Using Phi 4 Reasoning Plus on Microsoft Foundry

Implementation guide · Phi-4 · Microsoft Research

ServerlessOpen Source

Microsoft Foundry exposes Phi 4 Reasoning Plus through model ID microsoft:phi4reasoningplus. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-06-04. Next refresh: weekly.

Quick Start

1
Create an account at Microsoft Foundry and generate an API key.
2
Use the Microsoft Foundry SDK or REST API to call microsoft:phi4reasoningplus — see the documentation for request format.
3
You'll be billed $0.13/1M input, $0.50/1M output tokens. See full pricing.

API Portal Documentation Pricing Model Card

Code Examples

See Microsoft Foundry documentation for integration details.

Pricing on Microsoft Foundry

Type	Price (per 1M)
Input tokens	$0.13
Output tokens	$0.50

Capabilities

Reasoning

About Phi 4 Reasoning Plus

Phi 4 Reasoning Plus is Microsoft Research's Phi-4 model focused on step-by-step reasoning. It offers a 128K-token context window with weights openly available for self-hosting and scores 68.9 on GPQA.

Full model details →

Model Specs

Released2025-01-01

Parameters14B

Context128k

ArchitectureDecoder Only

Knowledge cutoff2025-03

Microsoft

Redmond, Washington, United States