Thomson Reuters says one million professionals across 107 countries are now using its AI assistant, CoCounsel — a milestone the company argues signals that artificial intelligence has moved from experimentation into production across regulated industries.
The figure spans legal, tax, audit, compliance, risk, and global trade professionals. While the company did not provide a breakdown of active users versus licensed seats, the announcement suggests enterprise-scale deployment inside organizations where accuracy, sourcing, and data governance are essential.
AI adoption across professional services has accelerated rapidly over the past 18 months. But unlike general-purpose chatbots, systems used in legal and financial workflows must withstand scrutiny in courtrooms, audits, and regulatory proceedings. That requires retrieving authoritative sources, validating citations, and applying jurisdiction-specific rules — not simply generating plausible text.
Thomson Reuters positions CoCounsel as “professional-grade AI,” embedded directly within its existing platforms rather than offered as a standalone tool. The system powers capabilities across CoCounsel Legal, CoCounsel Tax and Audit, and ONESOURCE+, integrating into research, drafting, and compliance environments professionals already use.
According to the company, CoCounsel’s outputs are grounded in licensed legal and tax content refined over more than 175 years, with validation logic shaped by more than 4,500 subject matter experts. Thomson Reuters says customer data is not repurposed to train third-party models.
“Professionals are not deciding whether to use AI anymore. They are deciding which AI they trust when their reputation and their clients’ data are on the line,” said Steve Hasker, President and CEO of Thomson Reuters.
Rather than positioning CoCounsel as a conversational chatbot alone, Thomson Reuters describes it as an execution layer embedded within professional workflows.
In legal settings, that means retrieving authority from platforms such as Westlaw and Practical Law, analyzing user documents and precedent, verifying that citations remain in good law, and generating structured, citation-backed work product within a single system.
The next generation of CoCounsel Legal, entering beta soon, is designed around conversational task execution. Lawyers will be able to describe an objective — much as they would brief a colleague — and the system will build a plan, gather authority, analyze materials, and produce a structured draft.
Additional next-generation capabilities for tax and ONESOURCE+ users are planned for 2026.
As AI becomes embedded within professional systems, the defining question is shifting from how quickly it can generate text to whether it can support work that carries legal or financial consequences.
With one million professionals now licensed to use CoCounsel, Thomson Reuters appears to have reached meaningful scale in the race to operationalize AI inside high-stakes work.