Anthropic SDK

PulseNeko2026/5/20大约 1 分钟

走 Anthropic 原生 /v1/messages 协议，对 Claude 系列模型功能最完整（含 prompt cache、工具调用、文档块）。

Python

import anthropic

client = anthropic.Anthropic(
    base_url="https://bridge.pulseneko.com",
    api_key="sk-你的-Key",
)

msg = client.messages.create(
    model="claude-opus-4-7",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
)
print(msg.content[0].text)

Base URL 不要带 /v1

Anthropic SDK 内部会自己拼 /v1/messages。你只填到 https://bridge.pulseneko.com 即可，多加 /v1 会变成 /v1/v1/messages 报 404。

鉴权方式

Anthropic SDK 默认从 ANTHROPIC_API_KEY 读 Key，会自动放进 x-api-key header。Bridge 同时识别 x-api-key 和 Authorization: Bearer，两种都可以。

流式

with client.messages.stream(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "..."}],
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

Prompt Cache

msg = client.messages.create(
    model="claude-opus-4-7",
    max_tokens=1024,
    system=[
        {
            "type": "text",
            "text": "<长系统提示>",
            "cache_control": {"type": "ephemeral"},
        }
    ],
    messages=[{"role": "user", "content": "..."}],
)

Cache 命中的部分按模型广场上的「缓存」列计费，通常远低于「输入」列。

工具调用

msg = client.messages.create(
    model="claude-opus-4-7",
    max_tokens=1024,
    tools=[{
        "name": "get_weather",
        "description": "查询天气",
        "input_schema": {
            "type": "object",
            "properties": {"city": {"type": "string"}},
            "required": ["city"],
        },
    }],
    messages=[{"role": "user", "content": "上海今天天气怎么样？"}],
)

Node.js

import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  baseURL: "https://bridge.pulseneko.com",
  apiKey: process.env.PULSENEKO_KEY,
});

const msg = await client.messages.create({
  model: "claude-opus-4-7",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello" }],
});

console.log(msg.content[0].text);

模型	适合
`claude-haiku-4-5`	高并发、低延迟、便宜
`claude-sonnet-4-6`	日常主力
`claude-opus-4-7`	高质量推理、长上下文
`claude-opus-4-7-thinking`	4.7 + 扩展思考