Legal AI startup Harvey announced on Wednesday, September 9, 2026, that it has raised $550 million in a new funding round, valuing the company at $15.5 billion.
The round was co-led by Diffusion and Lightspeed Venture Partners. It follows a $200 million raise at an $11 billion valuation announced in March 2026, which itself came just months after an $8 billion valuation from a December 2025 round. With this latest raise, Harvey has now collected more than $1.55 billion in total funding and has nearly doubled its valuation in approximately nine months. According to Pitchbook estimates, Harvey has completed at least eight priced rounds since 2023, five of them since 2025. Given that some earlier rounds were considered extensions, the new round could be classified as a Series F, though Harvey did not formally name it.
The funding announcement comes a couple of weeks after Harvey unveiled its first in-house AI model, Harvey Tenet. The model was built on the open-weight model Kimi K3 and post-trained using legal data, with inference provider Fireworks assisting in the process. Harvey is also encouraging its customers to adopt and post-train their own open-weight models.
The moves suggest Harvey may be positioning the legal industry to reduce its dependence on proprietary AI providers such as OpenAI and Anthropic. By developing its own model and promoting open-weight alternatives, Harvey could offer law firms a path toward greater control over the AI tools they use — though the full implications of that shift will depend on how broadly customers adopt the approach.
Source: TechCrunch