CoCounsel

CoCounsel is Thomson Reuters’ AI legal research assistant, built on the Casetext platform acquired for $650M in 2023. It combines GPT-powered legal AI with Westlaw’s case law database — the first major integration of generative AI into a traditional legal research platform.

Previously known as Casetext, which challenged the legal research market with Parallel Search (AI-powered concept matching) and pricing that undercut Westlaw and LexisNexis. Now bundled with Westlaw as CoCounsel, the standalone pricing advantage is gone, but the AI capabilities have expanded significantly.

What It Does

• Legal research — AI-powered case law search across 50 states and federal courts
• Contract review — Automated clause analysis and risk flagging
• Document review — Concept-based search across document sets (AllSearch)
• Brief drafting — AI-assisted memo and brief generation
• Deposition preparation — Automated question generation from case files

Who It’s For

10,000+ organisations from solo practitioners to Am Law 200 firms. Now positioned as the AI layer on top of Westlaw, targeting both existing Thomson Reuters customers and new adopters looking for AI-assisted research.

What We Haven’t Verified

• Current pricing structure post-acquisition (standalone vs. Westlaw bundle)
• Accuracy benchmarks for AI-generated legal research vs. manual Westlaw search
• Whether the original Casetext standalone product remains available