Global content and technology company Thomson Reuters and AI firm Anthropic have announced an expanded partnership, integrating Anthropic’s general-purpose AI assistant Claude directly into its professional legal AI platform, CoCounsel Legal, through a new Model Context Protocol (MCP) integration. This integration enables lawyers to seamlessly access the authoritative legal content and fiduciary-grade workflows underpinning CoCounsel Legal within Claude’s workflow, ensuring a smooth transition from exploration to execution without sacrificing accuracy or professional standards.
It was reported that the next-generation CoCounsel Legal has been rebuilt using Anthropic’s Claude Agent SDK. The new system will feature task planning, tool selection, authoritative content retrieval, and dynamic adaptive capabilities within workflows. Thomson Reuters emphasized that the key differentiator of this integration is the “fiduciary-grade AI” standard—meeting the legal profession’s requirements for precision, accountability, and trust. Currently, CoCounsel Legal can access resources including over 1.9 billion documents from Westlaw and Practical Law, along with 1.4 billion KeyCite validity signals, maintained by more than 2,600 legal experts. Thomson Reuters reported that its AI technology is now used by 1 million professionals across 107 countries.
