curl -X POST https://neuralhubapi.com/v1/chat/completions \
 -H "Content-Type: application/json" \
 -H "Authorization: Bearer YOUR_API_KEY" \
 -d '{
   "model": "google/gemini-2.5-flash",
   "messages": [
     {"role": "system", "content": "You are a helpful assistant."},
     {"role": "user", "content": "What is the answer to life, the universe, and everything?"}
   ],
   "temperature": 0.7,
   "max_tokens": 500,
   "top_p": 0.9
 }'