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Grok 4

Grok 4 is xAI's high-capability Grok 4 reasoning model. It uses chain-of-thought reasoning for mathematics, science, and coding workloads with a context window of 256K tokens.

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index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'xai/grok-4',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • How does Grok 4 compare to Grok 3?

    Grok 4 is the full Grok 4 model. It scores higher than Grok 3 on reasoning benchmarks, plus improved instruction following and deeper chain-of-thought output.

  • Does Grok 4 show its reasoning process?

    Yes. Grok 4 generates chain-of-thought reasoning traces visible in the API response. You can inspect and verify the model's reasoning steps.

  • What is the context window for Grok 4?

    The context window is 256K tokens.

  • What does Grok 4 cost?

    See the pricing section on this page for today's rates. AI Gateway exposes each provider's pricing for Grok 4.

  • How do I authenticate with Grok 4 through Vercel AI Gateway?

    Use your Vercel AI Gateway API key with xai/grok-4 as the model identifier. AI Gateway handles provider routing automatically.

  • When should I use Grok 4 versus Grok 4 Fast?

    Use Grok 4 when reasoning depth and accuracy are paramount. Use Grok 4 Fast variants when you need faster responses and can accept some quality tradeoff on the hardest reasoning tasks.

  • Does Vercel AI Gateway support Zero Data Retention for Grok 4?

    Zero Data Retention is not currently available for this model. ZDR on AI Gateway applies to direct gateway requests; BYOK flows aren't covered. See https://vercel.com/docs/ai-gateway/capabilities/zdr for details.