xAI: grok-4-fast

Input price
$0.2/1M tokens
Output price
$0.5/1M tokens

Capabilities

Infrastructure
Streaming

Details

Model IDgrok/grok-4-fast
Creator xAI
Familygrok-4
License—
Status—
Typechat
Input modalitiestext
Output modalitiestext
Open weight—
Parameters—
Architecture—
Context window—
Max input—
Max output—
Reasoning tokens—
Knowledge cutoff—
Release date—
Sourceofficial

Pricing

Input
$0.2
Output
$0.5
Cache write
—
Cache read
—
Batch in
—
Batch out
—

Family Comparison: grok-4

ModelContextMax outPricing
OpenRouter: x-ai/grok-4-fast:free———
Azure OpenAI: grok-4-1-fast-non-reasoning——$0.2$0.5
Azure OpenAI: grok-4-1-fast-reasoning——$0.2$0.5
Azure OpenAI: grok-4-fast-non-reasoning——$0.2$0.5
Azure OpenAI: grok-4-fast-reasoning——$0.2$0.5
xAI: grok-4-1-fast-non-reasoning2M—$0.2$0.5
xAI: grok-4-1-fast-reasoning-latest——$0.2$0.5
xAI: grok-4-1-fast-reasoning2M—$0.2$0.5
xAI: grok-4-1-fast——$0.2$0.5
xAI: grok-4-fast-non-reasoning2M—$0.2$0.5
xAI: grok-4-fast-reasoning-latest——$0.2$0.5
xAI: grok-4-fast-reasoning2M—$0.2$0.5
xAI: grok-4-fast——$0.2$0.5
OpenRouter: x-ai/grok-4-fast——$0.2$0.5
Azure OpenAI: grok-4——$3$15
xAI: grok-4-07-09256K—$3$15
xAI: grok-4——$3$15
OpenRouter: x-ai/grok-4-07-09——$3$15
OpenRouter: x-ai/grok-4——$3$15

API

GET/v1/models/cloudflare-ai-gateway/grok/grok-4-fast

xAI: grok-4-fast

grok/grok-4-fast
Changes · 3 entries
grok/grok-4-fastupdate1cd659eMar 24, 2026, 04:19 AM
modalitiesinput["text"]output["text"]
grok/grok-4-fastupdate2b100acMar 23, 2026, 05:30 AM
model_typechat
grok/grok-4-fastcreate7a4f1f6Mar 22, 2026, 05:43 AM