I have a $20 Cursor sub still personally and would say that the usage for Grok models is much higher than what $20 gets you with Anthropic. I can't speak for the $100 plan but I would assume it scales similarly.

I rarely run out of my usage monthly even with the $20 plan.

The best bet is Cursor Ultra ($200), which is the equivalent a month plan that you get from OpenAI and Anthropic. I get a LOT more capacity out of it because I almost always use the "Auto" mode, which auto picks between Opus 5, GPT 5.6, Grok 4.6, and Composer 2.5.

I like Auto mode so much actually. I use it for my Cursor work account as well because it's about 10x faster than just using Opus 5 or GPT 5.6 and about 90% is good. I switch back to the bigger models if I get in trouble, but that's pretty rare.

Vibe coding requires some discipline. You need understand what it's trying to do. If you have a good mental model you can keep it out of trouble. If you don't, it doesn't matter how good the model is. You're gonna end up in a mess.

Grok is a workhorse, not the smartest yet, but produces good code and follows the plan. Grok 5, which has been training since beginnig of this year, will probably be a monster. (10T/6T Param model variants)