Grok 4.1 Fast
Built by xAI, Grok 4.1 Fast is an image-generation model with a 2000K token context window. Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using...
by xAI · 2000K token context window
Best for
- image generation from text
- creative design and ideation
Ways to use Grok 4.1 Fast in osFoundry
Connect with your own key (BYOK)
Open the key dialog and paste your xAI API key. osFoundry discovers Grok 4.1 Fast automatically — assign it to a Maestro role (router, direct, orchestrator, or fallback) in the Pipeline tab and it is live in every chat. Your key, your provider account — no token markup.
Use it in a Room App
Room Apps declare AI features in their manifest, then call them with invokeAI:
import { invokeAI } from '@osfoundry/app-sdk'
// 'summarize' is an AI feature declared in your app manifest.
const result = await invokeAI('summarize', userText)
Call it from your own apps
Once a model is wired into your workspace you can host it as an API and reach it from your own services, scripts, or CI — outside osFoundry.
Grok 4.1 Fast vs similar models
Licence
Hosted — usage subject to provider terms — Hosted-only model — usage governed by the provider's API terms. Bring your own provider key.
No weights distributed; usage subject to provider terms.
Frequently asked about Grok 4.1 Fast
How much does Grok 4.1 Fast cost?
Grok 4.1 Fast is metered at $ 0.200 /1M for input, and $ 0.500 /1M for output. Bring your own xAI API key — osFoundry passes through provider pricing without markup.
Can I use Grok 4.1 Fast commercially?
Commercial use is allowed with conditions. Hosted-only model — usage governed by the provider's API terms. Bring your own provider key. No weights distributed; usage subject to provider terms.
What is the context window of Grok 4.1 Fast?
Grok 4.1 Fast supports a 2000K token context window.
Can I run Grok 4.1 Fast locally?
No — Grok 4.1 Fast is hosted only and accessed via the xAI API.
What is Grok 4.1 Fast best at?
Grok 4.1 Fast is well-suited to image generation from text, creative design and ideation.
How do I use Grok 4.1 Fast in osFoundry?
Paste your xAI API key in the key dialog (or deploy the open weights for self-hostable models), assign Grok 4.1 Fast to a Maestro role in the Pipeline tab, then use it in chat, Room Apps via invokeAI, or your own apps.
Published by xAI on November 19, 2025. Source: https://openrouter.ai/x-ai/grok-4.1-fast