The sub-agent separation is still valuable to keep context clean for the orchestrator, but I just have no reason to use Sonnet as the grunt-work implementer because I'm finding it hard to run out of tokens with Opus 5.5 on a $200 subscription plan. It's really really good at subjective quality of work per token used.
Did you use some kind of plugin? I'd like to use opencode with my Claude subscription.
I have actually just dropped to using sonnet for everything, sure it does need some directing but I have yet to see a need to jump to opus.
To me it feels like sonnet/terra and composer 2.5 and grok 4.7 are actually good enough for most tasks and these companies are pushing the high models simply to make money.
They're cheaper per token, but they burn more tokens and take more wall time than just going up a tier at a lower reasoning level. And if the task is simple enough that they do come out cheaper than Sol, I can switch to Luna and come in even cheaper.
Maybe I'll come to miss it now that I removed it, but I certainly don't yet.