CoCounsel vs Harvey AI (2026)

CoCounsel

by Thomson Reuters

Harvey AI

by Harvey

Pros

• ✓Grounded in Thomson Reuters' own content: CoCounsel Legal reasons from Westlaw and Practical Law plus a firm's documents, showing its step-by-step reasoning with linked citations to verify.
• ✓Handles volume and drafting: Tabular Analysis runs up to 100 questions across 10,000 documents, Westlaw Brief Builder drafts litigation briefs, and it works inside Word, Outlook, Teams and, through a pilot MCP connector, Claude.
• ✓Published online pricing for smaller firms, with CoCounsel Essentials from $360/mo billed annually, and 116 G2 reviews at 4.7 out of 5, plus a trust profile listing SOC 2 Type II, ISO 27001 and ISO 42001.

Limitations

• –Built around the Thomson Reuters stack: the full CoCounsel Legal plan bundles Westlaw Advantage and Practical Law at $784 per attorney per month on a one-year plan, which firms committed to another research platform may not need.
• –Online pricing stops at 10 attorneys and plans run for one to three years with no month-to-month option, so larger firms and corporate legal departments need a sales conversation.
• –The Claude MCP connector is a pilot that Thomson Reuters may withdraw without notice, its terms bar using Thomson Reuters content with other professional AI tools through an MCP, and no public developer API is published.

Pros

• ✓Harvey Agents execute complex legal work end to end: from contract analysis and due diligence through drafting and research, agents plan the work, split large tasks across parallel agents, and return cited, review-ready output without step-by-step attorney direction. Scheduled Agents can also run recurring work in the background.
• ✓Deep enterprise adoption and backing: Harvey states that more than 200,000 professionals at over 3,500 law firms and in-house legal teams use it, named clients include Dentons, KKR, Bridgewater, PwC, Deutsche Telekom, and Procter and Gamble, and it raised $550M at a $15.5B valuation in September 2026.
• ✓Works where legal teams already work: iManage, NetDocuments, SharePoint, Google Drive and Box connections, Word and Outlook add-ins, LexisNexis research content, and MCP in both directions, with a first-party MCP server for outside assistants and MCP connectors that pull in PitchBook, Datasite and SS&C Intralinks data.

Limitations

• –Enterprise-only pricing with no public price list and no self-serve plan, so every deployment starts with a sales conversation and buyers cannot compare cost before a demo. Spellbook and CoCounsel ($360/mo billed annually) are two alternatives that teams comparing legal AI platforms can evaluate.
• –Harvey publishes no setup or implementation timeline and offers no self-serve trial, so firms cannot switch it on and evaluate it on their own before engaging Harvey sales. Several new capabilities are still in early access, including Intake for in-house contract requests and the litigation fact graph, and firm admins carry the governance work of choosing which connectors and tool actions are permitted.
• –Independent review volume is small relative to adoption: the G2 and Gartner Peer Insights corpora each hold well under fifty reviews, against more than 200,000 professionals using the platform.