Grok 4.1 Fast Non-Reasoning
Grok 4.1 Fast Non-Reasoning is SpaceXAI'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.
View API reference- Input and output price
- Input $0.20, Output $0.50, Per 1M tokens
- 24h uptime
- Loading AI Gateway uptime
import { streamText } from 'ai'
const result = streamText({ model: 'spacexai/grok-4.1-fast-non-reasoning', prompt: 'Why is the sky blue?'})Copy link to headingPlayground
Try out Grok 4.1 Fast Non-Reasoning by SpaceXAI. Usage is billed to your team at API rates. Free users (those who haven't made a payment) get $5 of credits every 30 days.
Grok 4.1 Fast Non-Reasoning
Grok 4.1 Fast Non-Reasoning
Copy link to headingProviders
Route requests across multiple providers. Copy a provider slug to set your preference. Visit the docs for more info. Using a provider means you agree to their terms, listed under Legal.
Copy link to headingUptime24 hours
Direct request success rate on AI Gateway and per-provider. Visit the docs for more info.
Copy link to headingThroughput24 hours
P50 throughput on live AI Gateway traffic, in tokens per second (TPS). Visit the docs for more info.
Copy link to headingLatency24 hours
P50 time to first token (TTFT) on live AI Gateway traffic, in milliseconds. View the docs for more info.
Getting started
Call Grok 4.1 Fast Non-Reasoning through AI Gateway with the AI SDK generateText and streamText functions, or through the OpenAI Chat Completions, OpenAI Responses, and Anthropic Messages APIs by changing the base URL. AI Gateway authenticates the request and routes it to an available provider.
Install the AI SDK (pnpm add ai dotenv), create an API key from the API Keys page, and set it as AI_GATEWAY_API_KEY in your environment. Full setup is covered in the text generation quickstart.
import { generateText } from 'ai';import 'dotenv/config';
async function main() { const result = await generateText({ model: 'spacexai/grok-4.1-fast-non-reasoning', prompt: 'Why is the sky blue?', });
console.log(result.text);}
main().catch(console.error);Top-level parameters
The same Grok 4.1 Fast Non-Reasoning request in each API format AI Gateway supports.
import { generateText } from 'ai';import 'dotenv/config';
async function main() { const result = await generateText({ model: 'spacexai/grok-4.1-fast-non-reasoning', system: 'You are a concise technical assistant.', prompt: 'Summarize the tradeoffs between static generation and SSR.', maxOutputTokens: 1024, temperature: 0.5, });
console.log(result.text);}
main().catch(console.error);Standard parameters like prompt, messages, temperature, and tools work as documented in the AI SDK docs. These are the parameters with model-specific behavior.
| Parameter | Type | Required | Description |
|---|---|---|---|
model | string | Yes | Model ID in the form creator/model, e.g. spacexai/grok-4.1-fast-non-reasoning. AI Gateway routes the request to an available provider. |
maxOutputTokens | number | No | Hard cap on generated tokens. Grok 4.1 Fast Non-Reasoning supports up to 1,000,000 output tokens. |
providerOptions | Record<string, JSONValue> | No | AI Gateway routing options under gateway, plus any provider-native options under the provider’s own namespace — see the table below. |
Input limits
| Input | Formats | Sources | Max count | Max size | Limits |
|---|---|---|---|---|---|
| Text | — | — | — | — | Prompt and response share the 1M-token context window |
| Image | — | URL, base64, Uint8Array | — | — | Sent as image parts in messages; counts as input tokens |
| — | URL, base64, Uint8Array | — | — | Sent as file parts in messages; counts as input tokens |
Provider options
Set AI Gateway routing options under providerOptions.gateway. For provider-specific options, pass them under the provider’s namespace as documented by the AI SDK.
Learn more in the AI SDK xai provider docs.
import { generateText } from 'ai';import 'dotenv/config';
async function main() { const result = await generateText({ model: 'spacexai/grok-4.1-fast-non-reasoning', prompt: 'Why is the sky blue?', providerOptions: { gateway: { only: ['vertex'], }, }, });
console.log(result.text);}
main().catch(console.error);These AI Gateway routing options apply to every model. Provider-specific options pass through under the provider’s own namespace (for example providerOptions.anthropic) exactly as documented by the AI SDK.
| Parameter | Type | Required | Description |
|---|---|---|---|
providerOptions.gateway.only | string[] | No | Restrict routing to these provider slugs. Requests fail over only within the listed providers. |
providerOptions.gateway.order | string[] | No | Preferred provider order. Listed providers are tried first; unlisted providers remain available as fallbacks. |
providerOptions.gateway.sort | 'cost' | 'ttft' | 'tps' | No | Rank candidate providers by price, time to first token, or tokens per second instead of the default routing order. |
providerOptions.gateway.zeroDataRetention | boolean | No | Route only to providers with a zero-data-retention policy for this model. |
Routing across providers
AI Gateway serves the same model through multiple providers and fails over automatically. order expresses a preference while keeping every provider eligible; only is a hard allowlist — if none of the listed providers are available the request fails instead of falling back.
Options under a provider's own namespace (for example providerOptions.anthropic) are forwarded to that provider with the request. Providers ignore option namespaces that don't apply to them, so it is safe to set provider options alongside gateway routing options.
Image input
Send images alongside text as message parts. Images count as input tokens.
import { generateText } from 'ai';import 'dotenv/config';
async function main() { const result = await generateText({ model: 'spacexai/grok-4.1-fast-non-reasoning', messages: [ { role: 'user', content: [ { type: 'text', text: 'Describe this image.' }, { type: 'image', image: 'https://example.com/photo.jpg' }, ], }, ], });
console.log(result.text);}
main().catch(console.error);PDF input
Attach PDFs as file parts. Their contents count as input tokens.
import { generateText } from 'ai';import 'dotenv/config';
async function main() { const result = await generateText({ model: 'spacexai/grok-4.1-fast-non-reasoning', messages: [ { role: 'user', content: [ { type: 'text', text: 'Summarize this document.' }, { type: 'file', mediaType: 'application/pdf', data: 'https://example.com/document.pdf', }, ], }, ], });
console.log(result.text);}
main().catch(console.error);Tool calling
Expose tools the model can call. Define each tool’s inputs with a Zod schema.
import { generateText, tool } from 'ai';import { z } from 'zod';import 'dotenv/config';
async function main() { const result = await generateText({ model: 'spacexai/grok-4.1-fast-non-reasoning', prompt: 'What is the weather in San Francisco?', tools: { getWeather: tool({ description: 'Get the current weather for a location', inputSchema: z.object({ location: z.string() }), execute: async ({ location }) => ({ location, temperatureC: 18 }), }), }, });
console.log(result.text);}
main().catch(console.error);Copy link to headingMore models by SpaceXAI
| Model |
|---|
| 500K | $2/M+1 more | $6/M+1 more | Read$0.50/M | $5/K | +1 | | 08/12/2026 | |||||||
| 500K | $2/M+1 more | $6/M+1 more | Read$0.30/M | $5/K | +3 | | 07/08/2026 | |||||||
| 1M | $1.25/M+1 more | $2.50/M+1 more | Read$0.20/M | $5/K | +3 |  | 04/30/2026 | |||||||
| 2M | $1.25/M+1 more | $2.50/M+1 more | Read$0.20/M | $5/K | +2 | | 03/10/2026 | |||||||
| 2M | $1.25/M+1 more | $2.50/M+1 more | Read$0.20/M | $5/K | +3 | | 03/10/2026 | |||||||
| 1M | $0.20/M | $0.50/M | Read$0.05/M | — | +2 | | 11/19/2025 |
Copy link to headingAbout Grok 4.1 Fast Non-Reasoning
Grok 4.1 Fast Non-Reasoning was released November 19, 2025 as part of SpaceXAI'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 spacexai/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 SpaceXAI account is required.
Copy link to headingWhat To Consider When Choosing a Provider
- Configuration: Grok 4.1 Fast Non-Reasoning is specifically tuned for tool-calling patterns. It excels at structured decision-making in agent loops but may not match reasoning-focused models on complex analytical tasks.
- Configuration: The context window of 1M tokens supports extensive tool schemas, conversation histories, and retrieved documents within a single agent session without truncation.
- Zero Data Retention: Zero Data Retention is available for this model. It is offered on a per-provider and model basis. See the documentation for details.
- Authentication: AI Gateway authenticates requests using an API key or OIDC token. You do not need to manage provider credentials directly.
Copy link to headingWhen to Use Grok 4.1 Fast Non-Reasoning
Best for
- Agentic tool-calling workflows: The model repeatedly decides which tools to invoke and processes their results
- Multi-step automation pipelines: That orchestrate external APIs, databases, and services through function calling
- High-throughput agent deployments: Per-step latency directly impacts total workflow completion time
- RAG applications with large retrieval contexts: That benefit from the context window of 1M tokens
- Production agent systems: Requiring fast, deterministic tool selection without reasoning overhead
Consider alternatives when
- Tasks requiring analytical reasoning: The Grok 4.1 Fast Reasoning variant provides better accuracy through chain-of-thought
- Hardest problem sets: Grok 4.1 Fast Reasoning offers deeper chain-of-thought reasoning
- Simple text tasks without tool use: Grok 3 Mini Fast offers lower cost for basic language operations
Copy link to headingConclusion
Grok 4.1 Fast Non-Reasoning is purpose-built for the agent era: fast tool calling, massive context, and no reasoning overhead. For teams building agentic systems that make many model calls per workflow, it provides the speed and efficiency that keep agent loops practical at production scale.
Copy link to headingFrequently Asked Questions
What makes Grok 4.1 Fast Non-Reasoning different from Grok 4 Fast Non-Reasoning?
Grok 4.1 Fast Non-Reasoning is the next iteration, specifically optimized for agentic tool-calling operations with an expanded context window of 1M tokens. It builds on the Grok 4 Fast foundation with improved tool-use capabilities.
What is the context window for Grok 4.1 Fast Non-Reasoning?
1M tokens, supporting extensive tool schemas, conversation histories, and retrieved documents within a single request.
What does 'non-reasoning' mean?
The model produces direct responses without generating chain-of-thought reasoning traces. This reduces latency and output token cost, which is ideal for agentic loops where speed matters.
What does Grok 4.1 Fast Non-Reasoning cost?
Check the pricing panel on this page for today's numbers. AI Gateway tracks rates across every provider that serves Grok 4.1 Fast Non-Reasoning.
How do I authenticate with Grok 4.1 Fast Non-Reasoning through Vercel AI Gateway?
Use your Vercel AI Gateway API key with
spacexai/grok-4.1-fast-non-reasoningas the model identifier. No separate SpaceXAI account is needed for gateway-managed access.Is Grok 4.1 Fast Non-Reasoning suitable for non-agentic tasks?
Yes, it handles general text tasks well. However, its design is optimized for agentic tool-calling patterns. For pure text generation or analytical reasoning, other Grok variants may be better suited.
Does Vercel AI Gateway support Zero Data Retention for Grok 4.1 Fast Non-Reasoning?
Yes, Zero Data Retention is 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.