Learn how to use the AI Chat application
Get an API Key
Visit openrouter.ai to create a free account and get your API key.
Configure Your Key
Enter your API key when prompted on the home page, or configure it in the application settings.
Start Chatting
Select a model, type your message, and press Enter to start chatting with AI!
Access hundreds of free AI models categorized by performance: Ultra, Pro, Fast, Normal, and Slow tiers. Each model has different capabilities and context lengths.
Search and filter models by category, name, or capabilities. See detailed information including context length, vision support, and provider details.
Auto-resizing text input with character counter. Press Enter to send or Shift+Enter for new lines. Suggested prompts help you get started.
Browse all available free models with detailed specifications, descriptions, and direct links to model pages.
The application uses OpenRouter API to access multiple AI models. You can configure API keys in two ways:
Method 1: User API Key (Recommended)
Enter your personal API key when prompted. This key is stored in your browser's local storage.
Method 2: Pre-configured Keys
Developers can add API keys directly in the config/index.ts file under the apiKeys array.
Cutting-edge flagship models with the highest capabilities (GPT-5, Claude Opus 4, O3, Gemini 3)
High-performance production models (GPT-4o, Claude 3.7, DeepSeek R1, Gemini 2.5)
Quick, efficient models optimized for speed (Flash, Mini, Nano variants)
Balanced models for general use cases
Older or less optimized models, still functional but slower