Muse Spark 1.3 contributor might not be the smartest or fastest, but it does well most of the tasks and is super cheap.

I often brainstorm some ideas for apps for personal use on ChatGPT with a few prompts, and when happy with the rough shape of the concept, asking it to spit out a prompt to execute it on OpenCode with Spark. Usualy this gets done in a one shot or a little refinement and costs only a few cents. I hope the contributor version is here to stay.