Quickstart

1. Install

Pick your platform and download the installer:

• macOS · Apple Silicon / Intel
• Windows · x64 / ARM64
• Linux · deb / rpm / AppImage

On macOS the app is notarized; on Windows it's code-signed. No SmartScreen scary screens.

2. Sign in

Press ⌘ ⇧ P (or Ctrl ⇧ P) and run CodexaX: Sign in. Your browser opens, you enter your phone number, get a 6-digit code, and the editor receives a token via the codexax:// URL scheme.

3. Pick a model

The default is our hosted Claude Sonnet 4.5. To switch:

• In the chat sidebar, click the model picker at the bottom.
• Choose any of the 11 built-in providers.
• For BYOK providers (Anthropic / OpenAI / Gemini / xAI / Ollama / OpenAI Compatible), paste your key once.

4. Send your first message

Open any project, hit ⌃ ⌘ I to focus the chat, and try:

Refactor selectedFile to use early returns and extract the validation block

You'll get a diff. Click Apply all or Review.

5. Try inline edit

Select code → ⌘ K → type the change. The model rewrites the selection in place, you accept or reject.

What's next?

• Agents — for multi-file work.
• Skills — author once, ship to your team.
• MCP — give CodexaX new tools.