Why should it? An Anthropic model is architecturally optimized for Anthropic models, routing it to Kimi makes zero sense

Which is why 3rd party routers which do route between different models may have an edge. It means they can compete on cost, and it’s definitely not clear that the architectural optimization is always going to be higher quality or cheaper. It might be, but everything changes constantly, so locking into a single model family/company is very much not ideal