A select group of artificial intelligence (AI) startups are reporting an unprecedented acceleration in their revenue growth, consistently reaching new financial milestones in shorter periods. This trend underscores the feverish pace of innovation and adoption within the AI industry, attracting substantial investment and reshaping various sectors.
Mercor, a company specialising in hiring domain experts to train AI models, announced a remarkable surge, crossing $2 billion in gross annualised revenue in June 2026. This significant achievement came just four months after the less-than-three-year-old firm had reached the $1 billion mark, following a $500 million run rate recorded in September 2025.
Model maker Anthropic has also demonstrated extraordinary growth, with its revenue run rate exceeding $47 billion in late May 2026. This figure represents a rapid increase from the $30 billion run rate reported less than two months earlier. The company had previously reported a $9 billion revenue run rate in late 2025, up from $4 billion in July 2025, illustrating a consistent upward trajectory.
Other firms are mirroring this accelerated expansion. Sierra, which develops customer service AI agents, took seven quarters to achieve its first $100 million in annualised recurring revenue (ARR) but then added another $100 million in just two more quarters, as announced in late May 2026. Glean, an enterprise AI startup, crossed $300 million in ARR in May 2026, noting it took nine months to double from $100 million to $200 million, but only six months to grow from $200 million to $300 million.
The impact of AI is not limited to new ventures. Established companies are also leveraging the technology to supercharge their top-line growth. Gusto, a 14-year-old HR tech startup, announced in May 2026 that its revenue accelerated in each of the last five quarters, surpassing $1 billion in trailing 12-month revenue. Similarly, Clio, an 18-year-old legal practice management software provider, saw its ARR reach $500 million recently after embedding AI into its offerings in 2023, having doubled from $200 million in mid-2024 to $400 million by late 2025.