Chat Completions 对象块

Chat Completions 对象块（chunk） 主要用于流模式（streaming）时的模型输出。

参数	类型	描述
id	string	聊天完成的唯一标识符。每个块具有相同的ID
choices	array	聊天完成选项列表。如果n大于1,可以有多个选项
created	integer	创建聊天完成的Unix时间戳(秒)。每个块具有相同的时间戳
model	string	生成完成的模型
system_fingerprint	string	该指纹表示模型运行的后端配置
object	string	对象类型,总是 chat.completion.chunk

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-4.1", "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-4.1", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"content":"Hello"},"finish_reason":null}]}

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-4.1", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"content":"!"},"finish_reason":null}]}

....

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-4.1", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"content":" today"},"finish_reason":null}]}

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-4.1", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"content":"?"},"finish_reason":null}]}

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-4.1", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{},"finish_reason":"stop"}]}