Thomson Reuters' CoCounsel hits one million users

Executive Summary

• Thomson Reuters reports that its professional-grade AI platform, CoCounsel, has reached a milestone of one million active professionals across 107 countries and territories.
• The adoption highlights a shift in regulated industries (legal, tax, audit, compliance) from experimenting with general-purpose AI to embedding specialized, citation-backed AI into daily workflows.
• The company emphasizes CoCounsel's design for high-stakes environments, featuring licensed authoritative content, expert validation, and strict data privacy protections where customer data is not used to train third-party models.

Key Details

• Adoption Metrics: One million professionals are using CoCounsel across 107 countries and territories.
• Target Industries: Legal, risk, compliance, tax, accounting, audit, and global trade professionals.
• Product Portfolio: CoCounsel powers capabilities across CoCounsel Legal, CoCounsel Tax and Audit, and Onesource+.
• Technical Architecture:
  • Integrates licensed content refined over 175 years.
  • Incorporates expert-developed validation logic.
  • Utilizes a multimodel architecture including Anthropic's Claude, OpenAI's GPT, and Google's Gemini, alongside proprietary AI technology.
  • More than 4,500 Thomson Reuters subject matter experts contribute to validation and refinement.
• Data Privacy: Customer data remains protected and is not repurposed to train third-party models or generate outputs for other users.
• Future Roadmap:
  • Next-generation CoCounsel Legal is entering beta soon, featuring conversational task execution.
  • Capabilities include building plans, retrieving authority from Westlaw and Practical Law, searching user documents, verifying citations, and delivering structured work products.
  • Additional next-generation capabilities for CoCounsel Tax and Onesource+ are planned for later in 2026.

Notable Quotes

• "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 chief executive officer, Thomson Reuters.
• "When the work matters, the AI must be professional grade. Professionals need systems that can complete sophisticated work within the standards they are accountable to every day. That's the gap between CoCounsel and everything else," added David Wong, chief product officer, Thomson Reuters.