curl --request POST \
  --url https://api.sierra.absconsulting.com/v1/chat/completions \
  --header 'Api-Key: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "messages": [
    {
      "content": "<string>",
      "role": "system"
    }
  ],
  "model": "<string>"
}
'

{
  "choices": [
    {
      "delta": {
        "content": "<string>",
        "role": "system"
      },
      "finish_reason": "<string>",
      "index": 123,
      "message": {
        "content": "<string>",
        "role": "system"
      }
    }
  ],
  "created": 123,
  "id": "<string>",
  "model": "<string>",
  "object": "<string>",
  "usage": {
    "completion_tokens": 123,
    "prompt_tokens": 123,
    "total_tokens": 123
  }
}