curl --request POST \
  --url https://api.ttapi.io/v1/chat/completions \
  --header 'Content-Type: application/json' \
  --header 'TT-API-KEY: <api-key>' \
  --data '
{
  "messages": [
    {
      "role": "system",
      "content": "You are a helpful assistant."
    },
    {
      "role": "user",
      "content": "Hello!"
    }
  ],
  "model": "<string>",
  "...": "<unknown>"
}
'

{
  "id": "chatcmpl-9ugiTupGJUmeRNqyqUvYO34GOUzyv",
  "object": "chat.completion",
  "created": 1723297597,
  "model": "gpt-3.5-turbo-0125",
  "choices": [
    {
      "index": 0,
      "message": {
        "content": "你好！有什么可以帮助你的吗？",
        "role": "assistant",
        "refusal": null
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 11,
    "completion_tokens": 17,
    "total_tokens": 28
  }
}