OpenRouter

OpenRouter routes requests to hundreds of models from OpenAI, Anthropic, Google, Meta, Mistral, and other providers through a single OpenAI-compatible endpoint.

Get an API key

Create an account at openrouter.ai and generate a key from the Keys page. The key starts with sk-or-v1-. Add it to your .env file:

OPENROUTER_KEY=sk-or-v1-your-key-here

Configuration

Add the endpoint under endpoints.custom in your librechat.yaml:

    - name: "OpenRouter"
      apiKey: "${OPENROUTER_KEY}"
      baseURL: "https://openrouter.ai/api/v1"
      models:
        default: ["meta-llama/llama-3-70b-instruct"]
        fetch: true
      titleConvo: true
      titleModel: "meta-llama/llama-3-70b-instruct"
      dropParams: ["stop"]
      modelDisplayLabel: "OpenRouter"

To pin a fixed model list instead of fetching the full catalog, set fetch: false and list the models yourself:

      models:
        default: ["anthropic/claude-3.5-sonnet", "openai/gpt-4o", "meta-llama/llama-3-70b-instruct"]
        fetch: false

To let each user supply their own key through the LibreChat UI instead of reading one from .env, set apiKey: "user_provided". Users then see a key input field when they select the endpoint.

Notes

• With fetch: true, LibreChat loads the full model list from OpenRouter so new models appear automatically. The default array is only the initial selection.
• dropParams: ["stop"] strips the stop parameter from requests. OpenRouter models use varied stop tokens, and dropping it avoids compatibility errors.
• A 402 Payment Required response comes from OpenRouter, not LibreChat. Add credits or pick a free model in your OpenRouter account, then retry.