Codex — Connect ChatGPT
Sign in to ChatGPT through the Codex CLI and use it as an engine.
In short
If you have a ChatGPT plan, you can use it through the Codex CLI. Press Connect ChatGPT, sign in in the browser, and Thesivor runs requests through Codex. The app never sees your password and never opens Codex's config folder.
1Install Codex
npm install -g @openai/codex or brew install --cask codex. Thesivor shows install help and a Re-scan button if it cannot find it.
2Connect ChatGPT
Settings → AI engines → ChatGPT (personal account) → Connect ChatGPT runs codex login, which opens the browser. A failed sign-in shows Codex's own last error line, never the auth URL.
3Pick a model
The picker uses Codex's model catalog when that version exposes it, otherwise Thesivor's own list, labelled as such.
For technical users
The connected state comes from codex login status; only the auth mode is kept, never a key. Requests go through the existing Codex CLI engine (codex exec). Verified against a fake Codex in tests; live verification is pending because Codex was not installed on the build machine. The separate in-app ChatGPT sign-in path is not available and is not offered.