Prohibitively expensive is all relative. Pre-Fable, I was getting fine on the 5x plan for 1-2 concurrent long-running tasks plus interactive work (I do a lot of coding for work, but it is not my full work day). I don’t think a cache miss every hour on Opus hurts that much, even at 500-600k context. It would be nice if they got /clear working on remote-control.

Is the high expense coming from cache misses? If their workload does need to wait for a long time before it can continue, I wonder would starting new sessions and having to re-read the contexts and results anyway be any cheaper.