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Install Dependencies

pip install openai requests

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Basic Chat

from openai import OpenAI

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

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[
        {"role": "system", "content": "You are a helpful assistant."},
        {"role": "user", "content": "Explain artificial intelligence in one sentence"}
    ]
)

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

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Multi-turn Conversation

Maintain a messages list to implement multi-turn dialogue: 
from openai import OpenAI

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

messages = [
    {"role": "system", "content": "You are a Python programming assistant."}
]

def chat(user_input):
    messages.append({"role": "user", "content": user_input})

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

    reply = response.choices[0].message.content
    messages.append({"role": "assistant", "content": reply})
    return reply

# Multi-turn dialogue
print(chat("How do I read a CSV file?"))
print(chat("What if the file is very large?"))
print(chat("Can I use pandas for this?"))

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Streaming Output

from openai import OpenAI

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

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

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

​
Streaming with requests

import requests
import json

response = requests.post(
    "https://crazyrouter.com/v1/chat/completions",
    headers={
        "Authorization": "Bearer sk-xxx",
        "Content-Type": "application/json"
    },
    json={
        "model": "gpt-4o",
        "messages": [{"role": "user", "content": "Hello"}],
        "stream": True
    },
    stream=True
)

for line in response.iter_lines():
    if line:
        line = line.decode("utf-8")
        if line.startswith("data: ") and line != "data: [DONE]":
            data = json.loads(line[6:])
            content = data["choices"][0]["delta"].get("content", "")
            print(content, end="", flush=True)
print()
The model parameter in all examples can be replaced with any model supported by Crazyrouter, such as claude-sonnet-4-20250514, gemini-2.5-pro, etc.