# 首次调用 API
DeepSeek API 使用与 OpenAI/Anthropic 兼容的 API 格式，通过修改配置，您可以使用 OpenAI/Anthropic SDK 来访问 DeepSeek API，或使用与 OpenAI/Anthropic API 兼容的软件。

| PARAM	| VALUE |
|-------|--------|
|base_url (OpenAI)	| https://api.deepseek.com |
|base_url (Anthropic)	| https://api.deepseek.com/anthropic |
|api_key	| apply for an [API key](https://platform.deepseek.com/api_keys) |
|model*	| deepseek-v4-flash<br>deepseek-v4-pro<br> deepseek-chat (将于 2026/07/24 弃用)<br> deepseek-reasoner (将于 2026/07/24 弃用) |
* deepseek-chat 与 deepseek-reasoner 两个模型名将于北京时间 2026/07/24 23:59 弃用。出于兼容考虑，二者分别对应 deepseek-v4-flash 的非思考与思考模式。

详见 [Agent 工具接入指南](https://api-docs.deepseek.com/zh-cn/quick_start/agent_integrations/claude_code)。

## 接入 Agent 工具
DeepSeek API 已接入多种主流 AI Agent 与编程助手工具。如果你使用 Claude Code、GitHub Copilot、OpenCode 等工具，可以直接将 DeepSeek 作为后端模型，无需编写代码即可开始使用。


## 调用对话 API
在创建 API key 之后，你可以使用以下样例脚本，通过 OpenAI API 格式来访问 DeepSeek 模型。样例为非流式输出，您可以将 stream 设置为 true 来使用流式输出。

Anthropic API 格式的访问样例，请参考[Anthropic API](https://api-docs.deepseek.com/zh-cn/guides/anthropic_api)。

### curl
```json
curl https://api.deepseek.com/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer ${DEEPSEEK_API_KEY}" \
  -d '{
        "model": "deepseek-v4-pro",
        "messages": [
          {"role": "system", "content": "You are a helpful assistant."},
          {"role": "user", "content": "Hello!"}
        ],
        "thinking": {"type": "enabled"},
        "reasoning_effort": "high",
        "stream": false
      }'
```

### python
```python
# Please install OpenAI SDK first: `pip3 install openai`
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ.get('DEEPSEEK_API_KEY'),
    base_url="https://api.deepseek.com")

response = client.chat.completions.create(
    model="deepseek-v4-pro",
    messages=[
        {"role": "system", "content": "You are a helpful assistant"},
        {"role": "user", "content": "Hello"},
    ],
    stream=False,
    reasoning_effort="high",
    extra_body={"thinking": {"type": "enabled"}}
)

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

### nodejs
```javascript
// Please install OpenAI SDK first: `npm install openai`

import OpenAI from "openai";

const openai = new OpenAI({
        baseURL: 'https://api.deepseek.com',
        apiKey: process.env.DEEPSEEK_API_KEY,
});

async function main() {
  const completion = await openai.chat.completions.create({
    messages: [{ role: "system", content: "You are a helpful assistant." }],
    model: "deepseek-v4-pro",
    thinking: {"type": "enabled"},
    reasoning_effort: "high",
    stream: false,
  });

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

main();
```