1. Install Codex
- Codex requires Node.js 22 or later. Install it from the official installer or via Homebrew (
brew install node).
- macOS users can also install Codex with Homebrew:
brew install codex. - In your terminal, run:
- After installation, check the version:
2. Connect to Syon
Configure the provider
macOS / Linux
Open a terminal, paste the full block below, and press Enter: plaintextWindows
Open PowerShell and run: plaintextSet the API key
Replace<your-Syon-key> with the API key you created in the Syon dashboard.
macOS
plaintextLinux
plaintextWindows
plaintextcodex in the terminal. It will use Syon.
3. Enable Fast mode (optional)
Fast mode makes GPT-series models respond faster (gpt-5.6-sol runs up to 2.5x faster than Standard), billed at 2x the standard rate.
To enable it for the current session, type this inside Codex:
bash
/fast is a toggle — type it again to turn it off.)
To enable it permanently, add this line at the top of ~/.codex/config.toml:
toml

