Ideally I'd have Fable 5 make the plan, but creating a concrete plan is the most...

Ideally I'd have Fable 5 make the plan, but creating a concrete plan is the most token-expensive part since the agent has to do the most research.

Fable 5 is 2x the cost per token of Opus 4.8, and it's much less work to review a plan than generate one.