# Routing

Auto stays in the tier you set.

Cost tiers: low, balanced, high. Lower is cheaper. Higher is more capable. Send hopscotch/auto and the project tier is the band. Name a model instead and that is what runs.

A model slug you already know, or a hop list with failover, is the add-on. It is not how the cost tier is chosen. Auto is hopscotch/auto, a slug you send on purpose, not a cheaper stand-in. When a slug is sold by more than one upstream, the catalog lists them. A 200 is still the model you named.

Failover classes: transient (retry once, then treat as capacity), capacity (reroute now, cool the route down), deterministic (never retry, never reroute), fatal-internal (surface 500, do not retry).

HTML: https://hopscotchlabs.ai/routing