curl --request POST \
  --url 'https://api.elkapi.com/v1/messages' \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "model": "claude-sonnet-4-6",
  "messages": [
    {
      "role": "user",
      "content": "こんにちは、自己紹介してください"
    }
  ],
  "max_tokens": 1024,
  "temperature": 1,
  "stream": false,
  "metadata": {
    "user_id": "user_id"
  }
}'

{
  "id": "id",
  "type": "message",
  "role": "user",
  "content": "こんにちは、自己紹介してください",
  "model": "claude-sonnet-4-6",
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 1,
    "output_tokens": 1,
    "cache_creation_input_tokens": 1,
    "cache_read_input_tokens": 1
  }
}