CoCounsel
AI legal assistant from Thomson Reuters
Overview
CoCounsel (formerly Casetext) is Thomson Reuters' AI legal assistant — research, contract analysis, deposition prep, document review. Acquired by Thomson Reuters in 2023 and integrated into the Westlaw/Practical Law product line.
Use cases
What you can produce with CoCounsel
- Ask a natural-language legal research question and get a memo-style answer with citations to verified Westlaw cases and statutes rather than open-web sources.
- Upload a stack of discovery documents and have CoCounsel review them for specified issues, flagging relevant passages with pinpoint references.
- Generate a deposition outline for a witness by feeding in the complaint and key documents, then refine the question list by topic.
- Summarise a lengthy contract and extract specific clauses — indemnification, termination, change-of-control — into a structured table for comparison.
- Build a chronology of events from a messy set of emails, memos and filings, with each entry linked back to its source document.
- Check a draft brief's cited cases for negative treatment using integrated KeyCite signals before filing.
- Ask follow-up questions in the same session so the assistant refines its research against your jurisdiction and fact pattern.
ASEAN Perspective
CoCounsel in Southeast Asia
ASEAN-region availability and pricing notes coming soon. Drop the editorial team a note via /contact/ if you can supply local context (Singapore/Malaysia/Indonesia/Thailand/Vietnam).
CoCounsel, originally Casetext and now Thomson Reuters' flagship AI legal assistant, is a category leader for AI-assisted legal research, document review, deposition prep and drafting, grounded in Westlaw authority and Practical Law guidance and rebuilt on Anthropic's Claude Agent SDK. With 1M+ users across 100+ countries, it is one of the most credible, source-grounded legal AIs available.
It suits law firms, in-house counsel and legal professionals who need defensible, citation-backed output, not consumers or those wanting a cheap general chatbot. Honest caveats: pricing is enterprise/professional and not transparent, it is expensive, and its grounding is strongest in US (and select common-law) law, limiting direct fit for ASEAN civil-law jurisdictions. Note the casetext.com URL now redirects into the Thomson Reuters product. No public self-serve API; integration is enterprise. ASEAN coverage exists globally but localisation for SEA legal systems is limited.
What people say
CoCounsel began life as Casetext's GPT-4-powered legal assistant and was acquired by Thomson Reuters in 2023. It has since been folded into the Westlaw and Practical Law ecosystem and repackaged as CoCounsel Legal, so what you buy today is less a standalone startup product and more the AI layer of the Thomson Reuters research stack. The original casetext.com product has effectively been absorbed.
User sentiment is genuinely positive on the core work. CoCounsel Legal holds 4.5/5 on G2 across roughly 282 reviews, and lawyers consistently praise the same things: research answers grounded in verified Westlaw and Practical Law content rather than the open web, big time savings on document review, deposition preparation and summarisation, and an interface that non-technical attorneys pick up quickly. Independent benchmarking has been kind too — it scored 79.5% on the VLAIR legal AI benchmark in early 2025, beating lawyer baselines on document Q&A, extraction and chronology tasks. Reviewers report few hallucination incidents, which they attribute to the closed, citable content base.
The complaints cluster around cost and configurability. Pricing starts around USD 225 per user per month, billed annually, and reviewers note the real cost climbs once Westlaw dependencies are factored in — the American Bar Association's GPSolo review framed the small-firm question as "smart assistant or costly add-on" for a reason. Appellate lawyers complain about limited customisation and missing links to appellate briefs, others want jurisdiction-specific defaults and fewer clicks for routine tasks, and some content gaps (such as pattern jury instructions) still surface.
CoCounsel fits mid-size and large firms already committed to the Thomson Reuters ecosystem, and litigation teams drowning in document review. Solo practitioners and small firms should price the full stack honestly before committing, and firms outside Westlaw jurisdictions will feel the content advantage far less.
Summary of public user & expert reviews, compiled by RECATOOLS.
About this listing
This entry was compiled from publicly available data including CoCounsel's official website, press releases, documentation, and reputable third-party publications. RECATOOLS is not affiliated with CoCounsel unless explicitly stated.
Third-party AI tools update their pricing, features, availability, and policies frequently. Information here may be outdated by the time you read this — we make reasonable efforts to keep listings current, but cannot guarantee absolute accuracy.
For the latest details, please refer to CoCounsel directly →
Spotted something out of date? Suggest an update →
More in Business & Finance
