How Smart Model Routing Picks the Right AI for Your Programming Language

The dirty secret of AI code review is that there is no single "best" model. There are only models that happen to be good at the specific thing you're asking them to do right now. I learned this the hard way while building 2ndOpinion , an AI code review tool where Claude, Codex, and Gemini cross-check each other's work over MCP. The first version hard-coded one model for every review. The reviews were fine for JavaScript.