How to Use Hermes Agent with OpenRouter: Setup, Models & Routing

Hermes Agent is OpenRouter’s most-used application by token volume, having processed more than 17 trillion tokens so far. OpenRouter is one of the primary ways people run Hermes Agent, so the setup is mature, widely used, and fully supported. Hermes Agent is an open-source autonomous agent from Nous Research that runs directly in the terminal, and it can work with any model you choose. When you connect it to OpenRouter, you get access to more than 400 models from over 70 providers, along with automatic failover and a single bill, all through one API key. One thing to clear up before anything else: Hermes Agent and the Hermes model family (Hermes 3 and Hermes 4) are different parts of the same ecosystem from Nous Research. Hermes Agent is the application, while Hermes 3 and Hermes 4 are language models it can run on. This guide explains the distinction and then walks through the complete setup and routing configuration. Hermes Agent is Nous Research’s open-source autonomous CLI agent. The Hermes 3 and Hermes 4 models are separate; the agent can run on either, or on any model via a gateway. The default model for basic setup is ~anthropic/claude-sonnet-latest. openrouter/auto and openrouter/pareto-code…