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eve, the agent framework Vercel created and maintains, announced criteria-based model routing using Jev. The code in the post imports autoModel from eve/experimental/evaluate and passes it to defineAgent as the agent’s model.
autoModel takes typesafe-ai/jev as the model that decides, plus a map of options: each option is a model ID with a plain-language description of when to use it. The example routes between one model for “Complex reasoning and engineering tasks” and another for “Routine tasks where speed matters”. The post calls the routing ultra-fast.
