Big Four AI: Automation, Hallucinations and Risk
Deloitte, PwC, EY and KPMG are investing heavily in AI, selling AI-enabled services to clients, and presenting themselves as trusted advisers on automation, governance and digital transformation. But the rise of generative AI also raises difficult questions about quality control, professional judgment, accountability and client reliance.
This page brings together Big4News coverage of AI across the Big Four firms, including hallucinated reports, unreliable citations, automation claims, audit and consulting risks, governance failures, and the wider implications for professional services.
The Hallucination Trap
On June 12, GPTZero published an article revealing that one of KPMG International’s flagship reports, “Total Experience: Redefining Excellence in the Age of Agentic AI” (released in October 2025) included several case studies about reputable firms such as UBS, Swiss Federal Railways, and Transport for London that were figments of the AI’s imagination.
Big Four AI Arms Race
Frontier AI like Claude is rapidly moving from experimental pilots to core business infrastructure, and the firms that can best weave it together with deep industry knowledge, regulatory expertise, and change-management muscle are positioning themselves for what looks like a massive wave of consulting and technology work ahead — the kind that will keep the next generation of Big Four partners very busy, and well compensated, indeed.