Anthropic (Native Mode) | Enterprise Router

Setup

Install the Anthropic SDK:

pip install anthropic

Configure the client:

import anthropic
client = anthropic.Anthropic(
    api_key="sk-proxy-YOUR_KEY_HERE",
    base_url="https://api.enterpriserouter.com/anthropic"
)

Basic message

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Explain quantum computing in one paragraph."}
    ]
)
print(message.content[0].text)

Streaming

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

Tool use

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    tools=[
        {
            "name": "get_weather",
            "description": "Get the current weather for a location",
            "input_schema": {
                "type": "object",
                "properties": {
                    "location": {"type": "string", "description": "City name"}
                },
                "required": ["location"]
            }
        }
    ],
    messages=[{"role": "user", "content": "What's the weather in Tokyo?"}]
)
for block in message.content:
    if block.type == "tool_use":
        print(f"Tool: {block.name}, Input: {block.input}")

System prompts

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    system="You are a senior software engineer. Be concise and precise.",
    messages=[{"role": "user", "content": "Review this function: def add(a, b): return a + b"}]
)

TypeScript

import Anthropic from "@anthropic-ai/sdk";
const client = new Anthropic({
  apiKey: "sk-proxy-YOUR_KEY_HERE",
  baseURL: "https://api.enterpriserouter.com/anthropic",
});
const message = await client.messages.create({
  model: "claude-sonnet-4-6",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(message.content[0].text);

Notes

anthropic-version header: The gateway automatically sets anthropic-version: 2023-06-01 if your request doesn’t include one.
All Anthropic features are supported: vision, tool use, extended thinking, batches — the request is proxied unmodified.

Supported models

claude-opus-4-6, claude-sonnet-4-6
claude-opus-4-5, claude-haiku-4-5

New Anthropic models work automatically.