One base URL. 600+ models.

# pip install openai
from openai import OpenAI
client = OpenAI(
    base_url="https://api.cheaperllm.com/v1",
    api_key="YOUR_KEY"
)
resp = client.chat.completions.create(
    model="gpt-4o",  # or "claude-sonnet-4-5"
    messages=[{"role":"user",
               "content":"Hello!"}]
)
print(resp.choices[0].message.content)

// npm install openai
import OpenAI from "openai";
const client = new OpenAI({
  baseURL: "https://api.cheaperllm.com/v1",
  apiKey: "YOUR_KEY",
});
const resp = await client.chat.completions.create({
  model: "gpt-4o",
  messages: [{ role: "user",
               content: "Hello!" }],
});
console.log(resp.choices[0].message.content);

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