Grok 4.1 Fast

Grok 4.1 Fast is xAI's best tool-calling model with a 1M context window. It completes agentic tasks accurately and rapidly without extended thinking, excelling at complex real-world use cases such as customer support and finance.

Context 1M·Max out 30K

Quickstart

import { streamText } from 'ai';
import { createOpenAICompatible } from '@ai-sdk/openai-compatible';

const blackbox = createOpenAICompatible({
  name: 'blackbox',
  apiKey: process.env.BLACKBOX_API_KEY!,
  baseURL: 'https://api.blackbox.ai/v1',
});

const result = streamText({
  model: blackbox('blackboxai/x-ai/grok-4.1-fast-non-reasoning'),
  prompt: 'Why is the sky blue?',
});

for await (const chunk of result.textStream) {
  process.stdout.write(chunk);
}

Specs & pricing

Input $/M: 0.2
Output $/M: 0.5
Context window: 1M
Max output: 30K
Supported parameters: tool-usevisionstreamingweb-search

Related models

Model	Type	Context	Input $/M
Grok 4.3	Text	1M	1.25
Grok Build 0.1	Text	256K	1
Grok 4.1 Fast Non-Reasoning	Text	1M	0.2
Grok 4.1 Fast Reasoning	Text	1M	0.2
Grok 4.20 Multi-Agent	Text	—	1.25