# OpenAI Python SDK

> 两行改动把 OpenAI Python SDK 指向 TokRouter:base_url 与 api_key。

```bash
pip install openai
```

```python
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["TOKROUTER_API_KEY"],
    base_url="https://api.tokrouter.dev/v1",
)

# 非流式
resp = client.chat.completions.create(
    model="gpt-5.4-mini",
    messages=[{"role": "user", "content": "用一句话解释什么是 SSO"}],
)
print(resp.choices[0].message.content)

# 流式
for chunk in client.chat.completions.create(
    model="gpt-5.4-mini",
    messages=[{"role": "user", "content": "写一首四行诗"}],
    stream=True,
):
    delta = chunk.choices[0].delta.content
    if delta:
        print(delta, end="", flush=True)
```

## 用 OpenAI SDK 调 Claude

```python
resp = client.chat.completions.create(
    model="claude-opus-5-5",
    messages=[{"role": "user", "content": "你好"}],
)
```

## 工具调用

```python
tools = [{
    "type": "function",
    "function": {
        "name": "get_weather",
        "description": "查询城市天气",
        "parameters": {
            "type": "object",
            "properties": {"city": {"type": "string"}},
            "required": ["city"],
        },
    },
}]

resp = client.chat.completions.create(
    model="gpt-5.4",
    messages=[{"role": "user", "content": "北京天气怎么样?"}],
    tools=tools,
)
print(resp.choices[0].message.tool_calls)
```

字段级说明见 [API 参考 · Chat Completions](/zh/api-reference/chat-completions/)。