CoCounsel
CoCounsel, developed by Casetext and now part of Thomson Reuters, is an AI legal assistant that automates research, document review, deposition preparation, and contract analysis for legal professionals using GPT-4-based technology.
What is CoCounsel?
CoCounsel is an AI legal assistant created by Casetext, a legal technology company acquired by Thomson Reuters in 2023 for approximately $650 million. Built on OpenAI’s GPT-4 and fine-tuned for legal applications, CoCounsel was among the first widely deployed legal AI tools to be rigorously validated for accuracy in professional practice. It operates as a research and document intelligence assistant, enabling attorneys to delegate time-consuming analytical tasks while maintaining control over the final legal judgment. Thomson Reuters has integrated CoCounsel into its broader Westlaw and legal workflow ecosystem.
Key Features
CoCounsel’s legal research capability allows attorneys to ask natural language questions and receive comprehensive answers synthesized from case law, statutes, and regulatory materials available through Casetext’s database. Responses include citations and source links, enabling attorneys to verify accuracy quickly.
Document review allows users to upload contracts, discovery documents, or regulatory filings and ask targeted questions: “Does this agreement include a non-compete clause?” or “Identify all provisions that trigger indemnification obligations.” CoCounsel processes entire documents and returns structured, clause-level answers.
The deposition preparation module is particularly distinctive—attorneys can upload transcripts, prior depositions, and case materials, then instruct CoCounsel to generate question outlines, identify inconsistencies, or cross-reference exhibits. This compresses preparation time significantly for litigators.
CoCounsel’s contract analysis workflow enables systematic review of agreements for risk flags, missing standard provisions, unusual terms, and obligations requiring calendar tracking. It is particularly useful for in-house teams managing high volumes of vendor or customer agreements.
Who is it For?
CoCounsel is designed for litigation attorneys, corporate counsel, and legal operations professionals at law firms and in-house legal departments of all sizes. Unlike Harvey AI, which targets elite BigLaw, CoCounsel has broader accessibility, particularly through Casetext’s existing subscriber base. Mid-market firms and solo practitioners with Casetext subscriptions can access CoCounsel as part of an integrated legal research workflow.
Pricing & Plans
CoCounsel is available as a paid add-on to Casetext subscriptions and through Thomson Reuters’ legal platform offerings. Pricing is not published publicly and is negotiated based on seat count and use case scope. Thomson Reuters bundles CoCounsel capabilities into Westlaw+ for enterprise customers. Contact sales for current pricing.
Strengths & Limitations
Strengths: Deep integration with established legal research databases; validated accuracy benchmarks; strong deposition preparation tooling; broad applicability across practice areas; Thomson Reuters’ institutional backing.
Limitations: Pricing transparency is limited; full value requires existing Casetext or Westlaw ecosystem access; AI answers still require attorney verification; document upload size limits may affect very large discovery sets.
Disclaimers: Feature offerings and pricing structures are subject to change by software developers. Always check the official website for current terms.