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The chat completion chunk object

Represents a streamed chunk of a chat completion response returned by model, based on the provided input.source

id

stringsource

A unique identifier for the chat completion. Each chunk has the same ID.source

choices

arraysource

A list of chat completion choices. Can contain more than one elements if n is greater than 1. Can also be empty for the last chunk if you set stream_options: {"include_usage": true}.source

created

integersource

The Unix timestamp (in seconds) of when the chat completion was created. Each chunk has the same timestamp.source

model

stringsource

The model to generate the completion.source

service_tier

string or nullsource

The service tier used for processing the request. This field is only included if the service_tier parameter is specified in the request.source

system_fingerprint

stringsource

This fingerprint represents the backend configuration that the model runs with. Can be used in conjunction with the seed request parameter to understand when backend changes have been made that might impact determinism.source

object

stringsource

The object type, which is always chat.completion.chunk.source

usage

object or nullsource

An optional field that will only be present when you set stream_options: {"include_usage": true} in your request. When present, it contains a null value except for the last chunk which contains the token usage statistics for the entire request.source

OBJECT The chat completion chunk object
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{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-4o-mini", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"role":"assistant","content":""},"logprobs":null,"finish_reason":null}]}

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-4o-mini", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{"content":"Hello"},"logprobs":null,"finish_reason":null}]}

....

{"id":"chatcmpl-123","object":"chat.completion.chunk","created":1694268190,"model":"gpt-4o-mini", "system_fingerprint": "fp_44709d6fcb", "choices":[{"index":0,"delta":{},"logprobs":null,"finish_reason":"stop"}]}