How Thomson Reuters Uses Claude in Amazon Bedrock to Power CoCounsel

Thomson Reuters is one of the world's leading providers of information and technology solutions for legal, tax, and accounting professionals. With a content library spanning over 150 years and a network of more than 3,000 domain experts, the company holds an extraordinary depth of professional knowledge — but the challenge was making that expertise readily accessible to practitioners at the moment they need it most.

The company recognized that AI could serve as a powerful distribution mechanism for its institutional knowledge. However, the stakes in legal and tax work are exceptionally high: inaccurate guidance can expose clients and firms to serious risk. Thomson Reuters needed an AI partner whose capabilities and values aligned with their rigorous quality standards and commitment to responsible, trustworthy outputs.

After benchmarking multiple AI models against both automated and human expert evaluations, Thomson Reuters selected Claude, deployed through Amazon Bedrock. Three factors drove the decision: Anthropic's safety-first philosophy matched Thomson Reuters' own values; Claude consistently cleared their demanding accuracy thresholds; and Amazon Bedrock's enterprise infrastructure offered seamless integration with existing AWS tooling, robust security controls, and the ability to test and deploy new model versions on release day. The team strategically deployed Claude 3 Haiku for high-speed processing tasks and Claude 3.5 Sonnet for deeper, more complex analysis, while also leveraging prompt caching to optimize performance and cost.

The result is CoCounsel, Thomson Reuters' AI platform that synthesizes expert knowledge to help legal and tax professionals deliver more thorough, well-rounded advice to their clients. Built on a comprehensive RAG architecture, CoCounsel processes complex contracts and tax documents, surfaces multiple perspectives on nuanced issues, and helps practitioners move from research to insight far more quickly. Customer feedback has been striking: one law firm partner described the efficiency gains as "staggering," while another estimated the platform could cut task time in half or more.

Looking ahead, Thomson Reuters is expanding its use of Claude into agentic workflows for complex tax processes and exploring computer vision capabilities to help editorial teams curate content more efficiently. The acquisition of Materia AI is expected to accelerate this roadmap, bringing agentic AI capabilities to CoCounsel's Tax, Audit, and Accounting users. Through its ongoing partnership with Anthropic and AWS, Thomson Reuters is working to fundamentally reshape how legal and tax professionals deliver strategic value to their clients.