I built a 200 line AI router in TypeScript. My monthly bill dropped 41%.

Paying for Cursor, Copilot, and direct API access simultaneously creates an invisible 'orchestration tax' — wrappers pick expensive models, pad context windows, and hide routing decisions from you. A 200-line TypeScript router that classifies prompts by intent and assigns them to appropriately priced models (Haiku vs Sonnet vs Opus) cut one developer's monthly AI bill by 41% on 30% more total calls.