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X-Ai/Grok 4.1 Fast Reasoning

xAI · grok-4-1-fast-reasoning

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

Specification

xai listing

Context
2M
Max output
2M
Released
2025-12-19
Knowledge cutoff
2025-11
Retires
2026-05-15
Open weights
no
Input
text, image, audio, video
Output
text

Price

US dollars per million tokens · xai list price

Input
$1.25
Output
$2.50
Cache read
$0.20

Long-context price tiers

the rate above each context threshold

AbovePrice$/M
200KCache read$0.40
200KInput$2.50
200KOutput$5.00

Available from 14 hosts

HostIn $/MOut $/MCache rdCache wrContextOutputRetires
xaivendor$1.25$2.50$0.202M2M2026-05-15
jiekou$0.18$0.452M2M
302ai$0.20$0.502M30K
azure$0.20$0.50$0.05128K8K
azure_ai$0.20$0.50131K131K
frogbot$0.20$0.50$0.052M128K
google-vertex$0.20$0.50$0.05128K30K
helicone$0.20$0.50$0.052M2M
llmgateway$0.20$0.50$0.052M30K
llmgateway-providers · azure-ai-foundry$0.20$0.502M30K
vercel · spacexai$0.20$0.50$0.051M1M
vertex_ai$0.20$0.50$0.05128K128K
poe2M30K
qiniu-ai · x-ai20M2M

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