Using Grok 4.1 Fast on Microsoft Foundry

Implementation guide · Grok 4 · xAI

Serverless

Microsoft Foundry exposes Grok 4.1 Fast through model ID grok-4.1-fast-reasoning. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-10-18. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at Microsoft Foundry and generate an API key.
  2. 2
    Use the Microsoft Foundry SDK or REST API to call grok-4.1-fast-reasoning — see the documentation for request format.
  3. 3
    You'll be billed $0.20/1M input, $0.50/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

See Microsoft Foundry documentation for integration details.

Pricing on Microsoft Foundry

TypePrice (per 1M)
Input tokens$0.20
Output tokens$0.50

Capabilities

VisionMultimodalReasoningJSON / Tool useStructured Outputs

About Grok 4.1 Fast

Ultra-low latency Grok 4.1 Fast API family. xAI retired grok-4-1-fast-reasoning and grok-4-1-fast-non-reasoning on 2026-05-15; requests now redirect to Grok 4.3 at Grok 4.3 pricing.

Full model details →

Model Specs

Released2025-11-19
Context2M

More Models on Microsoft Foundry

Grok 4Grok 4 Fast ReasoningGrok 4 Fast Non-ReasoningGrok 4.3Grok Code Fast 1
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Also available on(4)

OpenRouter$0.20/1MGCP Vertex AI$0.20/1MVercel AI Gateway$0.20/1M
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Provider

Microsoft Foundry

Microsoft

Redmond, Washington, United States