4 Fast (Reasoning)

Last updated: Recently

Model Type

MText

Max Context

2000K

Max Output

30,000 tokens

Parameter Scale

2,000,000 token context window, maximum output of 30,000 tokens. Includes independent benchmarks from Artificial Analysis.

Input Modality

text, image, file

Output Modality

text

Inference Speed

76.710 tokens/s

Latest Release Date

9/19/2025

SDK Ecosystem

artificial-analysismanufactureraa-bootstrap

Model Overview Fields

name

Grok 4 Fast (Reasoning)

Release date

9/19/2025

Performance

76.710 tokens/s

model_creator.name

xAI

AA Evaluation Scores

AA Intelligence Index

35.1

AA Coding Index

27.4

AA Math Index

89.7

MMLU Pro

0.85

GPQA

0.847

HLE

0.17

LiveCodeBench

0.832

SciCode

0.442

Math-500

AIME

AIME 2025

0.896666666666667

IFBench

0.505442176870748

LCR

0.646666666666667

TerminalBench Hard

0.189393939393939

TAU2

0.657894736842105

Output Speed (tokens/s)

76.71 tok/s

TTFT (s)

7.09s

First Answer Token (s)

7.09s

xAI

Grok 4 Fast (Reasoning)

$0.20/M$0.50/M

2,000,000 token context window, maximum output of 30,000 tokens. Includes independent benchmarks from Artificial Analysis.

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