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}.
The Unix timestamp (in seconds) of when the chat completion was created. Each chunk has the same timestamp.
A unique identifier for the chat completion. Each chunk has the same ID.
The model to generate the completion.
The object type, which is always chat.completion.chunk.
Optionalservice_The service tier used for processing the request. This field is only included if
the service_tier parameter is specified in the request.
Optionalsystem_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.
OptionalusageAn 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.
Represents a streamed chunk of a chat completion response returned by model, based on the provided input.