CoCounsel (Thomson Reuters)

CoCounsel is a specialized legal AI assistant from Thomson Reuters designed specifically for legal workflows in law firms and corporate legal departments. The platform combines advanced large language models with Thomson Reuters' verified legal databases to efficiently automate complex legal tasks. Attorneys and legal professionals use the solution to conduct deep research, review contracts, and analyze extensive document sets with high precision. Originally developed by Casetext, the software represents a significant advancement in professional legal technology.

Its functionality is built around tailored skills aligned with core legal tasks such as document review and brief drafting. Users can enter complex queries in natural language or upload proprietary document packages for targeted extraction and analysis. By leveraging direct access to legal literature and case law, the system generates grounded responses backed by exact citations. This approach minimizes the risk of hallucinations and ensures that all generated insights remain fully verifiable.

Data security and the protection of confidential client information are core architectural priorities. Uploaded documents and user queries remain in isolated, encrypted environments and are never used to train public AI models. CoCounsel integrates seamlessly with existing Thomson Reuters solutions such as Westlaw and Practical Law. This creates a unified digital workspace for legal professionals that substantially reduces time spent on repetitive routine tasks.

• AI-Powered Legal Research — CoCounsel searches case law and legal authority using natural language queries and synthesizes the findings. The tool identifies relevant precedents and provides directly verifiable citations for legal drafting.
• Contract Review and Clause Analysis — Users can upload large contract repositories to automatically detect risks, non-standard terms, or specific data points. The AI compares clauses against customizable standard playbooks and summarizes complex provisions.
• Deposition and Trial Preparation — The software analyzes transcripts, witness statements, and trial exhibits to construct structured questioning outlines for depositions. Legal teams save significant time when preparing for complex litigation and hearings.

The platform is designed for practicing attorneys, corporate counsel, law firms, and legal operations teams looking to streamline research and document analysis. It empowers legal professionals to perform complex tasks more efficiently while maintaining high accuracy.

A corporate law firm handling a M&A due diligence review needs to audit hundreds of commercial contracts for liability risks and change-of-control provisions. Instead of manually reading every agreement, the legal team uploads the contract suite to CoCounsel. The AI analyzes the entire dataset in a fraction of the time, highlighting non-conforming clauses and summarizing key obligations. The attorneys receive a structured summary matrix linked directly to specific passages in the source documents. This enables the team to evaluate risks faster and provide prompt, well-supported advice to their client.

• The platform is designed for practicing attorneys, corporate counsel, law firms, and legal operations teams looking to streamline research and document analysis. It empowers legal professionals to perform complex tasks more efficiently while maintaining high accuracy.
• A corporate law firm handling a M&A due diligence review needs to audit hundreds of commercial contracts for liability risks and change-of-control provisions.
• AI-Powered Legal Research: CoCounsel searches case law and legal authority using natural language queries and synthesizes the findings. The tool identifies relevant precedents and provides directly verifiable citations for legal drafting.
• Contract Review and Clause Analysis: Users can upload large contract repositories to automatically detect risks, non-standard terms, or specific data points. The AI compares clauses against customizable standard playbooks and summarizes complex provisions.
• Deposition and Trial Preparation: The software analyzes transcripts, witness statements, and trial exhibits to construct structured questioning outlines for depositions. Legal teams save significant time when preparing for complex litigation and hearings.

CoCounsel should not be used by non-lawyers seeking self-service legal advice without professional oversight, as output requires expert verification. Furthermore, it is not suitable for general non-legal content generation or creative writing.

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