CoCounsel
Thomson Reuters' AI legal assistant for research, review, and drafting, backed by Westlaw
Last updated
- ⭐ Best for
- litigators
- 💰 Pricing
- From $225/mo
- ⏱ Hours saved/wk
- 7
- 🔥 Why trending
- 7/10 popularity
About CoCounsel
CoCounsel is Thomson Reuters' professional-grade AI assistant for lawyers, originally built by Casetext. It performs legal research, document review, deposition preparation, and contract analysis, with the option to ground answers in Westlaw's authoritative content. It is aimed at litigators and transactional lawyers who want AI inside a trusted research ecosystem.
Key benefits
- ✓AI legal research with verifiable citations
- ✓Document review and summarization at scale
- ✓Deposition preparation and outline generation
- ✓Contract policy compliance checks
- ✓Integration with Westlaw and Practical Law content
- ✓Timeline construction from case documents
+Pros
- ✓Grounding in Westlaw content reduces citation hallucinations
- ✓Broad skill set covering litigation and transactional work
- ✓Available to smaller firms, unlike enterprise-only rivals
- ✓Thomson Reuters backing means long-term product stability
−Cons
- −Expensive per seat compared to general AI tools
- −Best value requires an existing Westlaw subscription
- −Some skills feel deeper than others; quality varies by task
Ready to try CoCounsel?
Start free — paid plans from $225/mo.
CoCounsel vs alternatives
Same category, ranked by ToolMango ROI Score.
| Tool | ROI Score | Pricing | |
|---|---|---|---|
CoCounselthis page Thomson Reuters' AI legal assistant for research, review, and drafting, backed by Westlaw | ★★⯨★★47.3 | $225/mo | View → |
Generative AI workbench for elite law firms: research, drafting, and diligence at scale | ★★★★★59.5 | Free | View → |
AI-powered contract lifecycle management for legal and business teams that hate bottlenecks | ★★⯨★★54.5 | Free | View → |
Legal-grade AI for contract review, negotiation, and compliance built on a legal LLM | ★★⯨★★50.5 | Free | View → |
Machine learning contract analysis for M&A due diligence, now part of Litera | ★★⯨★★48.8 | Free | View → |
Our take on CoCounsel
CoCounsel started life at Casetext as the first serious GPT-4-powered legal assistant, and Thomson Reuters' $650 million acquisition folded it into the Westlaw ecosystem. The result is an AI assistant that can research, review documents, prep depositions, and analyze contracts — with the crucial option of grounding answers in Westlaw's authoritative content rather than the open internet.
What we like
The Westlaw grounding is the killer feature. The legal profession's biggest AI fear is fabricated citations, and CoCounsel's ability to anchor research in verified primary law directly addresses it. The skill breadth is also genuinely useful: deposition outlines, document summarization across large productions, and contract policy checks all work well enough to change how associates spend their week. Unlike Harvey, a ten-lawyer firm can actually buy it, which matters for the 80% of the profession that does not work in BigLaw.
Where it falls short
At roughly $225 per user per month, it is a real budget line, and the value calculus works best if you already pay for Westlaw — standalone buyers get a shallower experience. Skill quality is uneven: research and summarization are polished, while some newer skills feel like demos. And Thomson Reuters' sales-led motion means you will sit through calls before seeing your own price.
Verdict
For litigation-focused firms already inside the Thomson Reuters ecosystem, CoCounsel is the safest and most capable AI purchase available today. Solo lawyers doing mostly transactional work should compare Spellbook first, and large firms should pilot it head-to-head with Harvey. But as an all-around legal AI assistant with real guardrails, CoCounsel sets the standard.
Frequently asked questions
How much does CoCounsel cost?
CoCounsel is typically quoted around $225 per user per month, though pricing varies with Westlaw bundling and firm size. Thomson Reuters sells it through sales reps rather than pure self-serve checkout.
Is CoCounsel better than Harvey AI?
CoCounsel is more accessible — smaller firms can actually buy it — and its Westlaw grounding is a real advantage for research. Harvey is stronger for large-firm workflow customization. For most firms under 100 lawyers, CoCounsel is the practical choice.
Does CoCounsel hallucinate citations?
It can ground research answers in Westlaw's verified content, which sharply reduces fabricated citations compared to generic chatbots. You should still verify every cite before filing.
Who should use CoCounsel?
Litigators who need research, deposition prep, and document review, plus transactional lawyers doing contract analysis. It suits firms of all sizes that already live in the Thomson Reuters ecosystem.
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Thomson Reuters' AI legal assistant for research, review, and drafting, backed by Westlaw
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