OpenAI 官方库使用

在 OpenAI 官方库使用

老张API 完全兼容 OpenAI API 格式，您可以直接使用官方 OpenAI SDK，价格简单修改配置即可无缝切换到老张API 服务。

默认 base_url 使用 https://api2.laozhang.ai/v1。欧美服务器可使用海外直连 https://api-vip.laozhang.ai/v1；Cloudflare 全球备用线路为 https://api-cf.laozhang.ai/v1，长耗时同步请求需注意约 120 秒代理读取超时。查看 API 域名选择与切换说明。

支持的官方 SDK

老张API 支持所有官方 OpenAI SDK：

Python (openai)
Node.js (openai)
.NET (OpenAI)
Go (go-openai)
Java (第三方)
PHP (第三方)
Ruby (第三方)

Python SDK

安装

pip install openai

基础配置

from openai import OpenAI

# 配置 老张API 服务
client = OpenAI(
    api_key="YOUR_API_KEY",  # 您的 老张API 密钥
    base_url="https://api2.laozhang.ai/v1"  # 老张API 端点
)

# 使用方式与官方完全相同
response = client.chat.completions.create(
    model="gpt-3.5-turbo",
    messages=[
        {"role": "user", "content": "Hello!"}
    ]
)

print(response.choices[0].message.content)

环境变量配置

import os
from openai import OpenAI

# 设置环境变量
os.environ["OPENAI_API_KEY"] = "YOUR_API_KEY"
os.environ["OPENAI_BASE_URL"] = "https://api2.laozhang.ai/v1"

# 使用默认配置
client = OpenAI()

response = client.chat.completions.create(
    model="gpt-4",
    messages=[{"role": "user", "content": "Explain quantum computing"}]
)

异步使用

import asyncio
from openai import AsyncOpenAI

async def main():
    client = AsyncOpenAI(
        api_key="YOUR_API_KEY",
        base_url="https://api2.laozhang.ai/v1"
    )
    
    response = await client.chat.completions.create(
        model="gpt-3.5-turbo",
        messages=[{"role": "user", "content": "Hello!"}]
    )
    
    print(response.choices[0].message.content)

asyncio.run(main())

流式输出

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://api2.laozhang.ai/v1"
)

stream = client.chat.completions.create(
    model="gpt-3.5-turbo",
    messages=[{"role": "user", "content": "Write a short story"}],
    stream=True
)

for chunk in stream:
    if chunk.choices[0].delta.content is not None:
        print(chunk.choices[0].delta.content, end="")

Node.js SDK

安装

npm install openai

基础配置

import OpenAI from 'openai';

const openai = new OpenAI({
  apiKey: 'YOUR_API_KEY',
  baseURL: 'https://api2.laozhang.ai/v1'
});

const response = await openai.chat.completions.create({
  model: 'gpt-3.5-turbo',
  messages: [{ role: 'user', content: 'Hello!' }]
});

console.log(response.choices[0].message.content);

环境变量配置

// 设置环境变量
process.env.OPENAI_API_KEY = 'YOUR_API_KEY';
process.env.OPENAI_BASE_URL = 'https://api2.laozhang.ai/v1';

import OpenAI from 'openai';

// 使用默认配置
const openai = new OpenAI();

const response = await openai.chat.completions.create({
  model: 'gpt-4',
  messages: [{ role: 'user', content: 'Explain AI to a 5-year-old' }]
});

流式输出

const stream = await openai.chat.completions.create({
  model: 'gpt-3.5-turbo',
  messages: [{ role: 'user', content: 'Tell me a joke' }],
  stream: true
});

for await (const chunk of stream) {
  if (chunk.choices[0]?.delta?.content) {
    process.stdout.write(chunk.choices[0].delta.content);
  }
}

TypeScript 支持

import OpenAI from 'openai';
import type { ChatCompletionCreateParamsNonStreaming } from 'openai/resources/chat/completions';

const openai = new OpenAI({
  apiKey: process.env.OPENAI_API_KEY!,
  baseURL: 'https://api2.laozhang.ai/v1'
});

const params: ChatCompletionCreateParamsNonStreaming = {
  model: 'gpt-3.5-turbo',
  messages: [{ role: 'user', content: 'Hello TypeScript!' }],
  temperature: 0.7
};

const response = await openai.chat.completions.create(params);

.NET SDK

安装

dotnet add package OpenAI

基础配置

using OpenAI;
using OpenAI.Chat;

var client = new OpenAIClient("YOUR_API_KEY", new OpenAIClientOptions
{
    Endpoint = new Uri("https://api2.laozhang.ai/v1")
});

var chatClient = client.GetChatClient("gpt-3.5-turbo");

var response = await chatClient.CompleteChatAsync("Hello!");

Console.WriteLine(response.Value.Content[0].Text);

流式输出

await foreach (var update in chatClient.CompleteChatStreamingAsync("Tell me a story"))
{
    if (update.ContentUpdate.Count > 0)
    {
        Console.Write(update.ContentUpdate[0].Text);
    }
}

Go SDK

安装

go get github.com/sashabaranov/go-openai

基础配置

package main

import (
    "context"
    "fmt"
    "github.com/sashabaranov/go-openai"
)

func main() {
    config := openai.DefaultConfig("YOUR_API_KEY")
    config.BaseURL = "https://api2.laozhang.ai/v1"
    
    client := openai.NewClientWithConfig(config)
    
    resp, err := client.CreateChatCompletion(
        context.Background(),
        openai.ChatCompletionRequest{
            Model: openai.GPT3Dot5Turbo,
            Messages: []openai.ChatCompletionMessage{
                {
                    Role:    openai.ChatMessageRoleUser,
                    Content: "Hello!",
                },
            },
        },
    )
    
    if err != nil {
        fmt.Printf("Error: %v\n", err)
        return
    }
    
    fmt.Println(resp.Choices[0].Message.Content)
}

流式输出

stream, err := client.CreateChatCompletionStream(
    context.Background(),
    openai.ChatCompletionRequest{
        Model: openai.GPT3Dot5Turbo,
        Messages: []openai.ChatCompletionMessage{
            {
                Role:    openai.ChatMessageRoleUser,
                Content: "Write a haiku",
            },
        },
        Stream: true,
    },
)

if err != nil {
    fmt.Printf("Error: %v\n", err)
    return
}
defer stream.Close()

for {
    response, err := stream.Recv()
    if errors.Is(err, io.EOF) {
        break
    }
    
    if err != nil {
        fmt.Printf("Error: %v\n", err)
        return
    }
    
    fmt.Print(response.Choices[0].Delta.Content)
}

Java SDK

依赖配置

<dependency>
    <groupId>com.theokanning.openai-gpt3-java</groupId>
    <artifactId>service</artifactId>
    <version>0.18.2</version>
</dependency>

基础使用

import com.theokanning.openai.OpenAiService;
import com.theokanning.openai.completion.chat.*;

import java.time.Duration;
import java.util.List;

public class LaoZhangExample {
    public static void main(String[] args) {
        OpenAiService service = new OpenAiService(
            "YOUR_API_KEY", 
            Duration.ofSeconds(60),
            "https://api2.laozhang.ai/v1/"
        );
        
        ChatCompletionRequest request = ChatCompletionRequest.builder()
            .model("gpt-3.5-turbo")
            .messages(List.of(
                new ChatMessage(ChatMessageRole.USER, "Hello!")
            ))
            .build();
        
        ChatCompletionResult result = service.createChatCompletion(request);
        System.out.println(result.getChoices().get(0).getMessage().getContent());
    }
}

模型切换

使用不同模型

# GPT 模型
response = client.chat.completions.create(
    model="gpt-4",
    messages=[{"role": "user", "content": "Hello"}]
)

# Claude 模型
response = client.chat.completions.create(
    model="claude-sonnet-4-20250514",
    messages=[{"role": "user", "content": "Hello"}]
)

# Gemini 模型
response = client.chat.completions.create(
    model="gemini-2.5-pro",
    messages=[{"role": "user", "content": "Hello"}]
)

动态模型选择

def chat_with_model(message: str, model: str = "gpt-3.5-turbo"):
    """支持动态切换模型的聊天函数"""
    response = client.chat.completions.create(
        model=model,
        messages=[{"role": "user", "content": message}]
    )
    return response.choices[0].message.content

# 使用不同模型
print(chat_with_model("解释量子计算", "gpt-4"))
print(chat_with_model("解释量子计算", "claude-sonnet-4-20250514"))
print(chat_with_model("解释量子计算", "gemini-2.5-pro"))

高级功能

Function Calling

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

response = client.chat.completions.create(
    model="gpt-3.5-turbo",
    messages=[{"role": "user", "content": "北京天气怎么样？"}],
    tools=tools,
    tool_choice="auto"
)

if response.choices[0].message.tool_calls:
    print("AI 想要调用函数：", response.choices[0].message.tool_calls[0].function.name)

图像输入

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[
        {
            "role": "user",
            "content": [
                {"type": "text", "text": "这张图片里有什么？"},
                {
                    "type": "image_url",
                    "image_url": {
                        "url": "https://example.com/image.jpg"
                    }
                }
            ]
        }
    ]
)

嵌入向量

response = client.embeddings.create(
    model="text-embedding-3-small",
    input="要嵌入的文本内容"
)

embedding = response.data[0].embedding
print(f"向量维度：{len(embedding)}")

错误处理

基础错误处理

from openai import OpenAI, OpenAIError

try:
    response = client.chat.completions.create(
        model="gpt-3.5-turbo",
        messages=[{"role": "user", "content": "Hello"}]
    )
except OpenAIError as e:
    print(f"API 错误：{e}")

详细错误处理

from openai import (
    OpenAI, 
    APIError, 
    APIConnectionError, 
    RateLimitError,
    InternalServerError
)

try:
    response = client.chat.completions.create(
        model="gpt-3.5-turbo",
        messages=[{"role": "user", "content": "Hello"}]
    )
except RateLimitError:
    print("请求频率超限，请稍后重试")
except APIConnectionError:
    print("网络连接错误")
except InternalServerError:
    print("服务器内部错误")
except APIError as e:
    print(f"API 错误：{e}")

最佳实践

1. 配置管理

import os
from openai import OpenAI

class LaoZhangClient:
    def __init__(self):
        self.client = OpenAI(
            api_key=os.getenv("LaoZhang_API_KEY"),
            base_url=os.getenv("LaoZhang_BASE_URL", "https://api2.laozhang.ai/v1")
        )
    
    def chat(self, message: str, model: str = "gpt-3.5-turbo"):
        return self.client.chat.completions.create(
            model=model,
            messages=[{"role": "user", "content": message}]
        )

2. 重试机制

import time
import random
from openai import OpenAI, RateLimitError

def chat_with_retry(client, messages, max_retries=3):
    for attempt in range(max_retries):
        try:
            return client.chat.completions.create(
                model="gpt-3.5-turbo",
                messages=messages
            )
        except RateLimitError:
            if attempt < max_retries - 1:
                wait_time = (2 ** attempt) + random.uniform(0, 1)
                time.sleep(wait_time)
            else:
                raise

3. 成本控制

def controlled_chat(message: str, max_tokens: int = 150):
    """控制输出长度以管理成本"""
    response = client.chat.completions.create(
        model="gpt-3.5-turbo",
        messages=[{"role": "user", "content": message}],
        max_tokens=max_tokens,
        temperature=0.7
    )
    return response

迁移指南

从 OpenAI 迁移

如果您已经在使用 OpenAI 官方服务，迁移到老张API 非常简单：

更改 base_url

# 原来的配置
client = OpenAI(api_key="sk-...")

# 改为 老张API
client = OpenAI(
    api_key="YOUR_LaoZhang_KEY", 
    base_url="https://api2.laozhang.ai/v1"
)

更新环境变量

# 原来
export OPENAI_API_KEY="sk-..."

# 改为
export OPENAI_API_KEY="YOUR_LaoZhang_KEY"
export OPENAI_BASE_URL="https://api2.laozhang.ai/v1"

代码无需修改 所有其他代码保持不变，包括：

方法调用
参数格式
响应处理

多服务兼容

class MultiProviderClient:
    def __init__(self):
        self.laozhang_client = OpenAI(
            api_key="LaoZhang_KEY",
            base_url="https://api2.laozhang.ai/v1"
        )
        self.openai_client = OpenAI(api_key="OPENAI_KEY")
    
    def chat(self, message: str, provider: str = "laozhang"):
        client = self.laozhang_client if provider == "laozhang" else self.openai_client
        return client.chat.completions.create(
            model="gpt-3.5-turbo",
            messages=[{"role": "user", "content": message}]
        )

需要更多帮助？请访问老张API官网或查看官方 SDK 文档。

​在 OpenAI 官方库使用

​支持的官方 SDK

​Python SDK

​安装

​基础配置

​环境变量配置

​异步使用

​流式输出

​Node.js SDK

​安装

​基础配置

​环境变量配置

​流式输出

​TypeScript 支持

​.NET SDK

​安装

​基础配置

​流式输出

​Go SDK

​安装

​基础配置

​流式输出

​Java SDK

​依赖配置

​基础使用

​模型切换

​使用不同模型

​动态模型选择

​高级功能

​Function Calling

​图像输入

​嵌入向量

​错误处理

​基础错误处理

​详细错误处理

​最佳实践

​1. 配置管理

​2. 重试机制

​3. 成本控制

​迁移指南

​从 OpenAI 迁移

​多服务兼容

在 OpenAI 官方库使用

支持的官方 SDK

Python SDK

安装

基础配置

环境变量配置

异步使用

流式输出

Node.js SDK

安装

基础配置

环境变量配置

流式输出

TypeScript 支持

.NET SDK

安装

基础配置

流式输出

Go SDK

安装

基础配置

流式输出

Java SDK

依赖配置

基础使用

模型切换

使用不同模型

动态模型选择

高级功能

Function Calling

图像输入

嵌入向量

错误处理

基础错误处理

详细错误处理

最佳实践

1. 配置管理

2. 重试机制

3. 成本控制

迁移指南

从 OpenAI 迁移

多服务兼容