OpenAI-compatible Claude API

How to migrate from OpenAI to Claude

If your application already uses the OpenAI SDK, migrating to Claude takes exactly two changes:

1. 1Change base_url to https://api.lumosel.vip
2. 2Change model to a Claude model ID like claude-opus-4-8

Code examples

# pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://api.lumosel.vip/v1",
    api_key="YOUR_API_KEY",
)

response = client.chat.completions.create(
    model="claude-opus-4-8",
    messages=[{"role": "user", "content": "Hello, Claude"}],
)
print(response.choices[0].message.content)

// npm install openai
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.lumosel.vip/v1",
  apiKey: "YOUR_API_KEY",
});

const response = await client.chat.completions.create({
  model: "claude-opus-4-8",
  messages: [{ role: "user", content: "Hello, Claude" }],
});
console.log(response.choices[0].message.content);

curl https://api.lumosel.vip/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "claude-opus-4-8",
    "messages": [{"role": "user", "content": "Hello, Claude"}]
  }'

What works

For full Claude API features (tool use, vision, prompt caching, token counting), use the Anthropic Messages API endpoint.