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Grok 4.3

xai/grok-4.3

Grok 4.3 is a new model matching the scale of Grok 4.20 with an improved architecture and a December 2025 knowledge cutoff.

ReasoningTool UseImplicit CachingFile InputVision (Image)
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'xai/grok-4.3',
  prompt: 'Why is the sky blue?'
})