What Ai Do Law Firms Actually Use

Clio's 2024 data says 78% of lawyers report using AI — but Bloomberg's survey found only 5% actually use dedicated legal AI agents. That gap tells the whole story: most lawyers are using ChatGPT and Claude for ad-hoc tasks, not purpose-built legal AI tools. The firms that have deployed real legal AI (Harvey, CoCounsel, Spellbook) are overwhelmingly BigLaw and Am Law 200. Everyone else is figuring it out.

The "78% use AI" stat is misleading without context. It includes attorneys who asked ChatGPT a legal question once. The real question is: what tools are firms actually paying for, deploying firm-wide, and integrating into workflows? The answer is a much smaller, more specific list — and it depends almost entirely on firm size and practice area.

The Big Three: Harvey, CoCounsel, and Copilot

The firms that make headlines for AI adoption are using three tools: Harvey is deployed at Allen & Overy, Ashurst, Macfarlanes, and a growing list of Am Law 100 firms. It handles research, drafting, and analysis with a legal-specific AI layer. CoCounsel (Thomson Reuters) is bundled with Westlaw and deployed across thousands of firms that already have Westlaw subscriptions — making it arguably the most widely deployed legal AI by install base. Microsoft Copilot is the silent giant — firms using Microsoft 365 are getting AI features injected into Word, Outlook, and Teams whether they asked for it or not. Most attorneys "using AI" are using Copilot features without even realizing it.

What Small Firms Actually Use: ChatGPT and Claude

The data from small firm surveys tells a different story than BigLaw. Firms with 1-10 attorneys are overwhelmingly using general-purpose AI: ChatGPT Plus ($20/month), Claude Pro ($20/month), and free AI tools. A 2024 ABA survey found that among small firms using AI, 65% use ChatGPT, 28% use Claude, and fewer than 15% use any legal-specific AI tool. The reason is simple: dedicated legal AI tools cost $100-500/month per user, and small firms evaluate every subscription against its ROI. Claude Pro at $20/month handles 80% of what most small firm attorneys need — drafting, research assistance, document analysis — so the business case for expensive tools is harder to make.

The Practice Management AI Layer: Clio, Smokeball, MyCase

The sneakiest AI adoption is happening through practice management platforms. Clio Duo, Smokeball's AI features, and MyCase's automated workflows are inserting AI into daily law firm operations without requiring attorneys to learn new tools. Clio reports that firms using Duo features see 15-20% increases in billable time captured — mostly because the AI assists with time entries and reduces administrative overhead. These aren't flashy tools, but they're where most small and mid-size firms first encounter legal AI. If your firm uses Clio, you're probably already using AI and don't know it.

The 5% Using Agents: What That Actually Means

Bloomberg's finding that only 5% of firms use AI agents refers to autonomous AI systems that handle multi-step tasks without constant human direction — tools like Harvey's agent features or experimental systems that can research, analyze, and draft without step-by-step prompting. This is the bleeding edge, and it's almost exclusively BigLaw. The 5% matters because it's where legal AI is heading: from tools you prompt ("write me a motion") to agents you assign tasks ("analyze this case file and identify the three strongest claims"). The gap between the 5% and the 78% will close over the next 2-3 years as these agent capabilities trickle into cheaper tools.

The Adoption Reality Check

Here's the honest breakdown of law firm AI adoption in 2025: Actually integrated into workflow (15-20% of firms): Using legal-specific AI daily — Harvey, CoCounsel, Spellbook, or similar. Mostly Am Law 200 and large mid-market firms. Using general AI regularly (30-40% of firms): ChatGPT and Claude for drafting, research, and analysis. Mostly ad-hoc, not firm-wide policy. Dabbling (20-30% of firms): Tried AI a few times, use it occasionally, no systematic adoption. Not using AI (15-20% of firms): Either unaware, opposed, or in practice areas where they haven't seen the value yet. The curve is moving fast — the "dabbling" category is shrinking monthly as more attorneys see colleagues saving 5-10 hours per week.

The Bottom Line: Most law firms use ChatGPT or Claude for ad-hoc tasks — only 15-20% have actually integrated legal-specific AI into their workflows, and the gap between "using AI" and "deploying legal AI" is enormous.