Document & contract processing
Legal drafting and research assistance
Can AI help lawyers draft and review documents faster?
Legal drafting, review and research eat expensive senior time, and the work is too high-stakes to hand to a black box. One international law firm rolled out an AI assistant that helps lawyers draft, summarise and research in natural language over the firm's own material — with a strict 'lawyer in the loop' and firm and client data firewalled — reporting faster contract review on well-bounded tasks. The transferable capability is AI-assisted drafting and research on documents, scoped to high-effort, low-risk work where a professional validates every output — never an autonomous substitute for legal judgement.
The problem
Lawyers spend heavily on first drafts, document review and research — high-effort work that’s expensive and slow.
The AI approach
Harvey — a GPT-4-based model fine-tuned on legal data — lets lawyers draft, summarise and research via natural language, fine-tuned further on the firm’s own material, with a strict “lawyer in the loop” and no training on customer data.
Evidence it works
A&O deployed Harvey to 3,500+ lawyers across 43 offices (trialled from Nov 2022; ~40,000 queries in the trial). Reported usage reached ~80% of the firm monthly; later reporting cites ~2–3 hours saved per lawyer per week and ~30% faster contract review.
What “good” looks like
Faster first drafts and research with rigorous human review; measurable time savings on well-bounded tasks; confidentiality preserved.
Feasibility & cost shape
Vendor-led deployment is feasible quickly; the real work is use-case selection, review workflows, and security/confidentiality design.
A model of “minimum viable trust” — target high-effort, low-risk tasks, insist on human review, and prove value before widening. That sequencing is exactly right.
Based on publicly reported information about the Allen & Overy (now A&O Shearman), with Harvey work.
This is an industry example included for illustration. It is not a Leia Intelligence project, and no client of ours is implied. Figures are as publicly reported by the original parties.
Sources: A&O Shearman (press release & insights) · LawSites/LawNext · Legal IT Insider · Wikipedia (Harvey) summarising firm statements