xAI

Grok 4 Fast

Name: Grok 4 Fast API
Brand: xAI
Availability: OutOfStock

xAI's discount-tier — 2M context, alt-voice, $0.20 / $0.50.

Not currently offered on Token Harbor.

Grok 4.5 is live — same family, currently served and priced.

Model IDgrok-4-fast

Typechat

Context window2,000,000 tokens

Maximum output tokens—

Input—

Output—

CapabilitiesFast, Value, Long context

Modalitiestext