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Very High Reasoning

Phi 4 Reasoning Plus

Phi-4 Reasoning Plus is Microsoft's powerful 14-billion parameter AI model that delivers advanced chain-of-thought reasoning, excelling in math, science, and complex coding tasks with transparent, step-by-step explanations. Outperforming much larger models on key benchmarks, it's openly available under MIT license for efficient deployment on everyday hardware.

32k Context
Very High Intelligence
Mar '25 Knowledge

Available for Chat, Vision, and File Uploads.

Performance Benchmarks

HumanEval+
92.3%
MMLU-Pro
76.0%
IFEval
84.9%

How do you want to interact?

Start a Conversation

Ask anything.
Have a natural conversation, brainstorm ideas, draft emails, or ask for advice.

Start Chatting

Use a Persona

Specialized Experts.
Instruct the AI to act as a Coding Tutor, Marketing Expert, or Travel Guide.

Pick a Persona

Why use Phi 4 Reasoning Plus?

Advanced Reasoning

Generates detailed chain-of-thought traces with 1.5× more tokens than base models to solve complex math, science, and coding problems

Extended Context

Supports 32,768 token context window with experimental support for 64k tokens, enabling coherence over lengthy multi-step reasoning sequences

Efficient Performance

Achieves competitive results with models 47× larger, delivering performance comparable to DeepSeek-R1 (671B parameters) on specialized benchmarks like AIME 2025

Capability Examples

Math Reasoning Challenge
Solve this: If a train leaves at 60 mph and another at 80 mph from stations 300 miles apart, when do they meet if heading towards each other?
Reasoning Chain: Distance = 300 miles. Relative speed = 60 + 80 = 140 mph. Time = 300 / 140 ≈ 2.143 hours, or 2 hours 8.57 minutes. Final Answer: They meet after approximately 2 hours and 9 minutes.
Code Debugging Task
Debug this Python code: def factorial(n): if n == 0: return 1 else: return n factorial(n - 1) print(factorial(-5))
Reasoning Chain: Code computes factorial recursively, correct for n >= 0. Issue: negative input -5 causes infinite recursion (no base case). Fix: Add check for n < 0, return error or 0. Corrected: def factorial(n): if n < 0: raise ValueError("Negative input") if n == 0: return 1 return n factorial(n - 1). Final Answer: Added negative check to prevent recursion error.

How to use

1
Go to Chat

Navigate to the "AI Chat" page.

2
Select Model

Ensure Phi 4 Reasoning Plus is selected.

3
Type Prompt

Ask a question or paste code.

4
Interact

Refine the answer by replying to the AI.

Compare LLMs Side-by-Side

Is Phi 4 Reasoning Plus better than Claude 3.5 or Gemini? Test same prompts simultaneously in the Chat Playground.

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