It makes sense to optimize model routing at the harness layer instead of the gateway layer if you want to hillclimb on accuracy/cost for any…

It makes sense to optimize model routing at the harness layer instead of the gateway layer if you want to hillclimb on accuracy/cost for any e2e task. Every task is solved by a combination of a model mixture and agent harness. Every task requires a different mixture of models (+harness logic) to be at the pareto frontier of accuracy and cost. * If you only optimize the model mixture at the gateway layer, you lose the broader context encoded in the harness and only optimize at the LLM completion layer. * If you optimize the model mixture at the harness layer, you can make the "optimal" model choices a priori and while in the agent loop For any given task, the model and harness are probably co-optimized together, so that the model mixture can only exist with this specific harness shape and vice versa https://x.com/i/article/2087759212705419264

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Source: Jerry Liu (X) | 2026-08-15

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