Harvey's 25,000 Custom Agents and 15–75% Due Diligence Time Savings — Enterprise AI Is Producing Documented ROI

Harvey reported 25,000+ custom agents in production this week, with M&A due diligence workflows delivering 15–20% time savings on structured data rooms and up to 75% on unstructured document sets. GSK Stockmann and Bruchou & Funes de Rioja are running live M&A transactions on Harvey; Microsoft's 2,000-person in-house CELA legal department has deployed Harvey across legal and compliance operations; and Heuking expanded Harvey to all professional groups firmwide on August 5. For managing partners and IT directors at mid-sized firms evaluating enterprise legal AI, these deployment numbers matter because they reframe the ROI conversation: the question is no longer whether legal AI produces measurable efficiency gains (it demonstrably does) but whether mid-sized firms can deploy it at the workflow depth that produces those gains, which requires practice-group-specific implementation, custom agent builds, and active adoption management rather than a platform subscription alone.