Phi-4 Reasoning

In plain words

Phi-4 Reasoning is a pair of open-weight language models in 3.8B and 14B sizes designed to deliver strong reasoning capabilities for mathematics, science, and code tasks. Despite their small size, these models rival larger language models in performance. Available through Azure AI Foundry and Hugging Face, Phi-4 Reasoning targets developers and researchers seeking efficient reasoning models for technical applications.

written from the facts on this page · September 2026

From the sources

Small open-weight models (3.8B/14B) delivering powerful reasoning for math/science/code, rivaling larger LLMs. Available on Azure AI Foundry & HF.

Microsoft continues to add to the conversation by unveiling its newest models, Phi-4-reasoning, Phi-4-reasoning-plus, and Phi-4-mini-reasoning. Learn more.

One year ago, Microsoft introduced small language models (SLMs) to customers with the release of Phi-3 on Azure AI Foundry , leveraging research on SLMs to expand the range of efficient AI models and tools available to customers. Today, we are excited to introduce Phi-4-reasoning, Phi-4-reasoning-plus, and Phi-4-mini-reasoning —marking a new era for small language models and once again redefining what is possible with small and efficient AI. Find the ideal model for your business needs, then tinker, tweak, and customize within a project to achieve all your AI goals. Reasoning models are trained to leverage inference-time scaling to perform complex tasks that demand multi-step decomposition…from azure.microsoft.com

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