Ollama just added support for the Codex app.

Update to Ollama 0.24,

run one command,

pick an open source model,

and you are running Codex locally.

No API key. No usage limits. No bill at the end of the month.

This is a big deal.

Codex just went from a paid OpenAI product to something anyone can run on their own machine with any open model they choose.

If you want to understand what Codex actually is before you set it up,

I wrote the full plain language breakdown here.