A growing number of AI startups are reporting that their revenue isn’t just growing — it’s accelerating faster than ever. Companies like Mercor, Anthropic, Sierra, Glean, and Gusto are hitting revenue milestones in increasingly shorter timeframes. For instance, Mercor crossed $2 billion in gross annualized revenue just four months after hitting $1 billion. Anthropic went from a $30 billion to $47 billion revenue run rate in under two months. Sierra added its second $100 million in ARR in just two quarters, half the time it took for the first $100 million. Even established players like Gusto, a 14-year-old HR tech company, saw revenue accelerate over five consecutive quarters after integrating AI. These numbers are impressive, but it’s worth noting that companies define metrics like “ARR” differently — some use annualized run-rate, others use committed contracts or trailing revenue. Still, the pattern is undeniable: AI is creating a flywheel effect where growth begets more growth, faster than previously possible. Why it matters: This revenue acceleration signals that AI is transitioning from experimental technology to a core driver of business value, reshaping expectations for how quickly startups can scale in the modern economy.