Best AI tools for lawyers and legal professionals
Spellbook wins for contract drafting inside Microsoft Word. Casetext CoCounsel is best for legal research with citations. Harvey AI serves large law firms with complex document review needs.
Legal AI has moved from experimental to genuinely useful in the past two years. The best tools handle the two most time-consuming parts of legal work: research (finding and synthesizing relevant cases, statutes, and secondary sources) and drafting (producing first drafts of contracts, motions, and correspondence that attorneys then review and refine).
For contract work, Spellbook (built into Microsoft Word) and Harvey AI offer the most seamless drafting experience. For legal research, Casetext CoCounsel (now part of Thomson Reuters/Westlaw) provides grounded, cited research answers. For general legal questions and drafting support, Claude and ChatGPT remain capable generalists — though they lack the specialized legal databases that purpose-built tools provide.
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Legal research with citations, contract review, and deposition prep — backed by Westlaw data
AI legal research and drafting assistant powered by GPT-4, now part of Thomson Reuters, that performs case research, contract review, deposition preparation, and legal document drafting.
Enterprise legal AI for large law firms: document review, due diligence, and drafting
Harvey AI is a generative AI platform built for legal professionals, offering contract analysis, legal research, due diligence, regulatory compliance review, and drafting assistance. Trained on legal data and adopted by major law firms and in-house legal teams, Harvey reduces time spent on routine legal work while maintaining the precision professional practice demands.
Strong general-purpose legal drafting and reasoning for non-specialized tasks
Claude is Anthropic's AI assistant, built for accuracy, nuance, and long-context reasoning. Running on Claude 3.7 Sonnet, it handles text, code, documents, images, and web search with a 200,000-token context window — the largest of any major AI assistant. Claude is the preferred choice for researchers, writers, and developers who prioritize careful, trustworthy output over raw speed.
Useful for general legal research, explaining concepts, and drafting routine correspondence
ChatGPT is OpenAI's flagship AI assistant, built on GPT-4o and used by over 100 million people worldwide. It handles text, code, image generation, voice conversations, web search, and file analysis — making it the most feature-complete general-purpose AI chatbot available. Free users get GPT-4o with daily limits; ChatGPT Plus ($20/month) unlocks higher rate limits and newer reasoning models.
Frequently Asked Questions
Can AI review a contract?
Yes. Spellbook and Casetext CoCounsel can analyze contracts, flag unusual provisions, identify missing clauses, and suggest alternatives. Harvey AI specializes in large law firm contract review. All outputs must be reviewed by a licensed attorney.
What's the best AI for legal research?
Casetext CoCounsel is the most established purpose-built tool, now integrated with Westlaw. It searches case law, statutes, and secondary sources and provides cited answers. Perplexity and ChatGPT can answer general legal questions but lack grounding in authoritative legal databases.
Is AI-generated legal content reliable?
Legal AI tools produce useful first drafts and research starting points, but all output must be reviewed by a qualified attorney. AI can hallucinate legal citations and miss jurisdiction-specific nuances. These tools are meant to accelerate legal work, not replace legal judgment.
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