AI Hallucinations in Filing by a Top Law Firm

Key Takeaways

• Sullivan & Cromwell’s bankruptcy motion contained fabricated citations from AI.
• Firm’s AI policy required training, yet safeguards were ignored.
• Rival Boies Schiller Flexner identified the errors, prompting apology.
• Incident fuels debate on AI governance and potential regulation in legal practice.

Pulse Analysis

Generative AI tools promise efficiency for law firms, but the recent Sullivan & Cromwell filing illustrates a stark downside: hallucinated citations that can mislead courts and erode client confidence. As firms integrate large language models for research and drafting, the technology can fabricate non‑existent authorities or misquote precedents, creating a hidden risk that traditional review processes may miss. The bankruptcy motion filed on April 9, 2026, contained several such errors, prompting the firm to issue a detailed apology and acknowledge lapses in its own AI governance framework.

Sullivan & Cromwell’s internal policy mandates two mandatory training modules for any lawyer accessing AI, coupled with a strict verification requirement—"trust nothing and verify everything." Yet the senior partner overseeing the restructuring practice admitted that these safeguards were bypassed, leading to inaccurate citations and other clerical mistakes. The firm’s swift remedial actions, including a full re‑review of all related filings, signal an awareness that even a single AI slip can trigger reputational damage and procedural setbacks. The incident also drew attention from Boies Schiller Flexner, a leading litigation firm that flagged the errors, underscoring how competitive pressures can amplify scrutiny of AI use.

The broader implication for the legal industry is a growing call for standardized AI oversight and possible regulatory guidance. Law firms may need to adopt layered verification, independent audit trails, and continuous monitoring to mitigate hallucination risks. As courts become more vigilant about AI‑generated content, firms that proactively enhance their governance will likely preserve client trust and avoid costly sanctions, positioning themselves as leaders in the responsible deployment of legal technology.