How AI Startups Are Boosting Revenue Growth

As established and new companies aim to leverage the opportunities presented by AI, many AI startups are not only seeing revenue growth but are also quickly achieving subsequent milestones within shorter timeframes.

The startups mentioned below illustrate this trend of rapid growth. It’s noteworthy that their metrics differ, even though they reference “ARR.” Some may denote annualized recurring revenue (ARR) or revenue from paid customers not yet billed. Others could interpret this as annualized run-rate revenue, estimating yearly income based on the previous month’s revenue multiplied over a year. Additionally, there are mentions of “committed ARR,” which pertains to signed contracts from customers yet to commence. For instance, Gusto recently announced its actual trailing 12-month income.

Regardless of the definitions, each of these startups—listed in reverse order based on their ARR growth disclosers—illustrates that revenue growth is indeed on the rise. While there are many other fast-growing AI startups, this selection showcases those achieving revenue milestones at an even faster pace.

Mercor: Recently, Brendan Foody, co-founder and CEO of Mercor, declared that the company surpassed $2 billion in gross annualized revenue as of June—just four months after hitting the $1 billion mark. In under three years, this company, which employs domain experts to enhance AI models, also revealed a $500 million run rate in September.

Anthropic: In recent months, this model developer has witnessed such remarkable revenue growth that it has garnered the attention of the entire AI industry. In late May, Anthropic reported exceeding a $47 billion revenue run rate, a milestone reached less than two months after announcing a run rate over $30 billion. It predicted a $9 billion revenue run rate for late 2025, an increase from the $4 billion reported in July 2025.

Sierra: After reaching its first $100 million in ARR in just seven quarters, Sierra—recognized for developing AI customer service agents for businesses—announced through co-founder and CEO Bret Taylor in late May that it took only two additional quarters to secure another $100 million.

Glean: In May, Glean revealed it had surpassed $300 million in ARR. Although the seven-year-old enterprise AI startup took nine months to grow its ARR from $100 million to $200 million, it claims it took just six months to increase that figure from $200 million to $300 million.

Gusto: The 14-year-old HR technology firm announced in May that its revenue growth accelerated for five consecutive quarters. Valued at $9.3 billion in early 2022, it also reported exceeding $1 billion in trailing 12-month revenue. Gusto’s revenue increase underscores that companies beyond AI-focused ones can substantially enhance their growth by embracing this technology.

Clio: This 18-year-old provider of legal practice management software saw significant revenue growth after integrating AI into its services in 2023. By mid-2024, the company surpassed $200 million in ARR, doubled that figure by the end of last year, and recently announced that its ARR has hit $500 million.