Fallback logic is easier to reason about when the application has one request shape and the model choice stays configurable. That is especially useful for teams testing different AI providers, latency profiles, or cost envelopes.
RouterBase gives developers an OpenAI-compatible API surface at https://routerbase.com/v1, which makes it a good place to prototype fallback behavior before changing a larger production system.
A tiny fallback wrapper
const baseUrl = "https://routerbase.com/v1/chat/completions";
async function runPrompt(model, prompt) {
