Microsoft: Phi 4 Reasoning Plus

by Microsoft

Phi-4-reasoning-plus is an enhanced 14B parameter model from Microsoft, fine-tuned from Phi-4 with additional reinforcement learning to boost accuracy on math, science, and code reasoning tasks. It uses the same dense decoder-only transformer architecture as Phi-4, but generates longer, more comprehensive outputs structured into a step-by-step reasoning trace and final answer. While it offers improved benchmark scores over Phi-4-reasoning across tasks like AIME, OmniMath, and HumanEvalPlus, its responses are typically ~50% longer, resulting in higher latency. Designed for English-only applications, it is well-suited for structured reasoning workflows where output quality takes priority over response speed.

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Pricing

$0.07

input

$0.35

output

per 1M tokens

Context

33K

tokens

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Other Models from Microsoft

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Model	Score	Latency	Cost/1M
Microsoft: Phi 4 Multimodal Instruct	—	—	$0.07
Microsoft: Phi 4	—	—	$0.10
WizardLM-2 8x22B	—	—	$0.48

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const openrouter = new OpenRouter({
  apiKey: "<OPENROUTER_API_KEY>"
});

const completion = await openrouter.chat.completions.create({
  model: "microsoft/phi-4-reasoning-plus",
  messages: [
    {
      role: "user",
      content: "Hello!"
    }
  ]
});

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