Earlier quoted context omitted.
In the future we'll all use multiple models.
We would be doing it now if it wasn't cutting into frontier companies' revenue. Eg if you use Claude, you probably want fable architecting, a couple of opus under it managing sub project and sonnet doing the actual function code, because fable coding a "run a query and filter the result" is a massive waste of abilities. But their own sub agent downgrade is limited to one level so if you use fable it will never direct…
I've been doing this myself, all the time. (The ability to get second opinions and code reviews from Sol and other models is priceless.)
There's nothing restricting it to only controlling subagents that are other Claude models like Opus and Sonnet.
Also, I'm not sure that there's a one-level downgrade. Subagents can be pinned to any model: