CoCounsel combines licensed content, expert validation by more than 4,500 subject matter experts, data-protection controls, and a multi-model architecture that spans Claude, GPT, Gemini, Anthropic, Google, and TR’s proprietary technologies to deliver trusted outputs.

Outputs are editorially refined and backed by extensive subject-matter expertise and long-standing content, with a system designed to validate legal and tax accuracy across a wide range of scenarios.

Thomson Reuters emphasizes not racing to deploy AI but defining how AI operates in high-stakes work, focusing on accuracy, reliability, jurisdiction-specific rules, and strong data governance.

Investors are cautioned that AI announcements have historically produced modest immediate stock reactions, with prior AI-related news sometimes followed by stock declines, though milestones could influence future revenue and product roadmaps.

CoCounsel has reached a production milestone with one million professionals across 107 countries using the platform, signaling a shift from pilots to production systems in regulated industries such as legal, tax, audit, and compliance.

TR asserts it is shaping how AI operates in high-stakes work rather than racing to deploy, underscoring commitment to accuracy, reliability, and adherence to jurisdiction rules.

Early efforts included AI Assisted Research in Westlaw and Westlaw Deep Research, with ongoing refinement to balance accuracy and helpfulness.

Thomson Reuters is investing over $200 million annually in productized AI, with around $11 billion in capital capacity through 2028 for ongoing AI initiatives and acquisitions.

A next-generation CoCounsel Legal beta is planned, featuring conversational task execution and enhancements for CoCounsel Tax and ONESOURCE+ in 2026, along with a proprietary legal-focused LLM to reduce reliance on external models.

Thomson Reuters acquired CoCounsel and Casetext for $650 million in cash, integrating CoCounsel across Westlaw, Practical Law, Checkpoint, and Microsoft 365.

Product updates continue across research, drafting, analysis, compliance, and workflow automation, with ongoing development of a proprietary LLM tailored to professional and regulated use cases.

CoCounsel functions as an execution layer embedded in professional platforms, enabling end-to-end, multi-step workflows that retrieve authorities, verify citations, apply rules, and deliver outputs suitable for review in legal and financial contexts.