As companies old and new rush to take advantage of AI, many AI startups say their revenues are not only growing, but accelerating rapidly, reaching their next milestones in shorter time frames.
The following list of startups has reported a pattern of such frill development. One thing to note is that the underlying metrics used by these companies differ, even if they use the term “ARR”. Some may refer to annual recurring revenue (ARR) or contract revenue from a paying but not yet billed customer. Some report annual run-rate revenue or project annualized revenue by calculating 12 months of revenue continuing at the most recent month’s run rate. Others refer to “committed ARR” or signed contracts from customers who haven’t signed up yet. In Gusto’s case, it reported actual trailing 12-month revenue.
However, each of these startups, listed in reverse chronological order of when their ARR growth was made public, reports that their revenue growth is accelerating, however they define it. Sure, there are many more fast-growing AI startups than we’re naming here, but we’re limiting this list to the companies that are achieving revenue milestones at an increasingly rapid rate.
Mercor: On Monday, Brendan Foody, co-founder and CEO of Mercor, was announced that the company has surpassed $2 billion in gross annual revenue since June — just four months after reaching the $1 billion milestone. The less than three-year-old company, which hires domain experts to train and improve AI models, he said that it reached $500 million in September.
Anthropogenic: In recent months, this model maker’s revenue has been at such a historic speed that it has mesmerized the entire field of artificial intelligence. In late May, Anthropic announced that it surpassed $47 billion in revenue percentage, a milestone that came less than two months after the company reported that its revenue percentage exceeded 30 billion dollars. The company said it reached a 9 billion dollars revenue execution rate at the end of 2025, compared to reported 4 billion dollars in July 2025.
Mountain range: After hitting its first $100 million in ARR in seven quarters, Sierra — which builds AI customer service agents for businesses — says it took just two more quarters to add another $100 million, co-founder and CEO Bret Taylor was announced at the end of May.
Glean: In May, Glean announced that it surpassed $300 million in ARR. While it took the seven-year-old business artificial intelligence startup nine months to double ARR from $100 million to $200 million, the company says it took just six months to grow that metric from $200 million to $300 million.
Heat: The 14-year-old HR technology startup announced in May that its revenue has accelerated in each of the past five quarters. The company, which was last valued at $9.3 billion in early 2022, also reported surpassing $1 billion in trailing 12-month revenue. Gusto’s revenue growth shows that it’s not just native AI companies that are seeing their top-line growth accelerate as they integrate the technology.
Clio: This 18-year-old provider of legal practice management software saw its revenue skyrocket after incorporating AI into its offering in 2023. The company surpassed $200 million in ARR in mid-2024, doubled that number late last year, and recently announced that its ARR reached $500 million.
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