How CMS Uses Harvey to Scale AI to 7,200 Lawyers Globally

CMS is one of the world's largest international law firms, with 7,200 lawyers and 10,000+ professionals across more than 50 countries. As generative AI matured, CMS prioritized finding an enterprise-grade partner that could operate at global scale while meeting its strict data governance and client confidentiality requirements.

The challenge was significant: deploying AI across a highly distributed global workforce spanning dozens of jurisdictions and practice groups, where any misstep could carry reputational and legal risk. The firm needed a solution that was not only capable but secure and governable from day one.

CMS selected Harvey and began with a structured 12-month pilot of 300 lawyers, using Harvey's core capabilities — Assistant for document analysis, drafting, and Q&A; Vault for secure bulk document analysis; Knowledge for legal and regulatory research; and Workflow Agents for automating repeatable legal tasks. Strong results from the pilot validated the approach.

By summer 2025, 3,000+ lawyers were actively using Harvey daily, and the firm committed to a full firmwide rollout reaching all 7,200 lawyers — described as one of the world's largest GenAI deployments in the legal sector. Adoption in the initial phase hit 95%. Lawyers are now reviewing larger document sets faster and taking on types of work that were previously impractical. The firm's leadership views AI as table stakes for remaining competitive in global legal services.