// Node.js / Browser
const res = await fetch('https://api.xah.io/v1/chat/completions', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    "model": "azzzazzz/thinkingJack4",
    "messages": [
        {
            "role": "user",
            "content": "Привет, кто ты?"
        }
    ]
})
});
const data = await res.json();
console.log(data);

import json, requests

url = 'https://api.xah.io/v1/chat/completions'
headers = {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json',
}
payload = json.loads("{\n    \"model\": \"azzzazzz/thinkingJack4\",\n    \"messages\": [\n        {\n            \"role\": \"user\",\n            \"content\": \"Привет, кто ты?\"\n        }\n    ]\n}")

res = requests.post(url, headers=headers, json=payload, timeout=120)
print(res.status_code, res.json())

{
    "model": "azzzazzz/thinkingJack4",
    "messages": [
        {
            "role": "user",
            "content": "Привет, кто ты?"
        }
    ]
}