Limits are so low that I cancelled after about two weeks on my initial $0 trial. I tried making a change to a tiny code base with Claude Sonnet (which they offer in Antigravity). It couldn't even finish the change before my weekly limit was used up, reset in 7 days.
I tried the Anthropic models because gemini-pro had already been rate limited with a 5 day wait. I got some actual usage out of the Google model, but laughably little compared to what I got with ChatGPT Plus. This is definitely not an imagined thing from my side, you just have to look at the Antigravity forums:
I find it pretty good. And Gemini 3.1 pro seems quite capable. Not as good at some things as Claude, but better at others. I was trying to target a verilog design to an uncommon FPGA and board and Gemini went out and searched for the FPGA docs and examined the schematics for the board in able to do the pin assignments (generated .ccf file). Not sure of Claude could've done that.
Probably the best value for a good amount of anthropic credits. You can also share your Google ai subscription with up to four family members and they all get the same amount of credits...