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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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Frequently Asked Questions

  • What is the knowledge cutoff for Grok 4.3?

    Grok 4.3 has a December 2025 knowledge cutoff. Pair it with web search or retrieval for facts that change after that date.

  • How does Grok 4.3 compare to Grok 4.20?

    Grok 4.3 matches the scale of Grok 4.20 and refines the underlying architecture. It also carries a newer December 2025 knowledge cutoff.

  • What is the context window for Grok 4.3?

    The context window is 1M tokens, with up to 1M tokens per response.

  • What capabilities does Grok 4.3 support?

    Grok 4.3 supports reasoning, tool use, implicit caching, file input, vision, and web search through AI Gateway.

  • What does Grok 4.3 cost?

    See the pricing section on this page for today's rates. AI Gateway exposes each provider's pricing for Grok 4.3.

  • How do I authenticate with Grok 4.3 through Vercel AI Gateway?

    Use your Vercel AI Gateway API key with xai/grok-4.3 as the model identifier. AI Gateway handles provider routing automatically.

  • Does Vercel AI Gateway support Zero Data Retention for Grok 4.3?

    Zero Data Retention is not currently available for this model. Zero Data Retention is offered on a per-provider basis. See https://vercel.com/docs/ai-gateway/capabilities/zdr for details.