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Grok 3 Fast Beta

Grok 3 Fast Beta is the speed-optimized variant of xAI's Grok 3 model. It delivers lower latency inference while keeping the same Grok 3 training foundation, with a context window of 131.1K tokens.

Tool Use
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'xai/grok-3-fast',
  prompt: 'Why is the sky blue?'
})
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Playground

Try out Grok 3 Fast Beta by xAI. Usage is billed to your team at API rates. Free users (those who haven't made a payment) get $5 of credits every 30 days.