Casetext (CoCounsel)

CoCounsel is an AI-powered professional assistant developed by Thomson Reuters, designed to support legal, tax, accounting, and audit professionals. Engineered by over 1,000 AI and machine-learning experts, it integrates with industry-standard platforms like Westlaw, Practical Law, Checkpoint, and Microsoft 365 to provide domain-specific insights.

The platform distinguishes itself through a "trustworthy AI" approach, utilizing agentic and generative AI models that are grounded in verified, authoritative content to limit inaccuracies and algorithmic bias.

A core focus is data security and privacy: CoCounsel is designed such that user content and prompts are not used to train underlying large-language models (LLMs) from third-party partners like OpenAI or Google, and it employs encryption protocols for data in transit and at rest.

Users can manage content retention policies at the organizational level, and the platform implements "guardrails" to restrict responses to clearly defined sets of verified information.

Designed for professionals who require high-stakes reliability, the tool acts as a specialized assistant that manages massive datasets and complex workflows, saving time on research, compliance, and drafting while maintaining strict control over data governance.