A model's class (critical, standard, opportunistic; unset follows its scaling) decides what may be stopped to make room for it: a lower class for a higher, and within a class only what another grew into under load, for a model below its minimum. Victims are tried on a copy of the inventory and stopped only if they make the room. Preempted replicas are drained with a short grace and their model is held back until the room is used. ctl model resources and class move under ctl model. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>