OpenHands uses LiteLLM to make calls to chat models on OpenRouter. You can find their documentation on using OpenRouter as a provider here.
When running OpenHands, you'll need to set the following in the OpenHands UI through the Settings:
LLM Provider to OpenRouterLLM Model to the model you will be using.
Visit here to see a full list of OpenRouter models.
If the model is not in the list, toggle Advanced Options, and enter it in Custom Model (e.g. openrouter/<model-name> like openrouter/anthropic/claude-3.5-sonnet).API Key to your OpenRouter API key.