Legal AI startup Harvey has raised $550 million in fresh funding at a $15.5 billion valuation, extending a rapid run of fundraising as the company expands its artificial intelligence tools for law firms and corporate legal teams.
The latest round was co-led by Diffusion and Lightspeed Venture Partners. New investors Sapphire Ventures and Whale Rock also participated, alongside existing backers including Sequoia, Kleiner Perkins, Andreessen Horowitz, Coatue, GIC, Goldman Sachs Alternatives, Conviction, Elad Gil, Evantic, Verified Capital and WNDR.
The financing comes less than six months after Harvey raised $200 million at an $11 billion valuation in March. In December 2025, the company had been valued at $8 billion following a $160 million investment led by Andreessen Horowitz. The latest round takes Harvey's total funding raised to more than $1.5 billion.
Harvey develops AI software for legal and professional services teams, with its platform used for tasks including legal research, contract analysis, due diligence and other document-intensive workflows. The company says its technology is currently used by 80% of Am Law 100 firms and legal teams at five of the Fortune 10 companies.
The new capital follows Harvey's introduction of Tenet, its first post-trained open-weight legal model, alongside Harvey LAB, a benchmark designed to evaluate AI models on legal tasks.
Tenet was developed using Kimi K3, an open-weight foundation model, and further trained using legal data. Harvey is increasingly investing in its own model development while also allowing customers to work with and customise open-weight models for organisation-specific requirements.
The approach could reduce the company's dependence on proprietary models from major AI developers as it builds technology specifically for legal workflows.
Harvey said the latest funding will support its efforts to help law firms, in-house legal departments and professional services organisations build and manage their own AI capabilities. The company also plans to expand its team and increase investment in model training and product development.
Founded by Winston Weinberg and Gabe Pereyra, Harvey has emerged as one of the most highly valued startups focused on applying generative AI to professional services.
Its valuation has risen from $8 billion in December 2025 to $15.5 billion in September 2026, reflecting continued investor interest in specialised AI platforms targeting industries with complex, high-value workflows.
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