Antigravity CLI vs OpenAI Codex CLI
Antigravity CLI and OpenAI Codex CLI are both terminal AI coding tools. Here's how they line up on the things that actually decide it — price, platform, and what they plug into.
| Antigravity CLI | OpenAI Codex CLI | |
|---|---|---|
| Pricing | Free tier | Free tier |
| Platform | windows, mac, linux | windows, mac, linux |
| Works with | gemini | chatgpt |
| In one line | Google's closed-source terminal coding agent (the `agy` command) — the official successor to the retired Gemini CLI, part of the Antigravity platform and backed by Gemini 3 models. | OpenAI's free, open-source terminal coding agent — runs agentic file editing, shell commands, and multi-step tasks powered by o4-mini. |
Which should you pick?
Both sit at a similar price point, so cost won't decide it. They target different setups, so let what you already use break the tie. For the full picture, read the reviews below — the verdict is where the real difference shows up.