In-House AI Adoption at 87% Outpaces Law Firms — GCs Running AI Against Invoice Histories to Decide What to Insource

FTI Consulting and Relativity's 2026 General Counsel Report (224 GC/CLO respondents) found 87% of legal departments now use generative AI, nearly double last year's 44%. Thomson Reuters' State of the UK Legal Market 2026 found corporate legal teams outpace law firms in org-wide AI adoption (53% vs. 35%). A separate LinkedIn commentary (Ted Theodoropoulos, July 31) drew on multiple surveys: 58% of GCs say their law firms rarely or never bring up AI with them; only 4% have seen any actual benefit from their firms' use of AI; 42% of GCs say AI cost savings should be split equally between firm and client; and some GCs are committing to cut external legal spend by 20–40% over the next three years. Critically: "They're already running AI across years of your invoice narratives to decide what gets insourced or automated." For mid-sized firm managing partners and BD directors: the invoice narrative analysis data point is the most operationally significant item in this week's client intelligence for competitive positioning purposes. GCs are using AI on years of historical billing data to identify which matter categories have high volume, low complexity, and predictable structure — and those are the first insourcing candidates. Mid-sized firms need to understand which of their matter categories are insourcing risk and build a differentiated value narrative around the work that genuinely requires partner-level judgment.