Connect with the Anthropic SDK

Keep the official Anthropic SDK and point the Base URL and API key to LLMRouter to call the Messages-compatible endpoint.

Configure the endpoint and key

export ANTHROPIC_BASE_URL=https://api.llmrouter.pro/anthropic
export ANTHROPIC_API_KEY=sk-lr-your-key

Choose your development language

Official SDK examples for JavaScript, Python, Go, Java, C#, Ruby and PHP.

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

const client = new Anthropic();

const message = await client.messages.create({
  model: "your-model",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello" }],
});

const firstBlock = message.content[0];
if (firstBlock?.type === "text") {
  console.log(firstBlock.text);
}

Available endpoints

• POST /anthropic/v1/messages

Claude Code

Compatibility depends on the target Claude Code version. Before production use, confirm that the model supports tool calls, streaming and compatible error responses.