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I think unify.ai (like openrouter) does that - it has several paramters you can choose from.

But the underlying "how to choose a model that's smart enough but not too smart" seems difficult to understand.

Its just sentiment analysis.

Portkey does that with configuration. You assign a base model, then add more models with weight to load-balance.

Some of that is already possible, since it can generate a difficulty score for a prompt that could be manually mapped between models based on ranges.

actually ModelBox(model.box) offers that, the autorouter function can dynamically switch to different models according to latency, geo-position and costs.