Keep your client. Change the route.

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["AIWAVE_API_KEY"],
    base_url="https://aiwave.live/v1",
)
response = client.chat.completions.create(
    model="deepseek-v4-flash",
    messages=[{"role": "user", "content": "Reply with OK."}],
)
print(response.choices[0].message.content)

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.AIWAVE_API_KEY,
  baseURL: "https://aiwave.live/v1",
});

const response = await client.chat.completions.create({
  model: "deepseek-v4-flash",
  messages: [{ role: "user", content: "Reply with OK." }],
});
console.log(response.choices[0].message.content);

curl https://aiwave.live/v1/chat/completions \
  -H "Authorization: Bearer $AIWAVE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"deepseek-v4-flash","messages":[{"role":"user","content":"Reply with OK."}]}'