As corporations previous and new rush to capitalize on AI, many AI startups say that their income is not only rising, but additionally quickly accelerating, hitting their subsequent milestones in shorter timeframes.
The next listing of startups have reported a sample of such flywheel progress. One factor to notice is that the underlying metrics utilized by these corporations differ, even when they’re utilizing the time period “ARR.” Some could also be referring to annualized recurring revenue (ARR), or income underneath contract from a paying buyer however not but billed. Some are referring to annualized run-rate income, or projecting annual earnings by calculating 12 months of income that continues on the price of the latest month. Others are referring to “dedicated ARR,” or signed contracts from clients that aren’t onboarded but. Within the case of Gusto, it reported precise trailing 12-month revenue.
Nonetheless, every of those startups, listed in reverse chronological order to when their ARR progress was made public, experiences that their income progress is accelerating, nonetheless they’re defining it. To make certain, there are numerous extra fast-growing AI startups than we’re naming right here, however we’re limiting this listing to the businesses hitting income milestones at ever-faster charges.
Mercor: On Monday, Brendan Foody, co-founder and CEO of Mercor, announced that the corporate has crossed $2 billion in gross annualized income as of June — simply 4 months after reaching the $1 billion milestone. The less-than-three-year-old agency, which hires area consultants to coach and refine AI fashions, said that it reached a $500 million run price in September.
Anthropic: In latest months, this mannequin maker’s income has been at such a historic velocity that it has mesmerized the complete AI sector. In late Could, Anthropic introduced that it crossed $47 billion in income run price, a milestone that got here lower than two months after the corporate reported that its income run price surpassed $30 billion. The corporate mentioned it reached a $9 billion income run price in late 2025, up from a reported $4 billion in July 2025.
Sierra: After reaching its first $100 million in ARR in seven quarters, Sierra — which builds customer support AI brokers for enterprises — says it took simply two extra quarters so as to add one other $100 million, co-founder and CEO Bret Taylor announced in late Could.
Glean: In Could, Glean announced that it crossed $300 million in ARR. Whereas it took the seven-year-old enterprise AI startup nine months to double its ARR from $100 million to $200 million, the corporate says it wanted simply six months to develop that metric from $200 million to $300 million.
Gusto: The 14-year-old HR tech startup introduced in Could that its income accelerated in every of the final 5 quarters. The corporate, which was final valued at $9.3 billion in early 2022, additionally reported that it surpassed $1 billion in trailing 12-month income. Gusto’s income surge reveals that it’s not solely AI-native corporations which are seeing their top-line progress supercharged by integrating the expertise.
Clio: This 18-year-old supplier of authorized apply administration software program noticed its income take off sharply after embedding AI into its offering in 2023. The corporate surpassed $200 million in ARR in mid-2024, doubled that determine by late final 12 months, and just lately introduced that its ARR reached $500 million.
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