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Codex vs Hermes Agent
They do different jobs. Codex is OpenAI's coding agent; Hermes Agent is an open-source personal agent that lives in your chat apps. Pick by the job, not the brand.
At a glance
| Fact | Codex | Hermes Agent |
|---|---|---|
| Made by | OpenAI | Nous Research |
| What it is | OpenAI's coding agent for writing, reviewing and shipping code. | An agent from Nous Research that remembers over time, works in messaging apps, runs scheduled tasks and browses the web. |
| Price | Included with ChatGPT plans, with limits on Free | Free, paid from $20/month |
| Runs on | macOS, Windows, Linux, Web, CLI | macOS, Windows, Linux, CLI, Telegram, Slack, WhatsApp |
| Open source | No | Yes |
| Models | Not stated | Not stated |
| Last verified | October 14, 2026 | October 14, 2026 |
| Official site | openai.com/codex | hermes-agent.nousresearch.com |
Where they differ
- Job: Codex writes, reviews and ships code; Hermes remembers over time, runs scheduled tasks and browses the web.
- Price: Codex comes with ChatGPT plans; Hermes is free software with optional hosted plans.
- Where it runs: Codex as an app, CLI and cloud; Hermes in Telegram, Slack, WhatsApp and more, or your terminal.
Which to pick
Choose Codex if you want help with code.
Choose Hermes Agent if you want a personal agent in your messages that you can run yourself.
Keep looking
- Codex listing
- Hermes Agent listing
- Codex alternatives
- Hermes Agent alternatives
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Facts from each maker's official pages, last verified October 14, 2026. How we verify.