Anysphere, the maker of the AI-powered 'vibe coding' app Cursor, has closed a $900 million funding round, bringing its valuation to $9 billion. The round was led by Thrive Capital, with participation from Andreessen Horowitz (a16z) and Accel. Cursor, which previously raised $105 million at a $2.5 billion valuation, is part of the 'vibe coding' movement popularized by Andrej Karpathy, reflecting the growing use of AI in software development. The movement has contributed to the rise of tools such as Cursor, Replit Agent, and Claude Code. Other AI coding startups, including Windsurf, have also drawn investor attention, with reports of OpenAI expressing interest in acquiring Windsurf. The funding activity signals a shift in developer practices toward increased adoption of AI-driven coding platforms.