Also bonus: using it in Antigravity you can burn through all the Opus credit Google give you first to do all the planning and then switch it to Gemini 3.1 Pro to do the grunt work.
Yes, Gemini 3.1 Pro (High) is still inferior to Opus 4.6 (Thinking) that Google are offering, for planning. It just doesn't think things through as thoroughly as Opus. I'll use it when I've burned up all my Opus tokens and I still have planning I want to do, but I'll read the plan very carefully, whereas with Opus I'll only give it a cursory scan through.