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Thomson Reuters CoCounsel (formerly Casetext CoCounsel)

AI search assistant that delivers AI-driven responses and insights instantly.

Our take: Originally Casetext CoCounsel, this tool was acquired by Thomson Reuters for $650M in 2023 and fully rebranded as CoCounsel Legal in 2025 — the standalone Casetext product was retired in March 2025.

Best forLegal Professionals
ReviewedPricing: Paid
7.5 out of 105 criteria · see breakdown
Try ThomsonFrom ~$104/user/mo (annual; custom quote)
CoCounsel is now a Thomson Reuters product

Thomson Reuters completed its acquisition of Casetext on 17 August 2023, and CoCounsel is now sold on the Thomson Reuters website. casetext.com/cocounsel returns a 410 Gone error (checked 3 October 2026).

Checked October 3, 2026
The bottom line

The most capable AI legal assistant on the market, built for firms that already live in the Thomson Reuters ecosystem — but enterprise pricing puts it out of reach for solo or budget-conscious practitioners.

Our score

Reviewed by the Conversion Gems editorial team. Hover a facet to focus it; click to pin.Tap a facet to focus it.

Community ratings

Shown for context only. Our score is independent.

G2
4.8 out of 5
70+ reviews
Capterra
4.7 out of 5
130+ reviews

4.7 / 5 aggregate · across 2 sources

Third-party ratings shown verbatim; aggregate weighted by review volume.

What it is, and why we rate it

One line each. Open a row for detail.

What it really isCoCounsel (Thomson Reuters) — AI legal assistant for research, drafting, and document review.
Our takeOriginally Casetext CoCounsel, this tool was acquired by Thomson Reuters for $650M in 2023 and fully rebranded as CoCounsel Legal in 2025 — the standalone Casetext product was retired in March 2025.
Current plans run ~$104–$639+/user/month on annual terms, with most tiers requiring a sales quote. This is purpose-built legal AI deeply integrated with Westlaw, Practical Law, and Microsoft 365.
Why we rate itCoCounsel is the benchmark legal AI: it was the first GPT-4-powered legal assistant (March 2023) and has since added agentic multi-step research, batch document analysis, and jurisdiction-aware contract drafting.
The Westlaw citation verification layer meaningfully reduces hallucination risk compared to generic LLM legal tools.
The catchPremium pricing ($600+/user/mo for the most useful bundle) makes it inaccessible for solo practitioners and small firms.
No free trial — only a demo. Locked into Thomson Reuters' pricing and renewal cycle; switching costs are high once workflows embed Westlaw and Practical Law.

Best / not good for

Best for
  • AmLaw 200 and mid-market law firms with existing TR subscriptions
  • In-house legal teams needing fast, citable research and contract review
  • Litigators who rely on Westlaw for case law and KeyCite verification
Not good for
  • Solo attorneys or small firms on tight budgets
  • Non-legal professionals or general productivity use cases
  • Teams seeking a month-to-month or no-commitment AI subscription
Trade-offs

Friction report

Trade-offs to know before signing up.

  1. Time to value
    Moderate: demo and sales call required before access; onboarding to agentic workflows and DMS integrations adds setup time, though core research tasks are fast once live.
  2. Scale breakpoint
    Per-seat costs compound sharply at larger firms; Westlaw jurisdiction pricing also scales by circuit coverage selected, making cost unpredictable for multi-region practices.
  3. Walled garden
    High: deep integration with Thomson Reuters' Westlaw and Practical Law creates strong lock-in; workflows, research history, and drafting templates stay within the TR ecosystem.
Still a fit?
If none of these block you, try it on the official site.
Try Thomson

Frequently Asked Questions

How does Casetext Cocounsel assist with AI-powered legal research?

Casetext Cocounsel assists with AI-powered legal research by analyzing legal documents, generating case summaries, and providing relevant references.

How can Casetext Cocounsel assist with AI legal research?

Casetext Cocounsel assists with AI legal research by analyzing legal documents, suggesting citations, and summarizing content.

How can Casetext Cocounsel assist with AI legal research?

Casetext Cocounsel assists with AI legal research by providing case analysis, document summarization, and search capabilities.

How does Casetext Cocounsel assist in AI legal research?

Casetext Cocounsel assists in AI legal research by providing case analysis, document summarization, and legal insights.

How is Casetext Cocounsel used for AI-assisted legal research?

Casetext Cocounsel is used for AI-assisted legal research by analyzing cases, providing references, and drafting legal insights.

Alternatives

  • Step up

    Thomson Reuters CoCounsel Legal (full tier) for complete Westlaw + Practical Law access with priority support.

  • Lighter alternative

    Harvey AI or Lexis+ AI for firms wanting legal AI without full Thomson Reuters subscription lock-in.

Showing 1–2 of 2

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Tags

#AIProductivity#KnowledgeManagement#NoteTaking

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