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OpenAI 重磅更新，支持自定义函数调用！

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程序员树先生

发布于 2023-06-14 11:41:24

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代码可运行

OpenAI 终于发力了，今天凌晨更新了一大波内容，让我们一起来看看：

Chat Completions API 中现在支持函数调用了，也就是说为 API 接口定义了一套标准的插件规范！
新增了 gpt-4-0613 和 gpt-3.5-turbo-0613 模型
新增了支持 16k 上下文的 gpt-3.5-turbo-16k 模型
嵌入模型成本降低 75%
gpt-3.5-turbo 模型 tokens 成本降低 25%
gpt-3.5-turbo-0301 和 gpt-4-0314 模型即将被废弃

函数调用

OpenAI API 现在支持函数调用了，但仅限于 gpt-4-0613 和 gpt-3.5-turbo-0613 模型，其实就是支持插件了！应用场景：

创建聊天机器人，通过调用外部工具（例如 ChatGPT 插件）来回答问题
将自然语言转换为 API 调用或数据库查询
从文本中提取结构化数据

函数调用举例

1、使用函数和用户的输入调用模型

请求：

curl https://api.openai.com/v1/chat/completions -u :$OPENAI_API_KEY -H 'Content-Type: application/json' -d '{
  "model": "gpt-3.5-turbo-0613",
  "messages": [
    {"role": "user", "content": "What is the weather like in Boston?"}
  ],
  "functions": [
    {
      "name": "get_current_weather",
      "description": "Get the current weather in a given location",
      "parameters": {
        "type": "object",
        "properties": {
          "location": {
            "type": "string",
            "description": "The city and state, e.g. San Francisco, CA"
          },
          "unit": {
            "type": "string",
            "enum": ["celsius", "fahrenheit"]
          }
        },
        "required": ["location"]
      }
    }
  ]
}'

响应：

{
  "id": "chatcmpl-123",
  ...
  "choices": [{
    "index": 0,
    "message": {
      "role": "assistant",
      "content": null,
      "function_call": {
        "name": "get_current_weather",
        "arguments": "{ \"location\": \"Boston, MA\"}"
      }
    },
    "finish_reason": "function_call"
  }]
}

2、调用第三方 API

请求：

curl https://weatherapi.com/...

响应：

{ "temperature": 22, "unit": "celsius", "description": "Sunny" }

3、将响应发送回模型进行汇总

请求：

curl https://api.openai.com/v1/chat/completions -u :$OPENAI_API_KEY -H 'Content-Type: application/json' -d '{
  "model": "gpt-3.5-turbo-0613",
  "messages": [
    {"role": "user", "content": "What is the weather like in Boston?"},
    {"role": "assistant", "content": null, "function_call": {"name": "get_current_weather", "arguments": "{ \"location\": \"Boston, MA\"}"}},
    {"role": "function", "name": "get_current_weather", "content": "{\"temperature\": "22", \"unit\": \"celsius\", \"description\": \"Sunny\"}"}
  ],
  "functions": [
    {
      "name": "get_current_weather",
      "description": "Get the current weather in a given location",
      "parameters": {
        "type": "object",
        "properties": {
          "location": {
            "type": "string",
            "description": "The city and state, e.g. San Francisco, CA"
          },
          "unit": {
            "type": "string",
            "enum": ["celsius", "fahrenheit"]
          }
        },
        "required": ["location"]
      }
    }
  ]
}'

响应：

{
  "id": "chatcmpl-123",
  ...
  "choices": [{
    "index": 0,
    "message": {
      "role": "assistant",
      "content": "The weather in Boston is currently sunny with a temperature of 22 degrees Celsius.",
    },
    "finish_reason": "stop"
  }]
}