Excellent. This is a fantastic comparison task. Let's break down the technical differences between Gemini CLI and Codex CLI based on their file structures and documentation, and then determine which one might be "better" for different use cases.
| Feature | Gemini CLI | Codex CLI |
|---|---|---|
| Core Language | TypeScript (Node.js) | Hybrid: Rust & TypeScript |
| Architecture | Client/Server (both in TypeScript) | Hybrid: Rust core/TUI with a parallel JS/React TUI |
| Sandboxing | Docker/Podman or macOS Seatbelt | Rust-based execpolicy engine, macOS Seatbelt, Linux Landlock |
| UI Framework | React & Ink (TypeScript) | React & Ink (JS) AND Ratatui (Rust) |