Antigravity CLI vs OpenCode
Antigravity CLI and OpenCode 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 | OpenCode | |
|---|---|---|
| Pricing | Free tier | Free |
| Platform | windows, mac, linux | windows, mac, linux |
| Works with | gemini | claude, chatgpt, gemini |
| 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. | Free, open-source AI coding agent for the terminal with a polished TUI — bring your own API key for Claude, GPT, or Gemini across 75+ providers, or run a local model through Ollama at zero cost. |
Which should you pick?
On budget alone, OpenCode is the lower-cost entry (free), so it's the safer place to start if you're not ready to pay. They both work with gemini, so if that's your setup either one fits. For the full picture, read the reviews below — the verdict is where the real difference shows up.