phi‑4-reasoning Blog

What is Phi‑4 Reasoning & How does it Work?
Mar 19, 2026
Microsoft
phi‑4-reasoning

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