{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/osmapi/refs/heads/main/json-schema/osmapi-chat-completion-schema.json",
  "title": "osmAPI Chat Completion Response",
  "description": "Schema for an osmAPI chat completion response object",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique identifier for the completion"
    },
    "object": {
      "type": "string",
      "description": "Object type identifier"
    },
    "created": {
      "type": "integer",
      "description": "Unix timestamp of creation"
    },
    "model": {
      "type": "string",
      "description": "Model used for the completion"
    },
    "choices": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "index": {
            "type": "integer"
          },
          "message": {
            "type": "object",
            "properties": {
              "role": {
                "type": "string"
              },
              "content": {
                "type": "string"
              },
              "reasoning": {
                "type": "string"
              },
              "tool_calls": {
                "type": "array",
                "items": {
                  "type": "object"
                }
              },
              "images": {
                "type": "array",
                "items": {
                  "type": "string"
                }
              }
            }
          },
          "finish_reason": {
            "type": "string"
          }
        }
      }
    },
    "usage": {
      "type": "object",
      "properties": {
        "prompt_tokens": {
          "type": "integer"
        },
        "completion_tokens": {
          "type": "integer"
        },
        "total_tokens": {
          "type": "integer"
        },
        "reasoning_tokens": {
          "type": "integer"
        },
        "cost_usd_total": {
          "type": "number"
        },
        "cost_usd_input": {
          "type": "number"
        },
        "cost_usd_output": {
          "type": "number"
        }
      }
    },
    "metadata": {
      "type": "object",
      "properties": {
        "requested_model": {
          "type": "string"
        },
        "used_model": {
          "type": "string"
        },
        "used_provider": {
          "type": "string"
        }
      }
    }
  }
}