On the subject of OpenCode Go, I believe OpenCode lets you switch between Go models and normal models on the fly. You could choose to go for a Go sub to use DeepSeek 4.1 flash at its subsidized subscription price until you hit the cap if you'd like to save some extra money. The 10$ sub gets me quite a bit of distance for hobby work, though might run out for you if you program for longer periods.

At the very least, you can benefit from the subsidized prices for smaller models as implementers, and use other subs or Zen/Console to access stronger models for planning and reviews. Something to consider at least, there are definitely ways to min/max of you're looking to squeeze extra value out.