Thomson Reuters Expands Partnership with Anthropic: Claude Now Integrated with CoCounsel Legal

Toronto, May 12, 2026 – Global content and technology company Thomson Reuters today announced an expanded partnership with Anthropic, launching a new Model Context Protocol (MCP) integration. The integration connects Anthropic’s AI assistant Claude directly to Thomson Reuters’ CoCounsel Legal system, enabling legal professionals to seamlessly access CoCounsel Legal’s authoritative content and fiduciary-grade professional workflows within Claude’s workstream.

David Wong, Chief Product Officer at Thomson Reuters, said: “Thomson Reuters is building CoCounsel Legal as the core fiduciary-grade system for legal work — connecting the tools lawyers use every day, built to the highest standards legal professionals require. Today’s integration is a clear example of these expanding connections, and we expect the next generation of CoCounsel Legal to reach general availability this summer.” Notably, the next-generation CoCounsel Legal will be rebuilt on Anthropic’s Claude Agent SDK, enabling it to autonomously plan, select tools, retrieve authoritative content, and dynamically adjust within workflows — helping legal practitioners transition smoothly from exploration to execution without compromising professional standards.

This partnership deeply integrates Claude’s advanced AI capabilities with Thomson Reuters’ attorney-reviewed authoritative legal content from Westlaw, Practical Law, and other sources. Lawyers using Claude can directly invoke CoCounsel Legal’s research, analysis, and drafting functions, significantly improving efficiency while maintaining high accuracy and accountability. As MCP integration gains traction in the legal market, Thomson Reuters is redefining the professional standard for legal technology with fiduciary-grade AI standards.

Insight: This collaboration marks a new phase of “tools as a service” in legal AI — connecting general-purpose AI assistants with domain-specific expert knowledge bases and compliance workflows. It promises to become a key infrastructure for law firms and corporate legal departments seeking to boost productivity.