I've been switching back and forth between Claude Sonnet 4.5 or Composer 1 and Gemini 3.0 and I’m trying to figure out which model actually performs better for real-world coding tasks inside Cursor AI. I'm not looking for a general comparison.

I want feedback specifically in the context of how these models behave inside the Cursor IDE.

Well, without rehashing the whole Claude vs. Codex drama again, we’re basically in the same situation except this time, somehow, the Claude Code + Sonnet 4.5 combo actually shows real strength.

I asked something I thought would be super easy and straightforward for Gemini 3.0 Pro.
I work in a fully dockerized environment, meaning every little Python module I have runs inside its own container, and they all share the same database. Nothing too complicated, right?

It was late at night, I was tired, and I asked Gemini 3.0 Pro to apply a small patch to one of the containers, redeploy it for me, and test the endpoint.
Well… bad idea. It completely messed up the DB container (no worries, I had backups even though it didn’t delete the volumes). It spun up a brand-new container, created a new database, and set a new password “postgres123”. Then it kept starting and stopping the module I had asked it to refactor… and since it changed the database, of course the module couldn’t connect anymore. Long story short: even with precise instructions, it failed, ran out of tokens, and hit the 5-hour limit.

So I reverted everything and asked Claude Code the exact same thing.
Five to ten minutes later: everything was smooth. No issues at all.
The refactor worked perfectly.

Conclusion:
Maybe everyone already knows this, but the best benchmarks even agentic ones are NOT good indicators of real-world performance. This all comes down to orchestration, and that’s exactly why so many companies like Factory.AI are investing heavily in this space.

Gemini 3 Pro is quite slow and keeps making more errors compared to Claude Sonnet 4.5 on Antigravity. It was fine at the start, but the more I used it, it is creating malformed edits and isn't able to even edit a single file?

I don't know if this is a bug or whether it's just that bad. Is anyone else facing problems?

Edit: FYI, I'm experiencing this both on the Low and High version on Fast. It is SO slow. It is taking up to few minutes just to give me an initial response.