It seems there are two distinct groups, one which is doing relatively well with Luna, Deepseek Flash and similar models while other seem to be satisfied only with the state of the art.
(I'm in the second boat so long as I'm responsible for the code I PR)
Is there any alternative model with design sensibilities?
If you're happy to "lead it by the nose" you can do well with a lot of very low end models.
If you want to kick off a "/goal run until [complex verification passes]" and let it run for a week with minimal intervention, then not so much.
You can make do with cheaper models for long running agentic runs too, but it tends to require a lot of extra scaffolding and additional review steps.