New Delhi, April 24 -- A few days ago, the law firm Sullivan & Cromwell apologized to the chief judge of Manhattan's US Bankruptcy Court for a court filing with AI-hallucinated citations.

Andrew Dietderich, co-head of the firm's global restructuring group, wrote the judge that the firm's "comprehensive policies and training requirements governing the use of AI tools" had not been followed.

A secondary review process also failed. A database of similar incidents that had around 90 entries a year ago now has 1,333. Many are from pro se litigants and small-firm practitioners. Now add one of America's leading firms.

It's unlikely this is just about law firms. Their errors are in public court filings. But all professional service firms, even...