Grok 4 Fast Reasoning

by xAI

Grok 4 Fast Reasoning from xAI — text model on the Opper gateway.

ReasoningVisionToolsStructured output

Context window

Max output

30K

Input price

$0.20 /1M

Output price

$0.50 /1M

Benchmarks

Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.

Global rank#108 of 505 LLMs

TierStrong

Output speed49 tok/s

First token10.25s

Intelligence Index35.1

Coding Index27.4

Math Index89.7

MMLU-Pro

85%

GPQA Diamond

85%

Humanity's Last Exam

17%

LiveCodeBench

83%

SciCode

44%

AIME 2025

90%

IFBench

51%

Long-context reasoning

65%

Terminal-Bench Hard

19%

τ²-Bench Telecom

66%

See full leaderboard →Benchmarks via Artificial Analysis · View on AA

Available routes

The same Grok 4 Fast Reasoning runs on 2 different routes through the Opper gateway. Each route has its own data-handling posture.

Provider	Region	Zero data retention	Training	Logging	Contract	Input	Output
xAI	US	Opt-in	No (opt-in)	Up to 30 days for abuse monitoring	Enterprise	$0.20	$0.50
xAI	EU	Opt-in	No (opt-in)	Up to 30 days for abuse monitoring	Enterprise	$0.20	$0.50

Human review: Abuse-flagged only

Other models from xAI

Grok 4 Fast Non-Reasoning

xAI

Grok 4 Fast Non-Reasoning

xAI

Grok 4.1 Fast Non-Reasoning

xAI

Grok 4.1 Fast Non-Reasoning

xAI

Grok 4.1 Fast Non-Reasoning

xAI

Grok 4.1 Fast Reasoning

xAI