Run Hermes Agent with ChatGPT Plus via OpenAI Codex — No API Keys, No OpenRouter

I just unlocked a much better way to run Hermes Agent.

Instead of using OpenRouter or setting up OpenAI API keys, I connected Hermes Agent directly to OpenAI Codex using my existing ChatGPT Plus subscription.

That means:

• no separate OpenAI API key

• no OpenRouter dependency

• no extra per-token API setup

• Docker-based Hermes Agent on macOS

• GPT-5.5 available inside Hermes

For anyone already paying for ChatGPT Plus / Pro, this feels like getting a powerful agent runtime almost “for free” on top of the subscription you already have.

The setup uses OpenAI Codex device-code authorization:

hermes auth add openai-codex

After signing in through ChatGPT, Hermes can switch to the OpenAI Codex provider and use models like:

• gpt-5.5

• gpt-5.4

• gpt-5.4-mini

I wrote a full guide with commands, Docker setup, troubleshooting, and the small entrypoint fix I needed for skills_sync.py.

Hope this helps other people building serious local AI automation workflows with Hermes Agent.

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Run Hermes Agent with ChatGPT Plus via OpenAI Codex — No API Keys, No OpenRouter