A: christina968 thanks for Asking! OpenRouter has been added in one of the recent updates (T4).

2.1.4 Changelog — OpenRouter
Released at: 2024-07-12

CustomAI now supports OpenRouter.ai. Just set Server URL to https://openrouter.ai/api/v1/chat/completions, Authorization Header to the Bearer YOUR_API_KEY and model to anthropic/claude-3.5-sonnet (or any other model available)
You can delete all history with one button
The chat history doesn't close in full-screen mode
Conversations in chat history are now ordered from latest to oldest, with modified conversations moving to the top of the list
Conversations are updated only when a new message appears, not when a conversation is restored
Custom AI now handles non-streaming interactions properly
Authorization tokens for Snippets and CustomAI are now hidden by default
You can now change your email in the settings if needed
New icons are now available for Snippets, and they're ordered alphabetically
The Control + K keyboard shortcut now works on Windows
Known issue: OpenRouter model isn't preserved for Snippets. When the model changes, the Snippet's model is removed. It will be fixed in the 2.1.5