"The Big Four have invested heavily in automation and AI for years, but 2025 was the year those tools went mainstream. Employees across audit, tax, and consulting now routinely use chatbots and agentic AI systems, and clients are increasingly given access as well. Deloitte rolled out Zora AI, an agentic platform built with Nvidia, which offers clients "intelligent digital workers" capable of autonomously completing tasks."
"EY launched its own agentic platform, EY.ai, granting 80,000 tax staff access to 150 AI agents for tasks such as data collection, document review, and tax compliance. EY told Business Insider it has advanced 1,000 AI agents into development or production in 2025, with plans to scale to 100,000 by 2028, and is investing more than $1 billion annually in AI platforms and products."
"PwC introduced its agentic platform, agent OS, in March and has since deployed 25,000 intelligent agents across client operations. A PwC spokesperson told Business Insider that partnerships with companies like Salesforce, CrewAI, and AWS were central to how PWC drove AI-led growth in 2025. KPMG followed in June with KPMG Workbench, an agentic AI platform developed with Microsoft that connects 50 AI agents and chatbots,"
The Big Four must implement AI internally while helping clients adopt the same technologies, effectively acting as client zero for corporate AI adaptation. 2025 marked mainstream adoption of agentic AI and chatbots across audit, tax, and consulting workflows. Deloitte launched Zora AI with Nvidia, expanded generative features in Omnia, and secured a deal to deploy Claude across 470,000 employees. EY deployed EY.ai to 80,000 tax staff, developed 1,000 agents with plans to scale to 100,000 and is investing over $1 billion annually. PwC rolled out agent OS with 25,000 deployed agents and partnerships with Salesforce, CrewAI, and AWS. KPMG introduced KPMG Workbench with Microsoft connecting 50 agents and chatbots.
Read at Business Insider
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