LibreChat - ModRouter

LibreChat works well with ModRouter through the plain OpenAI-compatible /v1 API.

Endpoint

https://api.modrouter.online/v1

Set MODROUTER_BASE_URL from the LibreChat runtime environment to the ModRouter root URL reachable by LibreChat.

Example Provider

Add a custom OpenAI-compatible endpoint in librechat.yaml:

endpoints:
  custom:
    - name: "ModRouter"
      apiKey: "${MODROUTER_API_KEY}"
      baseURL: "https://api.modrouter.online/v1"
      models:
        default:
          - "openai/gpt-4o-mini"
          - "anthropic/claude-sonnet-4-5"
          - "gemini/gemini-2.5-pro"
        fetch: true
      titleConvo: true
      titleModel: "openai/gpt-4o-mini"
      summarize: false

Set the API key to a ModRouter virtual key when governance auth is enabled.

Images and Vision

LibreChat can send image generation and vision requests through ModRouter when the selected model/provider supports the corresponding OpenAI-compatible endpoint. Use explicit model IDs such as openai/gpt-image-1 or another image-capable provider/model configured in ModRouter.