Many newcomers to AI share a common confusion: I know ChatGPT is useful, but how do I actually use it on my own devices? What's the difference between various clients? And what exactly is an API Key?

This guide walks you through choosing the best AI client for your needs and completing the setup. We'll use the Ciyuano relay service as an example, but the methods apply to any OpenAI-compatible API service.

Step 1: Get Your API Key

Before using any third-party client, you need an API Key. Think of it as your passport that tells the client who you are and which models you can access.

How to get one:

Register and log in to the Ciyuano platform
Go to Console → API Keys
Click "Create New Key" and give it a name (e.g., "My Phone")
Copy the generated key, which looks like sk-relay-xxxxxxxxxxxx
Save it securely — never share it with others

Security tip: If your API Key is leaked, others can use it to consume your balance. Create separate keys for different devices to make management and damage control easier.

Step 2: Choose Your Client

Pick the right client based on your use case:

Scenario 1: Daily Chat, Writing, Translation — Use a Browser

If you mainly chat with AI, write content, or translate, the simplest approach is using a browser to access ChatGPT or the Ciyuano platform directly. Zero setup required.

Scenario 2: Coding and Debugging — Use Editor Plugins

For developers, calling AI directly from your editor is more efficient. Cursor and VS Code + Continue are the top choices.

Scenario 3: Use on the Go — Mobile Apps

Official apps from ChatGPT and Claude offer the best experience. Third-party apps like ChatBox support custom API endpoints for greater flexibility.

Scenario 4: Automation and Batch Processing — Use the Command Line

For integrating AI into workflows, direct API calls via cURL or programming languages offer maximum flexibility.

Step 3: Verify Your Connection

After setup, send a simple test message. If you get a normal response, you're good to go. Common issues include incomplete API keys, wrong URLs, network problems, or insufficient balance.

Pro Tips: Managing Multiple Clients

Create separate keys for each device
Use a relay service to access multiple models with one key
Set up usage alerts to avoid unexpected charges
Rotate keys every 3-6 months for security

Choose the right client, configure your API Key, and you can use AI anywhere — no coding or command-line skills needed. Done in 5 minutes.

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