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license: mit
tags:
  - tutorial
  - crazyrouter
  - openai
  - api-gateway
  - getting-started
  - llm
language:
  - en
  - zh

🚀 Crazyrouter Getting Started Guide

One API key. 624+ AI models. OpenAI-compatible. Get started in 60 seconds.

What is Crazyrouter?

Crazyrouter is an AI API gateway. Instead of managing separate API keys for OpenAI, Anthropic, Google, DeepSeek, and dozens of other providers, you use one key to access them all.

It's fully OpenAI SDK compatible — just change the base_url and you're done.

Step 1: Get Your API Key

Go to crazyrouter.com
Sign up (free tier available)
Copy your API key (sk-...)

Step 2: Install the OpenAI SDK

pip install openai

That's it. No special SDK needed.

Step 3: Make Your First API Call

Python

from openai import OpenAI

client = OpenAI(
    base_url="https://crazyrouter.com/v1",
    api_key="sk-your-crazyrouter-key"
)

# Use any model — GPT-4o, Claude, Gemini, DeepSeek...
response = client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[
        {"role": "user", "content": "What is an API gateway?"}
    ]
)

print(response.choices[0].message.content)

cURL

curl https://crazyrouter.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-your-crazyrouter-key" \
  -d '{
    "model": "gpt-4o-mini",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

JavaScript / Node.js

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://crazyrouter.com/v1",
  apiKey: "sk-your-crazyrouter-key",
});

const response = await client.chat.completions.create({
  model: "gpt-4o-mini",
  messages: [{ role: "user", content: "Hello from Node.js!" }],
});

console.log(response.choices[0].message.content);

Step 4: Switch Models Instantly

The magic of Crazyrouter — switch between any model by changing one string:

# OpenAI
response = client.chat.completions.create(model="gpt-4o", messages=messages)

# Anthropic Claude
response = client.chat.completions.create(model="claude-sonnet-4-20250514", messages=messages)

# Google Gemini
response = client.chat.completions.create(model="gemini-2.0-flash", messages=messages)

# DeepSeek
response = client.chat.completions.create(model="deepseek-chat", messages=messages)

# DeepSeek R1 (reasoning)
response = client.chat.completions.create(model="deepseek-reasoner", messages=messages)

No SDK changes. No config changes. Just the model name.

Step 5: Streaming Responses

stream = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Write a short poem about coding"}],
    stream=True
)

for chunk in stream:
    content = chunk.choices[0].delta.content
    if content:
        print(content, end="", flush=True)

Step 6: List Available Models

models = client.models.list()
for model in models.data:
    print(model.id)

Or via cURL:

curl https://crazyrouter.com/v1/models \
  -H "Authorization: Bearer sk-your-crazyrouter-key"

Popular Models

Model	Provider	Best For
`gpt-4o`	OpenAI	General purpose, vision
`gpt-4o-mini`	OpenAI	Fast, cheap, good enough
`claude-sonnet-4-20250514`	Anthropic	Coding, analysis
`claude-haiku-3.5`	Anthropic	Fast, affordable
`gemini-2.0-flash`	Google	Speed, long context
`deepseek-chat`	DeepSeek	Cheap, strong coding
`deepseek-reasoner`	DeepSeek	Complex reasoning (R1)
`o3-mini`	OpenAI	Reasoning tasks

Environment Variables (Recommended)

export OPENAI_API_KEY="sk-your-crazyrouter-key"
export OPENAI_BASE_URL="https://crazyrouter.com/v1"

Then your code simplifies to:

from openai import OpenAI
client = OpenAI()  # Reads from env vars automatically

FAQ

Q: Is it really OpenAI-compatible? A: Yes. Any tool that works with the OpenAI API works with Crazyrouter. Just change the base URL.

Q: Is there a free tier? A: Yes. Sign up at crazyrouter.com to get started.

Q: How many models are available? A: 624+ models from 20+ providers, and growing.

Q: Can I use it with LangChain / LlamaIndex / AutoGen? A: Absolutely. See our LangChain guide.

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Crazyrouter-Getting-Started