AfterQuery becomes Y Combinator's fastest-ever unicorn, now valued at $3.2B (techcrunch.com)

AI training-data startup AfterQuery has skyrocketed to a valuation of $3.2 billion, making it Y Combinator's fastest-ever unicorn in just five months since its $30 million Series A round, which valued it at $300 million. This remarkable growth highlights the increasing demand for innovative solutions in the AI and machine learning sector, as AfterQuery capitalizes on the need for high-quality training data. The company, founded by 22- and 23-year-olds who graduated from Y Combinator's Winter 2025 cohort, has quickly garnered a significant customer base, including industry giants like Nvidia, Legora, and Motif Technologies. What sets AfterQuery apart is its approach to model training: rather than merely ensuring accuracy, it focuses on embedding the decision-making and reasoning processes of top professionals—such as doctors and lawyers—into AI models. This method, described as “encoding the patterns, decisions, and reasoning of the world’s best practitioners,” allows AfterQuery to distinguish itself from competitors by providing trained models that mimic expert-level problem-solving. As the company continues to grow and attract attention, its innovative approach could redefine how AI systems are trained and employed across various sectors.