> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tokensmind.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# ChatGPT chat completions

## Response object

| Field               | Type    | Description                             |
| ------------------- | ------- | --------------------------------------- |
| id                  | string  | Unique id for the chat completion       |
| choices             | array   | Completion choices; multiple if `n` > 1 |
| created             | integer | Unix timestamp (seconds)                |
| model               | string  | Model used                              |
| system\_fingerprint | string  | Backend configuration fingerprint       |
| object              | string  | Always `chat.completion`                |
| usage               | object  | Token usage for this request            |
| completion\_tokens  | integer | Tokens in the completion                |
| prompt\_tokens      | integer | Tokens in the prompt                    |
| total\_tokens       | integer | Total tokens (prompt + completion)      |

```JSON theme={null}
{
  "id": "chatcmpl-123",
  "object": "chat.completion",
  "created": 1677652288,
  "model": "gpt-3.5-turbo-0613",
  "system_fingerprint": "fp_44709d6fcb",
  "choices": [{
    "index": 0,
    "message": {
      "role": "assistant",
      "content": "\n\nHello there, how may I assist you today?",
    },
    "finish_reason": "stop"
  }],
  "usage": {
    "prompt_tokens": 9,
    "completion_tokens": 12,
    "total_tokens": 21
  }
}
```

## Chat completion chunk object

| Field               | Type    | Description                             |
| ------------------- | ------- | --------------------------------------- |
| id                  | string  | Same id across chunks in one completion |
| choices             | array   | Streaming choices; multiple if `n` > 1  |
| created             | integer | Same timestamp across chunks            |
| model               | string  | Model generating the stream             |
| system\_fingerprint | string  | Backend fingerprint                     |
| object              | string  | Always `chat.completion.chunk`          |

```JSON theme={null}
{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-3.5-turbo-0613", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":null}]}

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-3.5-turbo-0613", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"content":"Hello"},"finish_reason":null}]}

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-3.5-turbo-0613", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"content":"!"},"finish_reason":null}]}

....

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-3.5-turbo-0613", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"content":" today"},"finish_reason":null}]}

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-3.5-turbo-0613", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"content":"?"},"finish_reason":null}]}

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-3.5-turbo-0613", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{},"finish_reason":"stop"}]}
```