NVIDIA NIM Chat Completion

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/nvidia-nim/refs/heads/main/json-schema/nvidia-nim-chat-completion-schema.json",
  "title": "NVIDIA NIM Chat Completion",
  "description": "Request and response schemas for the NVIDIA NIM OpenAI-compatible /v1/chat/completions endpoint.",
  "type": "object",
  "$defs": {
    "ChatMessage": {
      "type": "object",
      "required": ["role"],
      "properties": {
        "role": {
          "type": "string",
          "enum": ["system", "user", "assistant", "tool"]
        },
        "content": {
          "oneOf": [
            { "type": "string" },
            {
              "type": "array",
              "items": { "$ref": "#/$defs/ContentPart" }
            }
          ]
        },
        "name": { "type": "string" },
        "tool_call_id": { "type": "string" },
        "tool_calls": {
          "type": "array",
          "items": { "$ref": "#/$defs/ToolCall" }
        }
      }
    },
    "ContentPart": {
      "type": "object",
      "required": ["type"],
      "properties": {
        "type": { "type": "string", "enum": ["text", "image_url"] },
        "text": { "type": "string" },
        "image_url": {
          "type": "object",
          "properties": {
            "url": { "type": "string" }
          }
        }
      }
    },
    "ToolCall": {
      "type": "object",
      "properties": {
        "id": { "type": "string" },
        "type": { "type": "string", "enum": ["function"] },
        "function": {
          "type": "object",
          "properties": {
            "name": { "type": "string" },
            "arguments": { "type": "string" }
          }
        }
      }
    },
    "ChatCompletionRequest": {
      "type": "object",
      "required": ["model", "messages"],
      "properties": {
        "model": { "type": "string" },
        "messages": {
          "type": "array",
          "items": { "$ref": "#/$defs/ChatMessage" }
        },
        "temperature": { "type": "number", "minimum": 0, "maximum": 2 },
        "top_p": { "type": "number", "minimum": 0, "maximum": 1 },
        "max_tokens": { "type": "integer", "minimum": 1 },
        "stream": { "type": "boolean" },
        "stop": {
          "oneOf": [
            { "type": "string" },
            { "type": "array", "items": { "type": "string" } }
          ]
        },
        "n": { "type": "integer", "minimum": 1 },
        "seed": { "type": "integer" },
        "tools": {
          "type": "array",
          "items": { "type": "object" }
        },
        "tool_choice": {
          "oneOf": [
            { "type": "string", "enum": ["auto", "none", "required"] },
            { "type": "object" }
          ]
        },
        "response_format": {
          "type": "object",
          "properties": {
            "type": { "type": "string", "enum": ["text", "json_object", "json_schema"] }
          }
        },
        "frequency_penalty": { "type": "number" },
        "presence_penalty": { "type": "number" }
      }
    },
    "ChatCompletionResponse": {
      "type": "object",
      "properties": {
        "id": { "type": "string" },
        "object": { "type": "string", "const": "chat.completion" },
        "created": { "type": "integer" },
        "model": { "type": "string" },
        "choices": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "index": { "type": "integer" },
              "message": { "$ref": "#/$defs/ChatMessage" },
              "finish_reason": {
                "type": "string",
                "enum": ["stop", "length", "tool_calls", "content_filter"]
              }
            }
          }
        },
        "usage": {
          "type": "object",
          "properties": {
            "prompt_tokens": { "type": "integer" },
            "completion_tokens": { "type": "integer" },
            "total_tokens": { "type": "integer" }
          }
        }
      }
    }
  },
  "oneOf": [
    { "$ref": "#/$defs/ChatCompletionRequest" },
    { "$ref": "#/$defs/ChatCompletionResponse" }
  ]
}