AI-powered browsers are rapidly evolving beyond simple search assistants into proactive agents capable of shopping, researching, and automating complex tasks. After rigorous testing, five browsers—ChatGPT Atlas, Perplexity Comet, Kosmik, Dia, and BrowserOS—demonstrate distinct strengths in transforming how developers and power users interact with the web. Their emergence signals a fundamental shift towards context-aware, task-automating browsing experiences.