Cursor's annual recurring revenue exploded from $100 million to $3 billion in a year, with 67% of Fortune 500 companies now using it. The key to its success is its 'harness'—a sophisticated scaffolding that transforms AI models into autonomous coding agents with memory and custom tools. This harness, not the underlying AI model, is its true competitive advantage. Cursor has also developed its own frontier model, Cursor 2.5, which rivals top models like Claude Opus 4.7 but is 8-12x cheaper. A potential deal with SpaceX and xAI could give Cursor access to Grok and massive compute, creating a powerful competitor to OpenAI and Anthropic. While concerns exist about its reliance on Moonshot AI's Qwen 2.5 model, a partnership with xAI could create a superior product. The speaker remains bullish, noting Cursor's comeback and its potential to become a new SaaS version of a forward-deployed engineer.