Robots stop asking the big model every step: a local CALL head pages Astra only for recovery, lifting 200 LIBERO episodes to 97.5%
A frozen π0.5 policy gains a local CALL head that pages GPT-6 Astra only at critical recovery moments, raising success from 95.5% to 97.5% across 200 LIBERO episodes while confining Astra to a small share of environment steps.