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CoCounsel

Grounded legal AI on Westlaw — the litigator's assistant.

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About

CoCounsel (Thomson Reuters) is the legal AI assistant grounded in Westlaw's primary-law database — research, deposition prep, and brief drafting with minimal hallucination risk.

Built on the $650M Casetext acquisition (2023); the gold standard for litigators needing accurate case law. Quote-based pricing.

What it can do

  • Westlaw-grounded research
  • Deposition prep
  • Brief drafting
  • Citation accuracy

Setup

  1. Contact Thomson Reuters sales.
  2. Connect Westlaw access.
  3. Run grounded research.
  4. Draft with citations.

Prerequisites

Thomson Reuters contract.

Use cases

legalresearch

Works with

Generic APIAny agent (.md)

Trust score — 7/10

/10 trustMetrics-checked

Scored 7/10 (metrics tier). The grounded-research leader backed by Thomson Reuters and Westlaw. Docked for proprietary licensing, opaque pricing, and closed metrics (provider-tier adoption estimate). Metrics tier.

How the trust score is built

Full methodology →
Adoption · stars/downloads, log-scaled vs peers
8.0/10
Maintenance · recency, releases, issue load
5.0/10
Openness · license + docs
5.1/10
Manual review · sanity read + red-flag check
8.0/10
  • · provider-tier estimate — thinner evidence (no public adoption metric)
  • · Litigator gold standard — provider-tier estimate
  • · no release date — neutral maintenance score
  • · Westlaw-grounded research leader; Thomson Reuters backed. Closed SaaS, opaque pricing.

Sources

Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.