What it is
Casetext is the legal-AI assistant that pioneered GPT-4-powered legal research with the launch of CoCounsel in 2023. Acquired by Thomson Reuters in mid-2023, it’s now distributed alongside Thomson Reuters’ broader Westlaw + Practical Law footprint. Used for legal research, document analysis, deposition prep, and contract review.
Why it shows up in Legal Ops stacks
- First-mover legal AI quality. CoCounsel was the first production-grade legal AI assistant with strong citation rigor and professional-grade output. Still ranks among the top of the legal-AI evaluations.
- Eight defined skills. Document review, deposition prep, contract analysis, legal research memo, summarization, draft correspondence, search a database, and contract policy compliance. Each is a structured workflow rather than a free-form chat.
- Thomson Reuters integration. Post-acquisition, CoCounsel is increasingly bundled with Westlaw and Practical Law, which is decisive for firms already on Thomson Reuters infrastructure.
Pricing
- Casetext + CoCounsel — from ~$200/user/month on standalone subscriptions (varies)
- Bundled with Westlaw / Practical Law — Thomson Reuters offers integrated pricing for existing customers
- Solo and small-firm pricing exists; enterprise pricing is custom
Best for
- Firms already on Westlaw and Practical Law looking for AI capabilities without a separate vendor
- Mid-market firms wanting structured AI workflows over free-form prompting
- In-house teams handling regular legal research and document analysis
Watch-outs
- Brand identity is in transition — “Casetext” and “CoCounsel” are both used; some Thomson Reuters materials now refer to it as “Thomson Reuters CoCounsel” or just “CoCounsel”
- Direct API access is limited; integration with internal systems is shallower than Harvey or Spellbook
- For pure transactional drafting, Spellbook is faster and cheaper; for elite-firm-grade enterprise governance, Harvey is preferred