Cursor is almost certainly the fastest company in history to reach $1B in ARR. GPT-5.1 did research and generated the following graph to show how long it took these companies to go from founding to $1B ARR.

People said Cursor would “go to zero” because it's “just a wrapper.” AI products won’t be monopolized by model labs imo. 1. Products win by delivering real user value - model capability alone isn’t enough. 2. Once they hit PMF, companies can train their own models (often based on open-source models, combined with their unique data and RL environments; Cursor’s Composer-1 is an example).