Most of the LLM Routing Gap Is Task Type
An LLM router picks which model should answer each query. The appeal is that models fail on different questions. Whatever single model is best overall still gets some wrong, and another model in the pool gets many of those right. Getting that choice right every time is the ceiling, and a router is an attempt to approach it. However, recent work reports that routers do not get close. Across 21 routing methods on five benchmarks, sharply different designs land within a fraction of a point of each other, and all of them stay far below that ceiling. Learned routers often fail to beat simply always calling the strongest model. We ask what those missed questions have in common. We set fourteen ...
| Authors | Janghoon Lee |
|---|---|
| Primary category | cs.CL |
| Published | 24 August 2026 |
| Last updated at source | 25 August 2026 |
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