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Mini toolsPhi 4 reasoning plus
By Microsoft
Model family: Phi
Phi-4-reasoning-plus is a state-of-the-art open-weight reasoning model finetuned from Phi-4 using supervised fine-tuning on a dataset of chain-of-thought traces and reinforcement learning. The supervised fine-tuning dataset includes a blend of synthetic prompts and high-quality filtered data from public domain websites, focused on math, science, and coding skills as well as alignment data for safety and Responsible AI. The goal of this approach was to ensure that small capable models were trained with data focused on high quality and advanced reasoning. Phi-4-reasoning-plus has been trained additionally with Reinforcement Learning, hence, it has higher accuracy but generates on average 50% more tokens, thus having higher latency.
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Overview
Phi-4-reasoning-plus is an open-weight reasoning model derived from Phi-4, trained with chain-of-thought supervised fine-tuning and extra reinforcement learning on high-quality synthetic and filtered public-domain data (math, science, coding) with safety alignment. It delivers stronger reasoning in a small model, at the cost of ~50% longer outputs and higher latency.
About Microsoft
Microsoft is a technology company that offers a wide range of software, cloud computing services, hardware, and artificial intelligence solutions.
Industry:
Software Development
Company Size:
228000+
Location:
Redmond, Washington, US
Website:
microsoft.com
Tools using Phi 4 reasoning plus
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Last updated: February 3, 2026
