The "Agentic" Difference
The key difference between Cursor and Antigravity is simple: Agency.
In Cursor (and GitHub Copilot), you are the pilot. The AI suggests lines, or maybe rewrites a function if you ask nicely. It's a "Co-pilot".
Antigravity feels more like hiring a junior developer. You don't type code; you type instructions into a dedicated "Agent Manager" panel. For example:
And it just does it. It opens the files, edits them, opens the terminal, runs `npm test`, sees the failure, fixes it, and reports back.
Gemini 3 vs Claude 3.5
Cursor relies heavily on Claude 3.5 Sonnet, which is brilliant at reasoning. How does Google's new Gemini 3 stack up?
- Speed: Gemini 3 is noticeably faster at generating large chunks of boilerplate.
- Context: With a 2 Million token window, you can literally feed it your entire repo + documentation. Cursor's 200k limit feels claustrophobic in comparison.
- Accuracy: This is where it gets tricky. In my testing, Gemini 3 hallucinations were slightly more frequent for esoteric libraries compared to Claude.
The Verdict
Is it a Cursor killer? Not yet. It's still in Preview, and the UI feels a bit "Google-y" (read: cluttered).
However, for greenfield projects where you want to sprint fast, the Agentic workflow is a game changer. If you are tired of tabbing through suggestions and want someone to just "do the work", download Antigravity.