# OpenRouter: One API, All Models

OpenRouter provides unified access to 100+ models from all major providers. One API key, one billing account.

## Why OpenRouter?

- **Model Variety** — Claude, GPT-4, Llama, Gemini, and more
- **Unified Billing** — One account for all providers
- **Auto Fallbacks** — Switch models if one is down
- **Cost Tracking** — Detailed usage analytics

## Setup

```json
{
  "provider": "openrouter",
  "model": "anthropic/claude-sonnet-4"
}
```

Get your API key at [openrouter.ai](https://openrouter.ai/).

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