{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://platform.openai.com/schemas/chat-completion.json",
  "title": "ChatGPT Chat Completion",
  "description": "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.",
  "type": "object",
  "required": ["id", "object", "created", "model", "choices"],
  "properties": {
    "id": {
      "type": "string",
      "description": "A unique identifier for the chat completion, prefixed with 'chatcmpl-'",
      "pattern": "^chatcmpl-"
    },
    "object": {
      "type": "string",
      "description": "The object type, which is always 'chat.completion'",
      "const": "chat.completion"
    },
    "created": {
      "type": "integer",
      "description": "The Unix timestamp (in seconds) of when the chat completion was created",
      "minimum": 0
    },
    "model": {
      "type": "string",
      "description": "The model used for the chat completion (e.g., 'gpt-4o-2024-08-06')",
      "minLength": 1
    },
    "choices": {
      "type": "array",
      "description": "A list of chat completion choices. Can be more than one if n is greater than 1.",
      "minItems": 1,
      "items": {
        "$ref": "#/$defs/Choice"
      }
    },
    "usage": {
      "$ref": "#/$defs/Usage",
      "description": "Usage statistics for the completion request"
    },
    "system_fingerprint": {
      "type": "string",
      "description": "Fingerprint representing the backend configuration the model runs with. Can be used with the seed parameter to understand when backend changes have been made.",
      "nullable": true
    },
    "service_tier": {
      "type": "string",
      "description": "The service tier used for processing the request",
      "nullable": true
    }
  },
  "$defs": {
    "Choice": {
      "type": "object",
      "description": "A single completion choice generated by the model",
      "required": ["index", "message", "finish_reason"],
      "properties": {
        "index": {
          "type": "integer",
          "description": "The index of the choice in the list of choices",
          "minimum": 0
        },
        "message": {
          "$ref": "#/$defs/AssistantMessage",
          "description": "A chat completion message generated by the model"
        },
        "finish_reason": {
          "type": "string",
          "description": "The reason the model stopped generating tokens",
          "enum": ["stop", "length", "tool_calls", "content_filter"],
          "nullable": true
        },
        "logprobs": {
          "$ref": "#/$defs/Logprobs",
          "description": "Log probability information for the choice",
          "nullable": true
        }
      }
    },
    "AssistantMessage": {
      "type": "object",
      "description": "A message generated by the model in response to the conversation",
      "required": ["role"],
      "properties": {
        "role": {
          "type": "string",
          "description": "The role of the author of this message",
          "const": "assistant"
        },
        "content": {
          "type": "string",
          "description": "The contents of the message",
          "nullable": true
        },
        "tool_calls": {
          "type": "array",
          "description": "The tool calls generated by the model, such as function calls",
          "items": {
            "$ref": "#/$defs/ToolCall"
          }
        },
        "refusal": {
          "type": "string",
          "description": "The refusal message generated by the model if it declines to respond",
          "nullable": true
        },
        "audio": {
          "$ref": "#/$defs/AudioOutput",
          "description": "Audio response from the model when audio output is requested",
          "nullable": true
        }
      }
    },
    "ToolCall": {
      "type": "object",
      "description": "A tool call generated by the model",
      "required": ["id", "type", "function"],
      "properties": {
        "id": {
          "type": "string",
          "description": "The ID of the tool call"
        },
        "type": {
          "type": "string",
          "description": "The type of the tool. Currently, only 'function' is supported.",
          "const": "function"
        },
        "function": {
          "$ref": "#/$defs/FunctionCall",
          "description": "The function that the model called"
        }
      }
    },
    "FunctionCall": {
      "type": "object",
      "description": "The function that the model called",
      "required": ["name", "arguments"],
      "properties": {
        "name": {
          "type": "string",
          "description": "The name of the function to call",
          "maxLength": 64
        },
        "arguments": {
          "type": "string",
          "description": "The arguments to call the function with, as generated by the model in JSON format"
        }
      }
    },
    "AudioOutput": {
      "type": "object",
      "description": "Audio output from the model",
      "properties": {
        "id": {
          "type": "string",
          "description": "Unique identifier for the audio response"
        },
        "data": {
          "type": "string",
          "description": "Base64-encoded audio data"
        },
        "expires_at": {
          "type": "integer",
          "description": "Unix timestamp for when the audio expires"
        },
        "transcript": {
          "type": "string",
          "description": "Transcript of the audio"
        }
      }
    },
    "Logprobs": {
      "type": "object",
      "description": "Log probability information for the completion",
      "properties": {
        "content": {
          "type": "array",
          "description": "A list of message content tokens with log probability information",
          "nullable": true,
          "items": {
            "$ref": "#/$defs/TokenLogprob"
          }
        },
        "refusal": {
          "type": "array",
          "description": "A list of refusal message tokens with log probability information",
          "nullable": true,
          "items": {
            "$ref": "#/$defs/TokenLogprob"
          }
        }
      }
    },
    "TokenLogprob": {
      "type": "object",
      "description": "Token with its associated log probability information",
      "required": ["token", "logprob", "bytes"],
      "properties": {
        "token": {
          "type": "string",
          "description": "The token string"
        },
        "logprob": {
          "type": "number",
          "description": "The log probability of this token"
        },
        "bytes": {
          "type": "array",
          "description": "A list of integers representing the UTF-8 bytes of the token",
          "nullable": true,
          "items": {
            "type": "integer"
          }
        },
        "top_logprobs": {
          "type": "array",
          "description": "List of the most likely tokens and their log probabilities at this position",
          "items": {
            "type": "object",
            "required": ["token", "logprob", "bytes"],
            "properties": {
              "token": {
                "type": "string"
              },
              "logprob": {
                "type": "number"
              },
              "bytes": {
                "type": "array",
                "nullable": true,
                "items": {
                  "type": "integer"
                }
              }
            }
          }
        }
      }
    },
    "Usage": {
      "type": "object",
      "description": "Token usage statistics for the completion request",
      "required": ["prompt_tokens", "completion_tokens", "total_tokens"],
      "properties": {
        "prompt_tokens": {
          "type": "integer",
          "description": "Number of tokens in the prompt",
          "minimum": 0
        },
        "completion_tokens": {
          "type": "integer",
          "description": "Number of tokens in the generated completion",
          "minimum": 0
        },
        "total_tokens": {
          "type": "integer",
          "description": "Total number of tokens used in the request (prompt + completion)",
          "minimum": 0
        },
        "completion_tokens_details": {
          "type": "object",
          "description": "Breakdown of completion token usage",
          "properties": {
            "reasoning_tokens": {
              "type": "integer",
              "description": "Tokens generated by the model for internal reasoning",
              "minimum": 0
            },
            "accepted_prediction_tokens": {
              "type": "integer",
              "description": "Tokens from a prediction that appeared in the completion",
              "minimum": 0
            },
            "rejected_prediction_tokens": {
              "type": "integer",
              "description": "Tokens from a prediction that did not appear in the completion",
              "minimum": 0
            }
          }
        },
        "prompt_tokens_details": {
          "type": "object",
          "description": "Breakdown of prompt token usage",
          "properties": {
            "cached_tokens": {
              "type": "integer",
              "description": "Number of cached prompt tokens",
              "minimum": 0
            },
            "audio_tokens": {
              "type": "integer",
              "description": "Number of audio tokens in the prompt",
              "minimum": 0
            }
          }
        }
      }
    },
    "Message": {
      "type": "object",
      "description": "A message in a chat conversation used as input to the model",
      "required": ["role"],
      "properties": {
        "role": {
          "type": "string",
          "description": "The role of the message author",
          "enum": ["system", "user", "assistant", "tool"]
        },
        "content": {
          "description": "The contents of the message, either a string or an array of content parts",
          "oneOf": [
            {
              "type": "string"
            },
            {
              "type": "array",
              "items": {
                "$ref": "#/$defs/ContentPart"
              }
            }
          ],
          "nullable": true
        },
        "name": {
          "type": "string",
          "description": "An optional name for the participant to differentiate between participants of the same role"
        },
        "tool_calls": {
          "type": "array",
          "description": "Tool calls generated by the model (assistant messages only)",
          "items": {
            "$ref": "#/$defs/ToolCall"
          }
        },
        "tool_call_id": {
          "type": "string",
          "description": "The ID of the tool call this message responds to (tool messages only)"
        },
        "refusal": {
          "type": "string",
          "description": "The refusal message generated by the model",
          "nullable": true
        }
      }
    },
    "ContentPart": {
      "type": "object",
      "description": "A content part within a multi-part message, supporting text and image inputs",
      "required": ["type"],
      "properties": {
        "type": {
          "type": "string",
          "description": "The type of content part",
          "enum": ["text", "image_url", "input_audio"]
        },
        "text": {
          "type": "string",
          "description": "The text content (when type is 'text')"
        },
        "image_url": {
          "type": "object",
          "description": "The image URL object (when type is 'image_url')",
          "properties": {
            "url": {
              "type": "string",
              "format": "uri",
              "description": "The URL of the image or base64-encoded image data"
            },
            "detail": {
              "type": "string",
              "description": "The detail level of the image",
              "enum": ["auto", "low", "high"],
              "default": "auto"
            }
          },
          "required": ["url"]
        },
        "input_audio": {
          "type": "object",
          "description": "The audio input object (when type is 'input_audio')",
          "properties": {
            "data": {
              "type": "string",
              "description": "Base64-encoded audio data"
            },
            "format": {
              "type": "string",
              "description": "The format of the encoded audio data",
              "enum": ["wav", "mp3"]
            }
          },
          "required": ["data", "format"]
        }
      }
    },
    "Tool": {
      "type": "object",
      "description": "A tool available for the model to call",
      "required": ["type", "function"],
      "properties": {
        "type": {
          "type": "string",
          "description": "The type of the tool",
          "const": "function"
        },
        "function": {
          "$ref": "#/$defs/FunctionDefinition",
          "description": "The function definition"
        }
      }
    },
    "FunctionDefinition": {
      "type": "object",
      "description": "Definition of a function that the model may call",
      "required": ["name"],
      "properties": {
        "name": {
          "type": "string",
          "description": "The name of the function",
          "maxLength": 64,
          "pattern": "^[a-zA-Z0-9_-]+$"
        },
        "description": {
          "type": "string",
          "description": "A description of what the function does"
        },
        "parameters": {
          "type": "object",
          "description": "The parameters the function accepts, described as a JSON Schema object"
        },
        "strict": {
          "type": "boolean",
          "description": "Whether to enable strict schema adherence when generating the function call",
          "default": false
        }
      }
    }
  }
}