OpenAI's ChatGPT Agent feature is now available for Mac users on Pro, Plus, and Team plans, enabling automation of web browsing, data analysis, and task execution using GPT-4o. The Agent allows up to 400 queries per month on Pro plans and 40 on Plus and Team plans. Its capabilities include browsing e-commerce sites, drafting presentations, and executing code, making it a valuable productivity tool as it evolves, though initial restrictions apply to sensitive tasks.