xAI: Grok 4.1 Fast

Name: Grok 4.1 Fast API
Brand: Xai

stable

Grok 4.1 Fast is available through Everstack's OpenAI-compatible gateway with routing, fallback, retries, and observability.

grok-4-1-fastgrok

Provider Quick start

Context

tokens

Max output

30K

tokens

Input

$0.20

per 1M

Output

$0.50

per 1M

Activity

Daily period usage

Aggregated managed Everstack traffic. Buckets below 5 tenants or 100 requests are withheld.

Providers

ProviderContextInput /MOutput /M

xAI

2M$0.20$0.50

Pricing

Item	Price	Unit
Input	$0.20	per 1M tokens
Output	$0.50	per 1M tokens

Performance

Reliability

Compare

Compare usage and performance

Place this model beside up to three other catalog models.

Capabilities

Modalities

Input

Output

Details

Model ID: grok-4-1-fast
Family: grok
Status: stable
Knowledge: -
Released: -

Gateway Config

API: 2024-01-01
Auth: XAI_API_KEY
Discovery: static
Provider type: static

Quick Start

index.ts

import Everstack from "@everstack/node";const client = new Everstack({  apiKey: process.env.EVERSTACK_API_KEY!,  baseUrl: "https://{instance}.{region}.everstack.ai",});const completion = await client.chat.completions.create({  model: "@xai/grok-4-1-fast",  messages: [{ role: "user", content: "Explain vector cache routing." }],});console.log(completion.choices[0]?.message?.content);

Endpoint

Base URL

https://api.x.ai/v1

Chat completions

https://api.x.ai/v1/chat/completions

Model

grok-4-1-fast

Auth env

XAI_API_KEY

Grok 4.1 Fast FAQ

How much does the Grok 4.1 Fast API cost?

Through xAI, Grok 4.1 Fast costs $0.20 per 1M input tokens and $0.50 per 1M output tokens.

What is the context window of Grok 4.1 Fast?

Grok 4.1 Fast accepts up to 2M tokens of context and returns up to 30K output tokens on xAI.

What can Grok 4.1 Fast do?

Grok 4.1 Fast supports chat, function calling, image input and reasoning. It accepts text and image input.

How do I call Grok 4.1 Fast through Everstack?

Point any OpenAI-compatible SDK at your Everstack gateway and set the model to @xai/grok-4-1-fast. Everstack adds retries, provider fallback, caching, per-tenant budgets and OpenTelemetry traces for every request.