LLM output comparison app

Build me an app to compare outputs of LLMs. It should have a field to enter a prompt and a submit button (which has a loading state when clicked). When the button is clicked, send the prompt to Open AI's gpt-4o-mini and Open AI's gpt-4o. It should return to me the output of the created messages from both LLMs and show me the 2 outputs side by side. Make sure to show a loading state when calling the AI. Remember to write a great system prompt.