Using Grok 4 Fast Reasoning on Microsoft Foundry

Implementation guide · Grok 4 · xAI

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Microsoft Foundry exposes Grok 4 Fast Reasoning through model ID grok-4-fast-reasoning. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-07-09. 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-fast-reasoning — see the documentation for request format.
API PortalDocumentationPricingModel Card

Code Examples

See Microsoft Foundry documentation for integration details.

Pricing on Microsoft Foundry

Capabilities

VisionMultimodalReasoning

About Grok 4 Fast Reasoning

Grok 4 Fast Reasoning is a September 2025 xAI model retiring on 2026-05-15; use Grok 4.3 for current API work.

Full model details →

Model Specs

Released2025-09-01
Context2m
ArchitectureDecoder Only

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Also available on(1)

xAI Console$1.25/1M
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Provider

Microsoft Foundry

Microsoft

Redmond, Washington, United States