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Grok 4.1 Fast Non-Reasoning

Grok 4.1 Fast Non-Reasoning is xAI's speed-optimized Grok 4.1 Fast model for agentic tool calling. It delivers direct responses without reasoning overhead across a context window of 1M tokens, engineered for high-throughput agent workflows.

Tool UseFile InputVision (Image)Implicit Caching
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'xai/grok-4.1-fast-non-reasoning',
  prompt: 'Why is the sky blue?'
})
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About Grok 4.1 Fast Non-Reasoning

Grok 4.1 Fast Non-Reasoning was released July 9, 2025 as part of xAI's Grok 4.1 Fast generation, specifically engineered for agentic tool-calling operations. The model features a context window of 1M tokens and produces direct responses without chain-of-thought reasoning traces, prioritizing speed and throughput for agent-driven workflows.

The non-reasoning configuration eliminates the token overhead of chain-of-thought generation, making each request faster and cheaper. This is particularly valuable in agentic loops where the model is called repeatedly to decide on tool invocations, parse results, and plan next steps. Lower per-step latency compounds into significantly faster end-to-end workflow completion.

Developers can integrate Grok 4.1 Fast Non-Reasoning using the model identifier xai/grok-4.1-fast-non-reasoning with the AI SDK, Chat Completions API, Responses API, Messages API, and other API formats, from TypeScript or Python. No separate xAI account is required.