Trajectory raises $45M to make AI model training accessible to nontechnical experts

Trajectory, an 18-person startup founded by three Stanford classmates with experience at Google DeepMind and Apple, raised $45 million in a Series A round at a $300 million valuation led by Sequoia, with participation from Nvidia, Bessemer Venture Partners, and Bain Capital Ventures. The company uses continual learning to let businesses connect an open-source model to their applications, collect feedback on its performance, and retrain it so specialists like lawyers and doctors can improve models themselves. Customers including Harvey, Rogo, Decagon, Mercor, and Nvidia are already using the platform, which is now publicly available.