Echo: results so far Routing LLM requests cheaply without training a router — and the...
Echo routes without classifier: dual cheap model (personas), agreement → cheap else Sonnet. HumanEval hard: 94% oracle, 29% cost savings. Zero training; immediate deployment on workloads, eliminates adoption bottleneck traditional routers.
Echo: results so far
Routing LLM requests cheaply without training a router — and the measurement bug that nearly fooled us.
By Nick Meinhold, Robin Langer, Meghana Ganapa, and Adarsha Aryal · 10 June 2026
TL;DR
The idea: instead of training a classifier to route easy tasks to a cheap model and hard ones to an expensive model, call the cheap model twice with two different personas. If the answers agree, keep the cheap one; if they disagree, escalate. No classifier, no labels.
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