Case Study: Thomson Reuters is Changing the Legal Game with AI


Thomson Reuters, a prominent legal data and media company, has adopted a proactive strategy to integrate generative AI into its offerings. This includes the acquisition of Casetext, a legal AI business, and collaborations with Microsoft for AI drafting solutions. Their portfolio already includes established products like Westlaw and Practical Law. These efforts are part of Thomson Reuters’ broader mission to provide innovative and reliable tools for legal professionals.

Key Takeaways

  • Thomson Reuters has embraced a “build, partner and buy” strategy for rapid AI integration.
  • Acquisitions such as Casetext and partnerships with Microsoft are key to their approach.
  • The introduction of AI-assisted tools like CoCounsel Core and AI-Assisted Research on Westlaw Precision marks a significant shift in legal research methodology.
  • Generative AI is being embedded into various products, offering comprehensive solutions for legal professionals.
  • The company emphasizes responsible and secure development of AI tools, adhering to privacy and reliability standards.


Thomson Reuters’ approach combines internal development with strategic acquisitions and partnerships. By acquiring Casetext, they added advanced AI legal assistance to their capabilities. Collaborating with tech giants like Microsoft enables them to leverage cutting-edge AI technology. Their approach focuses on enhancing legal research and workflow efficiency through AI.


Thomson Reuters’ implementation of AI in their legal services involved a multi-faceted approach. The integration of AI began with the strategic acquisition of Casetext, a pioneering legal AI firm. This acquisition brought in advanced capabilities, particularly in generative AI and legal assistance. Simultaneously, Thomson Reuters engaged in a partnership with Microsoft to develop an AI drafting solution, leveraging both Thomson Reuters’ extensive legal content and Microsoft’s AI expertise. This collaboration aimed to create a tool that seamlessly integrates into widely-used platforms like Microsoft Word, enhancing its accessibility and utility for legal professionals.

In the next phase of implementation, Thomson Reuters focused on embedding AI functionalities into its existing products. Westlaw Precision and Practical Law, already established products in the legal industry, were enhanced with AI-assisted research capabilities. This integration required extensive testing and optimization to ensure that the AI tools were not only accurate but also user-friendly and efficient. The company conducted over 4,000 hours of rigorous testing with the help of more than 1,400 customers, including law firms, corporations, and government agencies. This feedback was crucial in refining the AI tools, ensuring they met the practical and diverse needs of the legal community. The emphasis was on creating a user experience that was intuitive and added real value to the legal research and drafting processes.


The implementation of AI in Thomson Reuters’ products has yielded transformative results. AI-Assisted Research on Westlaw Precision and CoCounsel Core have significantly enhanced the efficiency and accuracy of legal research and document drafting. Legal professionals now benefit from faster, more comprehensive answers to complex legal queries, which has markedly reduced the time and effort traditionally required for legal research. Feedback from users has highlighted the effectiveness of these AI tools in improving the quality of legal work, demonstrating a successful integration of AI into the legal research process. These advancements have not only streamlined workflows but also set new standards in the legal tech industry for AI implementation.

Challenges and Barriers

Integrating AI into complex legal research posed challenges, such as ensuring the accuracy and reliability of AI-generated information. Balancing innovation with the need for data privacy and security was also critical. Overcoming skepticism in the legal community about the reliability of AI-assisted research was another hurdle.

Future Outlook

Thomson Reuters plans to expand AI capabilities to more areas of legal research. The focus will be on enhancing user experience, expanding market reach, and continually improving the accuracy and reliability of AI tools. The company is positioned to remain a leader in the legal tech industry, driving innovation and efficiency through AI.

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