Trajectory raises $45M Series A to automate AI model post-training

What happened

Trajectory, an 18-person startup founded about a year ago 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 is making its post-training platform publicly available, letting businesses connect open-source models to their applications, collect performance feedback, and retrain models for specialized tasks. Customers include Harvey, Rogo, Decagon, Mercor, and Nvidia.

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The story so far

Trajectory, an 18-person startup founded about a year ago by three Stanford classmates with experience at Google DeepMind and Apple, raised a $45 million Series A at a $300 million valuation, led by Sequoia with participation from Nvidia, Bessemer Venture Partners and Bain Capital Ventures. Alongside the funding, the company made its post-training platform publicly available. The platform lets businesses connect open-source models to their applications, collect performance feedback and retrain models for specialized tasks. Trajectory lists Harvey, Rogo, Decagon, Mercor and Nvidia as customers.