Open models do not become trustworthy because their weights can be downloaded. Their value is that a firm can inspect more of the system, evaluate it against its own work, adapt it to its own language, run it inside a controlled environment, and move it when infrastructure or strategy changes.
For law firms, the intelligence being encoded is precedent selection, drafting judgment, negotiation posture, matter history, client context, and the methods by which lawyers turn facts into advice. The question is not simply which model scores highest today. It is which architecture lets the firm govern what the system learns and retain the capability it creates.