💥 Use Microsoft’s Phi-4 Reasoning+ for FREE — Solve Complex Problems Like a Genius (in 20 Lines of Python)

No credit card. No waitlist. Just raw reasoning power. Microsoft quietly released one of the smartest logic AIs on the planet — and you can use it right now for free.

🤯 What Is Phi-4 Reasoning+?

Microsoft’s Phi-4 Reasoning+ is an advanced AI model focused on math, logic, and structured reasoning. It’s surprisingly small (14B parameters) but punches way above its weight class.

Think: ✔️ Better at solving equations than GPT-3.5 ✔️ Snappy logic responses ✔️ Free and open via **OpenRouter**

🚀 Let’s Use It — In Just 3 Steps

We’ll write a Python script that sends your question to the Phi-4 Reasoning Plus model via OpenRouter and streams the response in real-time.

🛠️ Step 1: Get a Free OpenRouter API Key

1. Go to openrouter.ai
2. Sign in with Google or GitHub
3. Head to https://openrouter.ai/keys
4. Copy your API key — looks like sk-or-v1-xxxxxxxxxxxxxxxx

✅ You now have access to tons of AI models — including Phi-4.

🧠 Step 2: Ask the Model Anything (with Python)

Here’s the full script to query Phi-4 Reasoning+ and stream the reply:

import requests
import json

key = 'your-api-key-here'  # Replace this with your actual key
question = "solve x+y=10 and x-y=7 find x and y"

url = "https://openrouter.ai/api/v1/chat/completions"
headers = {
  "Authorization": f"Bearer {key}",
  "Content-Type": "application/json"
}

payload = {
  "model": "microsoft/phi-4-reasoning-plus:free",
  "messages": [
    {"role": "system", "content": "you are dalton"},
    {"role": "user", "content": question}
  ],
  "stream": True
}

buffer = ""
with requests.post(url, headers=headers, json=payload, stream=True) as r:
  for chunk in r.iter_content(chunk_size=1024, decode_unicode=True):
    buffer += chunk
    while True:
      line_end = buffer.find('\n')
      if line_end == -1:
        break
      line = buffer[:line_end].strip()
      buffer = buffer[line_end + 1:]

      if line.startswith('data: '):
        data = line[6:]
        if data == '[DONE]':
          break
        try:
          data_obj = json.loads(data)
          content = data_obj["choices"][0]["delta"].get("content")
          if content:
            print(content, end="", flush=True)
        except json.JSONDecodeError:
          pass

🎯 What You Just Did:

• Sent a prompt to Microsoft Phi-4 Reasoning Plus
• Got a streamed answer (as it’s being generated)
• Solved a system of equations live

🧠 Why Phi-4 Is a Big Deal

Unlike massive chatbots that “hallucinate,” Phi-4 excels at structured thinking. It’s:

• Lightweight
• Transparent
• Free to experiment with
• Surprisingly smart

And it’s only going to get better.

✅ Wrap-up

🔑 You now know how to use one of Microsoft’s smartest AI tools — with just Python and a free API.

Found this useful? Clap 👏, follow 💬, and share with a fellow builder. I’ll keep dropping free AI tools you actually want to use.

Drop a comment: What will you build with Phi-4?