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Grok 4 Fast Non-Reasoning

Grok 4 Fast Non-Reasoning is the speed-optimized, non-reasoning variant of xAI's Grok 4 Fast. It delivers fast inference without chain-of-thought overhead, tailored for high-throughput applications within a context window of 2M tokens.

Tool UseImplicit Cachingtiered-costVision (Image)File InputWeb Search
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'xai/grok-4-fast-non-reasoning',
  prompt: 'Why is the sky blue?'
})
OverviewPlaygroundAboutProvidersThroughputLatencyUptimeStatusSimilarFAQ

Frequently Asked Questions

  • What does 'non-reasoning' mean for Grok 4 Fast Non-Reasoning?

    The model produces direct answers without generating chain-of-thought reasoning traces. This reduces latency and output token consumption compared to the reasoning variant.

  • How does Grok 4 Fast Non-Reasoning differ from Grok 4 Fast Reasoning?

    Both share the same Grok 4 Fast foundation. The reasoning variant generates chain-of-thought traces for analytical tasks, while Grok 4 Fast Non-Reasoning produces direct responses optimized for speed.

  • What is the context window?

    2M tokens.

  • What does Grok 4 Fast Non-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 Fast Non-Reasoning through Vercel AI Gateway?

    Use your Vercel AI Gateway API key with xai/grok-4-fast-non-reasoning as the model identifier. No separate xAI account is required for gateway-managed access.

  • Can Grok 4 Fast Non-Reasoning call tools and functions?

    Yes. Grok 4 Fast Non-Reasoning supports tool calling and function invocation, making it suitable for agentic workflows that need fast decision-making.

  • Does Vercel AI Gateway support Zero Data Retention for Grok 4 Fast Non-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.