CoCounsel Review, Pricing & Alternatives (2026)

CoCounsel is a professional legal AI assistant made by Thomson Reuters and descended from Casetext's product of the same name. Casetext launched CoCounsel in March 2023, and Thomson Reuters announced a $650 million acquisition of Casetext that year. The product now sits across Thomson Reuters' legal portfolio rather than operating as an independent Casetext service. Thomson Reuters said in February 2026 that one million professionals across 107 countries and territories had chosen CoCounsel across legal, tax, audit, compliance, and related products. Legal users are the clearest audience, including litigators, transactional lawyers, in-house teams, and firms that already buy Westlaw or Practical Law. The acquisition brought Casetext's product expertise into Thomson Reuters, while the current offering adds licensed content and broader distribution.

A typical workflow starts with a natural-language request, an uploaded file, a connected document repository, or a Thomson Reuters research collection. Users can summarize and compare documents, extract information, identify missing provisions, prepare deposition materials, build timelines, draft text, and check contract policies. Knowledge Search can find material in a firm's own repositories, while Browse Library exposes expert-built prompts and skills. Agentic workflows handle multi-step assignments, and Deep Research gathers and synthesizes authority for a more complete answer. Outputs are designed to include citations or links where selected content supports them, but lawyers still need to check quotations, authorities, privilege, confidentiality, and final work product before relying on it. The system assists legal judgment rather than replacing professional review.

The technology is a multi-model system rather than a single branded model. Thomson Reuters says it works with Anthropic Claude, OpenAI GPT, and Google Gemini, alongside proprietary AI engineering, structured data, and licensed professional content. Its security material describes retrieval-augmented generation and controls that constrain answers to vetted content in relevant workflows. In March 2025, Thomson Reuters announced a next-generation CoCounsel with deeper Westlaw, Practical Law, Microsoft 365, and document-management integrations, plus High Volume review. CoCounsel Legal launched in August 2025 with Deep Research, agentic workflows, and broader Thomson Reuters content. The next generation of CoCounsel Legal became generally available in August 2026, with conversational task execution intended to plan, research, analyze, verify citations, and produce work product in one system.

Current official US pricing is configurable for new customers, not a universal per-user flat rate. Thomson Reuters asks buyers to specify attorney count, jurisdiction, and one, two, or three-year commitment. Public starting figures reported by the American Bar Association are $292.50 per user per month for CoCounsel Essentials, $415.35 for Westlaw Advantage with CoCounsel Essentials, and $551.85 for CoCounsel Legal. A later pricing review found different amounts for broader jurisdictions and shorter commitments, including $784 monthly for one attorney on a one-year CoCounsel Legal plan covering all states and federal matters. Two-year commitments receive a reported 12 percent discount, while three-year commitments receive 18 percent. Existing customers and firms above ten attorneys are directed to sales.

CoCounsel's strongest case is a research-heavy practice already invested in Thomson Reuters content. Its citations, document skills, repository connections, Microsoft 365 integrations, and agentic workflows can reduce switching between research and drafting tools, though outputs remain subject to legal review. Law firms should compare it with Harvey, Lexis+ AI, and Legora rather than assume the content advantage settles the decision. Independent 2025 benchmarking placed CoCounsel among the stronger tools across document tasks, while Law360 reported that some early adopters preferred Harvey or Legora for interface and workflow reasons. Privacy terms prohibit using customer prompts and content to train third-party models, with configurable retention, encryption, and zero-retention model APIs. Choose CoCounsel when Westlaw or Practical Law is central and authoritative citations matter most.