GrammarlyGO is a generative AI tool built on GPT-3, offering features like personalization, composition, rewrite, ideate, and reply. While its output may not excel in terms of quality compared to other AI writing tools, it has the advantage of being integrated with Grammarly's existing editing capabilities, making it more convenient for users. The Ideate feature stands out as particularly useful, providing macro-editing suggestions that can help users improve their work. With its scale, familiarity, and integrations with other platforms like Gmail, GrammarlyGO is poised to make AI-powered editing even more accessible to millions of users.