Function Calling

Chat Completions API（流式）

Python

from openai import OpenAI
import json

client = OpenAI(api_key="your-api-key", base_url="https://www.cheapertoken.work/v1")

tools = [
    {
        "type": "function",
        "function": {
            "name": "get_weather",
            "description": "获取指定城市的天气",
            "parameters": {
                "type": "object",
                "properties": {
                    "city": {"type": "string", "description": "城市名称"}
                },
                "required": ["city"]
            }
        }
    }
]

stream = client.chat.completions.create(
    model="gpt-5.4",
    messages=[{"role": "user", "content": "北京今天天气怎么样？"}],
    tools=tools,
    tool_choice="auto",
    stream=True,
)

tool_call_args = ""
tool_call_name = ""
for chunk in stream:
    delta = chunk.choices[0].delta
    if delta.tool_calls:
        for tc in delta.tool_calls:
            if tc.function.name:
                tool_call_name = tc.function.name
            if tc.function.arguments:
                tool_call_args += tc.function.arguments
    if chunk.choices[0].finish_reason == "tool_calls":
        args = json.loads(tool_call_args)
        print(f"调用函数: {tool_call_name}, 参数: {args}")

JavaScript

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: "your-api-key",
  baseURL: "https://www.cheapertoken.work/v1",
});

const tools = [
  {
    type: "function",
    function: {
      name: "get_weather",
      description: "获取指定城市的天气",
      parameters: {
        type: "object",
        properties: {
          city: { type: "string", description: "城市名称" },
        },
        required: ["city"],
      },
    },
  },
];

const stream = await client.chat.completions.create({
  model: "gpt-5.4",
  messages: [{ role: "user", content: "北京今天天气怎么样？" }],
  tools,
  tool_choice: "auto",
  stream: true,
});

let toolCallName = "";
let toolCallArgs = "";
for await (const chunk of stream) {
  const delta = chunk.choices[0]?.delta;
  if (delta?.tool_calls) {
    for (const tc of delta.tool_calls) {
      if (tc.function?.name) toolCallName = tc.function.name;
      if (tc.function?.arguments) toolCallArgs += tc.function.arguments;
    }
  }
  if (chunk.choices[0]?.finish_reason === "tool_calls") {
    const args = JSON.parse(toolCallArgs);
    console.log(`调用函数: ${toolCallName}, 参数:`, args);
  }
}

curl

curl https://www.cheapertoken.work/v1/chat/completions \
  -H "Authorization: Bearer your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.4",
    "messages": [{"role": "user", "content": "北京今天天气怎么样？"}],
    "tools": [
      {
        "type": "function",
        "function": {
          "name": "get_weather",
          "description": "获取指定城市的天气",
          "parameters": {
            "type": "object",
            "properties": {
              "city": {"type": "string", "description": "城市名称"}
            },
            "required": ["city"]
          }
        }
      }
    ],
    "tool_choice": "auto",
    "stream": true
  }'

Responses API

Python

from openai import OpenAI

client = OpenAI(api_key="your-api-key", base_url="https://www.cheapertoken.work/v1")

tools = [
    {
        "type": "function",
        "name": "get_weather",
        "description": "获取指定城市的天气",
        "parameters": {
            "type": "object",
            "properties": {
                "city": {"type": "string"}
            },
            "required": ["city"]
        }
    }
]

response = client.responses.create(
    model="gpt-5.4",
    input="上海今天天气怎么样？",
    tools=tools,
)

for output in response.output:
    if output.type == "function_call":
        print(f"调用函数: {output.name}, 参数: {output.arguments}")

JavaScript

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: "your-api-key",
  baseURL: "https://www.cheapertoken.work/v1",
});

const tools = [
  {
    type: "function",
    name: "get_weather",
    description: "获取指定城市的天气",
    parameters: {
      type: "object",
      properties: { city: { type: "string" } },
      required: ["city"],
    },
  },
];

const response = await client.responses.create({
  model: "gpt-5.4",
  input: "上海今天天气怎么样？",
  tools,
});

for (const output of response.output) {
  if (output.type === "function_call") {
    console.log(`调用函数: ${output.name}, 参数: ${output.arguments}`);
  }
}

curl

curl https://www.cheapertoken.work/v1/responses \
  -H "Authorization: Bearer your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.4",
    "input": "上海今天天气怎么样？",
    "tools": [
      {
        "type": "function",
        "name": "get_weather",
        "description": "获取指定城市的天气",
        "parameters": {
          "type": "object",
          "properties": {"city": {"type": "string"}},
          "required": ["city"]
        }
      }
    ]
  }'