Is it worth upgrading to Codex 20x?
I use /fast so much that it feels like a compiler for thoughts.
My real bottleneck isn't writing code, it's getting feedback. When feedback loops are slow, I end up batching work into much larger chunks, which makes iterations more expensive and increases the cost of being wrong. /fast lets me keep the loop tight and adjust course sooner.
My biggest hesitation tho about upgrading is the pricing stability. I've switched between enough AI products to notice the pattern: you sign up for one set of limits, get used to a workflow, then a few months later the pricing or quotas change and you're effectively getting less than what you originally signed up for.
It's hard to build habits around a tool when the economics keep moving underneath you.