Anysphere is the startup behind Cursor, a popular AI coding assistant now used by more than half of Fortune 500 companies. However, investors claim that no AI startup has grown as rapidly as Anysphere, the three-year-old company behind popular AI coding assistant Cursor. In January, Anysphere became the fastest-growing company to hit $100 million in annual revenue, reaching the milestone in 14 months. Anysphere is the fastest-growing startup of all time, according to its investors. Related: This AI Startup Spent $0 on Marketing.