✓ Allen & Overy✓ PwC Legal✓ Macfarlanes✓ A&O Shearman
Harvey AI is the premier enterprise legal AI platform — built on GPT-4 with extensive legal fine-tuning and used by some of the world's most prestigious law firms and legal service providers. Founded in 2022 and backed by OpenAI, Harvey has quickly become the benchmark for enterprise legal AI, trusted by Am Law 100 firms for high-stakes legal work.
Harvey handles legal research, contract analysis, due diligence, regulatory analysis and document drafting — with an emphasis on accuracy, depth and enterprise-scale compliance. Its models are fine-tuned on vast quantities of legal documents and can be further customised with a firm's own precedents and knowledge base, making outputs increasingly firm-specific over time.
Where Harvey differentiates itself is in the complexity of work it can handle — multi-jurisdictional M&A transactions, complex regulatory analysis across multiple regulatory regimes and large-scale due diligence reviews involving thousands of documents. For the most demanding legal work, Harvey is the most capable AI tool available.
Deep legal research across case law, statutes and regulations — with cited authorities, jurisdictional analysis and nuanced reasoning.
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Contract Analysis
Analyses complex contracts at speed — flagging key provisions, unusual terms, missing clauses and risk factors with legal precision.
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Due Diligence at Scale
Processes thousands of documents for M&A due diligence — extracting, summarising and flagging issues across entire data rooms.
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Multi-Jurisdiction
Handles legal analysis across multiple jurisdictions simultaneously — essential for cross-border transactions and global regulatory work.
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Custom Model Training
Fine-tuned on your firm's own precedents and knowledge — outputs become increasingly firm-specific and aligned with your standards over time.
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Enterprise Security
Enterprise-grade data security, privilege protection and compliance controls — built to meet the requirements of the world's most demanding law firms.
Pros & Cons
What we love
Best-in-class legal research depth and accuracy
Handles the most complex legal work
Trusted by Am Law 100 and Magic Circle firms
Custom model training on firm precedents
Multi-jurisdiction coverage at enterprise scale
Backed by OpenAI — strong AI foundation
Watch out for
Enterprise pricing — not accessible to small firms
Longer procurement and onboarding process
Overkill for routine legal tasks
Requires IT and legal ops investment to deploy
Frequently Asked Questions
Harvey AI does not publicly disclose pricing — it is sold via enterprise contracts negotiated directly with law firms based on firm size, practice areas and usage volume. It is positioned at the premium end of the legal AI market and is generally cost-prohibitive for small and mid-size firms. Large firms should contact Harvey directly for a pricing discussion.
Harvey has publicly announced partnerships with several elite firms including Allen & Overy (now A&O Shearman), Macfarlanes, PwC Legal and others. It is used across Am Law 100 firms and Magic Circle firms in the UK. The firm roster continues to grow as enterprise legal AI adoption accelerates across Big Law.
Harvey is considered among the most accurate legal AI tools available — its legal fine-tuning, enterprise-grade model and firm-specific customisation produce outputs that are closer to the quality expected by elite law firms than general AI tools. However, like all AI, Harvey can make errors and all output should be reviewed by a qualified lawyer before use. Harvey is a tool to augment lawyers, not replace them.
Harvey is the choice for large law firms with complex, high-value work and enterprise procurement capacity. Legora is more accessible for mid-size and smaller firms that want strong legal AI without the enterprise process and price tag. See our full Legora vs Harvey comparison for a detailed breakdown by use case and firm size.