The Anthropic 20 USD plan would more or less be a non-starter for agentic development, at least for the projects that I work on, even while only working on a single codebase or task at a time (I usually do 1-3 at a time).
I would be absolutely bankrupt if I had to pay per-token. That said, I do mostly just throw Opus at everything (though it sometimes picks Sonnet/Haiku for sub-agents for specific tasks, which is okay), so probably not a 100% optional approach, but I've wasted too much time and effort in the past on sub-optimal (non-SOTA) models anyways. I wonder which is closer to the actual cost and how much subsidizing there is going on.