CoCounsel vs OpenEvidence
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose CoCounsel if you want thomson reuters legal ai assistant for research, drafting, and document review (Supervised agent, enterprise); choose OpenEvidence if you want ai clinical decision-support search for verified physicians, grounded in the literature (Assistant, free).
| CoCounsel | OpenEvidence | |
|---|---|---|
| What it is | Thomson Reuters legal AI assistant for research, drafting, and document review | AI clinical decision-support search for verified physicians, grounded in the literature |
| Type | product-with-agents | agent |
| Autonomy | Supervised agent | Assistant |
| Pricing | enterprise | free |
| Best for | enterprise, mid-market, smb | enterprise, consumers |
| Deployment | saas | saas |
| Modalities | text | text |
| Models | model-agnostic, gpt, claude, gemini, proprietary | model-agnostic |
| Protocols | none | none |
| Integrations | Westlaw, Practical Law, Microsoft Word, Microsoft 365, iManage, SharePoint | PubMed, Electronic Health Records |
| Capabilities | 5 documented | 4 documented |
CoCounsel
- +Grounded in authoritative Westlaw and Practical Law content with source-linked, traceable outputs
- +Backed by Thomson Reuters with broad scale (reportedly 1M+ users across 107 countries as of February 2026)
- +Multi-model architecture spanning frontier models (reported: Anthropic, OpenAI, Google) plus proprietary AI for performance control
- -Hallucination and accuracy risk is material in a high-stakes domain; lawyers must validate every output
- -Enterprise, quote-only pricing tied to multi-year terms (no transparent self-serve plan)
OpenEvidence
- +Answers are grounded in peer-reviewed literature with traceable citations
- +Access restricted to verified physicians, narrowing misuse
- +Free for clinicians, supported by a publisher/advertising model
- -Decision support only: clinicians must evaluate outputs; not a diagnostic authority
- -Ad-supported model raises questions about influence on surfaced content
Which should you choose?
CoCounsel is thomson reuters legal ai assistant for research, drafting, and document review, best for enterprise, mid-market, smb. OpenEvidence is ai clinical decision-support search for verified physicians, grounded in the literature, best for enterprise, consumers. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.