Legal Stack Report: 82% of Am Law 100 Firms Require 11.3-Week Security Review for AI Vendor API Access

The Legal Stack AI Workflow Integration Report documented that 82% of Am Law 100 respondents require a formal security review for AI vendor API access — with an average review process of 11.3 weeks — making security clearance the primary deployment bottleneck at large firms, ahead of pricing, product fit, or user adoption. Firms operating under FedRAMP, SOC 2 Type II, or ISO 27001 frameworks apply the most demanding scrutiny, and the review process is becoming institutionalized: dedicated integration middleware layers, standardized security review playbooks, and billing disclosure schemas are emerging as governance infrastructure at the largest firms. For legal tech vendors targeting Am Law, this data quantifies both the friction and the moat: clearing the security review is expensive and slow, but it creates durable switching costs once cleared. Building toward that review process — not just building a good product — is the go-to-market strategy at this tier.