In summary, Jev Router makes smart choices. 4 of its 5 most-used models sit on the Pareto frontier, and its steerability is notably strong.
But that doesn't yet add up to a better trade-off. Calling DeepSeek V4.1 Flash directly gets similar performance at lower cost and latency.
Our results show why model routing is hard: balancing task success, steerability, cost and latency all at once remains an open challenge.