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Grok 4.3

Grok 4.3 is a xAI reasoning model with an improved architecture and a December 2025 knowledge cutoff, matching the scale of Grok 4.20 within a context window of 1M tokens.

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


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

P50 throughput on live AI Gateway traffic, in tokens per second (TPS). Visit the docs for more info.