# Grok 4.1 Fast Non-Reasoning

Grok 4.1 Fast Non-Reasoning is engineered for agentic tool-calling operations, delivering direct responses without reasoning overhead across a context window of 1M tokens.

- **Model ID:** `spacexai/grok-4.1-fast-non-reasoning`
- **Type:** chat
- **Providers:** vertex
- **Context window:** 1,000,000
- **Maximum output tokens:** 1,000,000
- **Pricing:** $0.2/1M input tokens, $0.5/1M output tokens
- **Canonical page:** https://vercel.com/ai-gateway/models/grok-4.1-fast-non-reasoning

## Supported parameters

Detailed capability metadata has not been reported for this model.

## Example

```ts
import { streamText } from 'ai'

const result = streamText({
  model: 'spacexai/grok-4.1-fast-non-reasoning',
  prompt: 'Why is the sky blue?'
})
```

## About

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.

## What to consider

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.

The context window of 1M tokens supports extensive tool schemas, conversation histories, and retrieved documents within a single agent session without truncation.

## When to use

### Best For

- **Agentic tool-calling workflows** where 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** where 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** where the Grok 4.1 Fast Reasoning variant provides better accuracy through chain-of-thought
- **Hardest problem sets** where Grok 4.1 Fast Reasoning offers deeper chain-of-thought reasoning
- **Simple text tasks without tool use** where Grok 3 Mini Fast offers lower cost for basic language operations

## 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

- **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

## Frequently 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-reasoning` as 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.

## Links

- [Model page](https://vercel.com/ai-gateway/models/grok-4.1-fast-non-reasoning)
- [AI Gateway documentation](https://vercel.com/docs/ai-gateway)
- [Provider model documentation](https://docs.cloud.google.com/vertex-ai/generative-ai/docs/partner-models/grok/grok-4-1-fast)