X-Ai/Grok-4-Fast-Reasoning

Name: X-Ai/Grok-4-Fast-Reasoning
Price: 1.25 USD
Availability: InStock
Author: xai

xAI · grok-4-fast-reasoning

Fast Grok model for responsive chat, reasoning, and tool-assisted work

Specification

xai listing

Context

Max output

Released

2025-12-18

Knowledge cutoff

2025-09

Retires

2026-05-15

Open weights

Input

text, image, audio, video

Output

text

US dollars per million tokens · xai list price

Input

$1.25

Output

$2.50

Cache read

$0.20

the rate above each context threshold

Host	In $/M	Out $/M	Cache rd	Cache wr	Context	Output	Retires
xaivendor	$1.25	$2.50	$0.20	—	2M	2M	2026-05-15
jiekou	$0.18	$0.45	—	—	2M	2M	—
302ai	$0.20	$0.50	—	—	2M	30K	—
azure_ai	$0.20	$0.50	—	—	131K	131K	2026-05-01
helicone	$0.20	$0.50	$0.05	—	2M	2M	—
poe	$0.20	$0.50	$0.05	—	2M	128K	—
qiniu-ai · x-ai	—	—	—	—	2M	2M	—