AI Engineering

Building a Model Router: Picking the Cheapest Model That Still Works

A practical, step-by-step guide to building a model router that picks the cheapest LLM likely to succeed on a given request, complete with TypeScript code and fallback logic.

Sachin Sharma
Sachin SharmaCreator
Jul 9, 2026
7 min read
Building a Model Router: Picking the Cheapest Model That Still Works
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A practical, step-by-step guide to building a model router that picks the cheapest LLM likely to succeed on a given request, complete with TypeScript code and fallback logic.

Sachin Sharma

Sachin Sharma

Full Stack Developer & Mobile Engineer

Building digital experiences at the intersection of design and code. Sharing weekly insights on engineering, productivity, and the future of tech.