How to Use Izzi API with Cursor, Cline & Windsurf

One API key, all your coding tools

Instead of managing separate API keys for Anthropic, OpenAI, and Google — configure Izzi API once and use it across all your development tools. This guide covers setup for the three most popular AI coding extensions.

Cursor setup

Step 1: Open API settings

Go to Settings → Cursor Settings → Models

Step 2: Configure OpenAI-compatible endpoint

{
  "openai.apiKey": "izzi-YOUR_KEY_HERE",
  "openai.baseURL": "https://api.izziapi.com/v1"
}

Step 3: Add models

Click "Add Model" and add these model IDs:

• claude-sonnet-4-20250514 — Best for code editing
• claude-opus-4-20250514 — Best for complex refactoring
• gpt-5.4 — Fast completions
• deepseek-r1-0528 — Free debugging

Cline setup

Step 1: Install extension

Search for Cline in VS Code Extensions (Ctrl+Shift+X)

Step 2: Configure provider

1. Open Cline sidebar → Click gear icon
2. Select "OpenAI Compatible"
3. Base URL: https://api.izziapi.com/v1
4. API Key: izzi-YOUR_KEY_HERE
5. Model: claude-sonnet-4-20250514

Windsurf setup

Step 1: Open Cascade settings

Go to Settings → AI → Custom Provider

Step 2: Add Izzi API

{
  "provider": "openai-compatible",
  "name": "Izzi API",
  "baseURL": "https://api.izziapi.com/v1",
  "apiKey": "izzi-YOUR_KEY_HERE",
  "models": [
    "claude-sonnet-4-20250514",
    "gpt-5.4",
    "deepseek-r1-0528"
  ]
}

Troubleshooting

"Model not found" error

Make sure you're using the exact model ID. Common mistakes:

# ❌ Wrong
claude-sonnet-4
sonnet-4
claude-4-sonnet

# ✅ Correct
claude-sonnet-4-20250514

"Authentication failed" error

• Verify your key starts with izzi-
• Check your balance at izziapi.com/dashboard
• Ensure no extra spaces in the API key

Recommended model per tool

What's next

• Full comparison: Claude Code vs Cursor vs Cline
• 7 ways to cut your coding costs