Microsoft Blog

What is Phi‑4 Reasoning & How does it Work?

What is Phi‑4 Reasoning & How does it Work?

Microsoft Research unveiled Phi‑4 Reasoning on April 30, 2025, alongside two sister models—Phi‑4‑Mini‑Reasoning (≈3.8 B parameters) and Phi‑4‑Reasoning‑Plus

Phi-4-mini API

Phi-4-mini API

Phi-4-Mini API represents Microsoft's latest innovation in small language models within the Phi-4 series, focusing primarily on text tasks. With a compact framework housing 3.8 billion parameters, Phi-4-Mini excels in speed and efficiency thanks to its dense decoder-only Transformer architecture.

Microsoft Phi-2 API

Microsoft Phi-2 API

Microsoft Phi-2 API, succinctly described, offers a seamless interface for integrating advanced natural language processing capabilities into diverse applications.