Chorus is a Mac-based AI chat application that allows users to interact with multiple AI models simultaneously. It supports frontier models like GPT-4o, Claude Sonnet 3.5, and Gemini Flash, as well as local open-source models. The tool offers synthesis, merging different AI responses into a single answer for better insights. It enables URL extraction, document uploads, and full-text search within chat history. Built on Tauri with a Rust backend, Chorus is designed for speed and efficiency. With seamless model integration and a lightweight interface, it provides a versatile AI-powered chat experience for various use cases.