Run the Claude Agent SDK on any model

Two variables, any model

The Claude Agent SDK runs on the same client as Claude Code, so it reads the same connection variables — ANTHROPIC_BASE_URL and ANTHROPIC_API_KEY. Point them at AnyRouter with an sk-ar-v1 key and query() reaches every model in the catalog behind the Anthropic /messages dialect. Model ids are provider/model strings, so switching models is one option value.

npm install @anthropic-ai/claude-agent-sdk

import { query } from "@anthropic-ai/claude-agent-sdk"

for await (const message of query({
  prompt: "List the files here and summarize the project.",
  options: {
    // any catalog id: "openai/gpt-5.5", "z-ai/glm-5.2", "anthropic/claude-opus-4-8"
    model: "z-ai/glm-5.2",
    env: {
      ...process.env,
      ANTHROPIC_BASE_URL: process.env.ANTHROPIC_BASE_URL ?? "https://anyrouter.dev/api",
      ANTHROPIC_API_KEY: process.env.ANTHROPIC_API_KEY ?? "sk-ar-v1-placeholder",
    },
  },
})) {
  if (message.type === "result") console.log(message.result)
}

Claude Code works the same way

The Agent SDK and the Claude Code CLI share a client, so the same two variables point the CLI at AnyRouter too — no plugin, no fork. For the terminal walkthrough, see /blog/claude-code-through-one-gateway.

Get an sk-ar-v1 key and run the Agent SDK on any model in the catalog.

Create a key

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