I did most of my first project just passing files to ChatGPT in the browser with the $20 subscription. Then I started running codex and discovered that I would burn through my daily usage limit in about an hour of work. The $200 subscription gives you 20x usage. I've hit my weekly limit on that a couple of times usually the day before it resets. I had a lot of shit going on in my personal life so there were a couple of weeks I couldn't focus on coding at all but I'm back to it now.