At $20/month your daily cost is $0.67 cents a day. Are you really complaining that you were able to get it to implement two small features in your app for 67 cents?
If you got in a taxi, and they charged you relative to taking a horse carriage, people should be upset.
For a first test, it did seem like it burned through the usage even faster than usual.
GitHub Copilot’s 7.5x billing factor over 3x with Opus 4.6 seems to suggest it indeed consumes more tokens.
Now I’m just waiting for OpenAI to show their hand before deciding which of the plans to upgrade from the $20 to the $100 plan.
Full time work where you have the LLM do all the code has always required the larger plans.
The $20/month plans are for occasional use as an assistant. If you want to do all of your work through the LLM you have to pay for the higher tiers.
The Codex $20/month plan has higher limits, but in my experience the lower quality output leaves me rewriting more of it anyway so it's not a net win.