The Vertical AI Era in Legal Tech Has Arrived: Why Horizontal AI Tools Are Quietly Hitting the Law Firm Wall in 2026 — And What the Next 18 Months Will Look Like

More than 90% of lawyers now use at least one AI tool — but horizontal AI assistants (general-purpose chatbots, generic document drafters) are hitting a quiet wall inside law firms in 2026. The wins are coming from vertical AI: tools that understand a specific practice workflow end-to-end. Here's the structural reason horizontal tools cap out, and why the next 18 months belong to platforms with vertical AI embedded in the operating model.