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Grok 4.20 Reasoning

Grok 4.20 Reasoning is xAI's reasoning model in the Grok 4.20 beta generation, supporting extended thinking for complex problem-solving with low hallucination rates and strict prompt adherence.

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index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'xai/grok-4.20-reasoning',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • What does 'reasoning' mean for Grok 4.20 Reasoning?

    Grok 4.20 Reasoning generates chain-of-thought reasoning traces before producing final answers. This extended thinking improves accuracy on complex tasks at the cost of additional latency and tokens.

  • What is the context window for Grok 4.20 Reasoning?

    2M tokens.

  • Is Grok 4.20 Reasoning in beta?

    Yes. Grok 4.20 Reasoning is currently in beta. Behavior, pricing, or availability may change before general availability.

  • What does Grok 4.20 Reasoning cost?

    Rates are listed on this page. They reflect the providers routing through AI Gateway and shift when providers update their pricing.

  • How do I authenticate with Grok 4.20 Reasoning through Vercel AI Gateway?

    Use your Vercel AI Gateway API key with xai/grok-4.20-reasoning as the model identifier. AI Gateway manages routing and authentication automatically.

  • Can I see the reasoning traces?

    Yes. Chain-of-thought traces are included in the API response. You can inspect and log them for debugging and auditing.

  • Does Vercel AI Gateway support Zero Data Retention for Grok 4.20 Reasoning?

    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.