XERJ + Qwen 3.8... give a cheaper model better context and it starts working smarter and faster Opus 5.5 and Qwen 3.8 get the same task of building an interactive website, with XERJ helping Qwen find the right context and make fewer guesses as it works. Qwen + XERJ finishes in 30 minutes for $24.77. Opus takes 37.5 minutes and $56.95 to reach the same result. free open source repo the site has animated scenes, scroll interactions and transitions between sections. XERJ helps the agent → find the relevant project code and reference material → look up definitions and parameters → understand existing behavior before writing a replacement → check its changes against the sources a model can write a scroll animation and still get your app wrong. it needs to know who owns the scene, what updates its state and how the project handles cleanup. retrieving those details before writing code gives the agent fewer assumptions to correct later. you can use the same setup with your expensive model too. when another question comes up, the agent searches again and checks the source. full XERJ breakdown below ↓