Harvey raised $550 million at a $15.5 billion valuation in a financing co-led by Diffusion and Lightspeed Venture Partners, lifting its total funding above $1.55 billion. The round follows a $200 million financing at an $11 billion valuation in March and an $8 billion valuation in December, with the company nearly doubling its value in about nine months. Harvey's customer base has more than tripled since March. The company has introduced Harvey Tenet, its first in-house model, built from the open-weight Kimi K3 model and post-trained on legal data with Fireworks. Harvey is also encouraging customers to adopt and post-train their own open-weight models, reducing reliance on proprietary frontier-model providers. The company previously introduced Harvey LAB, a benchmarking product for legal agents, and has expanded from law firms into corporate legal departments, professional services and financial services.