The Legal AI Index
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US firm

Sullivan & Cromwell

AI advisory powerhouse. AIDA discovery tool plus a new Digital Infrastructure Practice Group.

Proprietary tools and programmes
  • AIDA (AI Discovery Assistant)

    Built with LAER AI (Cornell/Carnegie Mellon post-doctoral researchers).

  • Digital Infrastructure Practice Group

    New practice group launched Dec 2025. Has led transactions valued over $1 trillion in AI infrastructure.

What is happening
  • ·Major AI deal flow: advised OpenAI (6GW AMD partnership), xAI ($20bn equity financing, Jan 2026), SoftBank ($4bn DigitalBridge acquisition).
  • ·Advises OpenAI on the safe and ethical deployment of AI - elite AI client base.
  • ·April 2026 hallucination incident: an emergency motion in a bankruptcy case contained AI-generated hallucinations, drawing industry attention to the limits of risk-proof AI use even at the most sophisticated firms.
Sources