Legal AI · Copilot / assistant
CoCounsel
Thomson Reuters' AI assistant, grounded in Westlaw and Practical Law.
CoCounsel (Thomson Reuters) is a legal assistant for research, review and drafting, sitting on Westlaw, Practical Law and the firm's own matter data. Often used where citation integrity and primary-law grounding are treated as non-negotiable.
Facts above are from the public file. The view is ours. We do not publish a numeric score. Methodology
- Practice
- Legal research, Litigation, Contracts, eDiscovery / investigations
- Jurisdictions
- United States, England & Wales, Canada, Australia
- Autonomy
- Copilot / assistant
- LLM family
- OpenAI (Azure) + Westlaw retrieval
- Evals
- Westlaw accuracy evals, hallucination gating
- Pricing
- Enterprise / seat · Westlaw package
- HQ
- Toronto / London
- Last checked
- 13 Sept 2026
- Last updated
- 13 Sept 2026
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Evidence
Source-backed items on file. Coverage is not a quality score. Not paid placement.
Evidence file
3 independent · 1 vendor (1 historic)
Well documented · weight 3.2Last checked 13 Sept 2026
27 Feb 2025 · VALS AI
VLAIR benchmark: CoCounsel tops document summarisation among evaluated tools
The Vals Legal AI Report evaluated CoCounsel 2.0 on four tasks. It averaged 79.5% and led document summarisation at 77.2%, beating the lawyer baseline on three of four tasks.
Independent reporting · Independent source · Source ↗
5 Aug 2025 · Artificial Lawyer
Thomson Reuters launches CoCounsel Legal with Deep Research
Artificial Lawyer reported CoCounsel Legal as an agentic research system that plans, executes and cites Westlaw and Practical Law, with guided workflows for litigation and transactional work.
Independent reporting · Independent source · Source ↗
15 Sept 2025 · VentureBeat
Deep Research framed as a multi-agent Westlaw researcher, not a chatbot
VentureBeat described Deep Research on CoCounsel as a multi-step agent that spends minutes planning and searching Westlaw’s curated corpus rather than returning instant chat answers.
Independent reporting · Independent source · Source ↗
Date not stated · Thomson Reuters
CoCounsel Legal product page: Westlaw-grounded assistant
Vendor documentation for CoCounsel Legal, positioning the assistant on Westlaw, Practical Law and agentic Deep Research workflows.
Product documentation · Vendor source · Historic · Source ↗