ChatGPT · Schema

ChatGPT Chat Completion

Schema for an OpenAI Chat Completion response object. Represents a chat completion generated by the model, including the generated message choices, token usage, and metadata.

AgentsAIChatGPTEmbeddingsFine-TuningGPT-4GPT-5Language ModelOpenAIRealtime

Properties

Name	Type	Description
id	string	A unique identifier for the chat completion, prefixed with 'chatcmpl-'
object	string	The object type, which is always 'chat.completion'
created	integer	The Unix timestamp (in seconds) of when the chat completion was created
model	string	The model used for the chat completion (e.g., 'gpt-4o-2024-08-06')
choices	array	A list of chat completion choices. Can be more than one if n is greater than 1.
usage	object	Usage statistics for the completion request
system_fingerprint	string	Fingerprint representing the backend configuration the model runs with. Can be used with the seed parameter to understand when backend changes have been made.
service_tier	string	The service tier used for processing the request

View JSON Schema on GitHub