LMU AI Docs
User Guide

Getting started

Get started with the LMU AI API in three steps: create an account, subscribe or top up, create an API key, then connect Claude Code, Codex CLI, and Cursor.

For plan advice and quotes, join the pre-sales group. After purchase, join the after-sales group first for hands-on help.

Pre-sales QQ group: 1042851564 — questions about plans, models and setup; open to join

LMU AI pre-sales QQ group QR 1042851564

After-sales QQ group: 1044817922 — approval requires your payment order number

LMU AI after-sales QQ group QR 1044817922

Step 1 — Create an account

Go to the sign-up page: https://api.lmuai.com/register?ref=vJaWWr4T

Enter your email and a password to finish registration.

Step 2 — Subscribe or top up

After logging in, click "Top up / Subscribe" in the left menu:

  • Subscribe: pick a plan and get a fixed monthly quota
  • Top up: add balance on demand and use any model flexibly

You're ready to go as soon as payment completes.

Step 3 — Create an API key

  1. Click "API Keys" in the left menu
  2. Click "Create key" and give it any name
  3. Once created, save your API key (the value that starts with sk-)

Step 4 — Configure your tool

API base URL:

Pick the base URL that matches your tool's protocol:

Anthropic protocol (Claude Code, Cherry Studio, Trae, Kilo Code with Claude / Chinese models, etc.):

https://api.lmuai.com

OpenAI protocol (Codex CLI, Codex App, VS Code / Cursor with GPT, Kilo Code with OpenAI models, etc.):

https://api.lmuai.com/v1

The difference (the most common mistake)

  • The Anthropic protocol has no /v1 suffix
  • The OpenAI protocol must include the /v1 suffix

Using the wrong protocol causes 401 / 404 errors. For full protocol details, SDK / curl examples and Claude Max group limits, see API protocols →.

Keep these three things handy — every tool setup below needs them:

  • API Key: the sk- key you created in the console (shared by both protocols)
  • Anthropic base URL: https://api.lmuai.com
  • OpenAI base URL: https://api.lmuai.com/v1

Next steps

Pick the setup guide for your tool:

ToolGuide
CC Switch (one-click import, recommended)CC Switch guide
Claude CodeClaude Code guide
Codex CLI (Mac / Linux)Mac / Linux guide
CursorCursor guide

Last updated:

API Protocols

LMU AI supports three inbound protocols — Anthropic, OpenAI Compatible, and Gemini native. One table to pick the right Base URL and endpoint and avoid errors.

On this page

Step 1 — Create an accountStep 2 — Subscribe or top upStep 3 — Create an API keyStep 4 — Configure your toolNext steps