Harvey AI vs CoCounsel: Which AI agent is better?
Compare pricing, AI models, integrations, security posture, pros, cons, and buyer fit before choosing the right AI legal agent for your workflow.
Verdict: Harvey AI vs CoCounsel
Pick Harvey AI if you need comprehensive legal work at am law firms. Pick CoCounsel if you need legal research with thomson reuters backing.
CoCounsel wins on price.
Harvey AI integrates with 4 platforms.
Harvey AI
Harvey AI is built specifically for legal professionals using GPT-based models extensively trained on legal documents, case law, statutes, and regulations rather than general internet text, ensuring o...
- Built for legal work with extensive legal training data
- Contract analysis for risks, unusual terms, missing provisions
- Due diligence analyzing thousands of documents
- Legal research across case law, statutes, regulations
- Regulatory compliance analysis
- Legal-specific training ensures appropriate output
- Am Law firm adoption validates enterprise readiness
- Handles full range of legal tasks beyond contracts
- Premium pricing limits accessibility
- Enterprise-only model not suitable for solo practitioners
CoCounsel
CoCounsel is a Thomson Reuters product combining GPT-4 with Thomson Reuters' vast legal content including Westlaw, providing access to comprehensive case law, statutes, regulations, and secondary sour...
- GPT-4 powered with Thomson Reuters legal content
- Legal research across case law, statutes, regulations
- Document review analyzing thousands of documents
- Deposition preparation with suggested questions
- Contract analysis and summarization
- Thomson Reuters backing provides content credibility
- Westlaw integration leverages existing legal research infrastructure
- Backed by Thomson Reuters' legal data
- Usage limits on lower tiers may restrict heavy users
- Less specialized for contracts than dedicated tools
Who should buy this
Harvey AI
- Am Law 100 / Am Law 200 firm scaling associate-level legal research
- In-house enterprise legal team automating contract review and due diligence
- Big 4 advisory firm with regulated client work needing audit trails
- Solo practitioners or small firms (cost prohibitive — Spellbook better fit)
- Buyers needing on-prem (Harvey is cloud-only)
Custom enterprise contracts only — typically ~$1,000+/user/month, billed annually. Reported to start around $300K/year for mid-size firms.
Verified 2026-05-03
CoCounsel
- Law firm or in-house team already using Westlaw / Practical Law (CoCounsel is the AI layer)
- Mid-market and enterprise firm wanting Thomson Reuters' content + AI in one platform
- Litigation team needing deep legal research grounded in case law
- Solo practitioners not on Thomson Reuters platform (Spellbook is more accessible)
- Buyers needing on-prem (cloud-only)
Bundled with Westlaw subscriptions for existing TR customers. Standalone CoCounsel: typically $250-$500/seat/mo enterprise contracts.
Verified 2026-05-03
Capabilities at a glance
| Capability | Harvey AI | CoCounsel |
|---|---|---|
| Legal research + drafting | — | |
| Contract review | — | |
| Due diligence document analysis | — | |
| Translation across legal jurisdictions | — | |
| Trained on legal corpus + firm-specific data | — | |
| On-prem / self-hosted | ||
| Public API | Enterprise | — |
| Legal research with Westlaw integration | — | |
| Contract analysis | — | |
| Document summarization | — | |
| Deposition preparation | — | Enterprise |
| Practical Law integration | — |
Security & compliance
| Standard / control | Harvey AI | CoCounsel |
|---|---|---|
| SOC 2 | Type II | Type II |
| ISO 27001 | ||
| GDPR | ||
| SSO / SAML | ||
| RBAC | ||
| Audit logs | ||
| Trains on customer data | No | No |
What users say
Harvey AI
Allen & Overy, PwC, Macfarlanes, OMERS
Frequently asked questions
Which is cheaper, Harvey AI or CoCounsel?+
Harvey AI's Enterprise plan is $1000+/user/month and CoCounsel's Core plan is $225/user/month. CoCounsel is the cheaper entry point.
What AI models do Harvey AI and CoCounsel use?+
Harvey AI runs on GPT-based models, Legal-specific training data, Proprietary legal AI. CoCounsel runs on GPT-4, Thomson Reuters proprietary models, Westlaw integration.
What is the main difference between Harvey AI and CoCounsel?+
Harvey AI is positioned as best for comprehensive legal work at am law firms, while CoCounsel is positioned as best for legal research with thomson reuters backing. Pick the one whose strength aligns with your primary use case.
Which has better integrations, Harvey AI or CoCounsel?+
Harvey AI integrates with iManage, NetDocuments, Microsoft 365, Legal research databases. CoCounsel integrates with Westlaw, Microsoft Office, Document management systems.
What are the main weaknesses of Harvey AI and CoCounsel?+
Harvey AI's main drawback: premium pricing limits accessibility. CoCounsel's main drawback: usage limits on lower tiers may restrict heavy users.
Are Harvey AI and CoCounsel worth it in 2026?+
Both remain competitive legal options in 2026. Harvey AI stands out for legal-specific training ensures appropriate output. CoCounsel stands out for thomson reuters backing provides content credibility. Choose based on which trade-offs fit your workflow and budget.