Krishna-neural/Vantage_ai ? reverse-engineered prompt

Build me a clean web app called Vantage AI that lets someone type in a prompt, run it through different AI engines, and compare the results side by side.

I want it to feel simple and polished, with a nice landing page, a prompt box, a run button, and a results area that clearly shows each engine response, loading states, errors, and basic stats like response time if that is available. Make it easy to switch between engines or test all of them at once, and keep the layout responsive so it looks good on desktop and mobile.

Use the existing project files and make sure it runs smoothly in the browser. If you need to check current API details or best practices for any AI provider, look them up online and wire it up the right way. Add sensible sample data or fallback behavior so the app still feels complete even before real keys are configured.