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Contrary to expectations, IBM's mainframe business is growing because moving its critical workloads (like banking transactions) to the cloud would be three times more expensive. Mainframes provide unparalleled availability and processing power for specific batch workloads, creating a strong economic moat.

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AI companies with the foresight to sign long-term, multi-year compute contracts gain a significant margin advantage. They lock in prices based on past valuations, while competitors are forced to buy capacity at much higher current market rates driven up by the increasing value of new AI models.

Instead of spending billions to be a distant #5 in the public cloud market, IBM's CEO acquired Red Hat. This strategic pivot allowed IBM to become a valuable partner to all major cloud providers, leveraging their growth instead of competing with it directly.

As AI commoditizes user interfaces, enduring value will reside in the backend systems that are the authoritative source of data (e.g., payroll, financial records). These 'systems of record' are sticky due to regulation, business process integration, and high switching costs.

SAP has thrived through multiple technology cycles by focusing on solving enduring business needs like finance and supply chain management. While the underlying technology evolves from mainframes to AI, the customer's need for business outcomes remains constant, making this focus the key to longevity.

Arvind Krishna predicts that the largest AI models will become commodities with low switching costs. This belief underpins IBM's strategy to *not* compete in building frontier models, but rather to partner with providers and focus on smaller, specialized enterprise models where they can build a moat.

As AI commoditizes software, the most defensible businesses are no longer asset-light SaaS models. Instead, companies with physical world operations, regulatory moats, and liability are safer investments. Their operational complexity, once a weakness, now serves as a formidable barrier against pure AI-driven disruption.

IBM CEO Arvind Krishna's strategy rests on the conviction that most enterprises will remain hybrid, avoiding lock-in to one public cloud. This creates a durable market for IBM's management software. The second pillar is focusing on deploying trusted AI in regulated industries, ceding the consumer space to others.

While modern UIs are essential, the backend IBM i (AS/400) platform remains entrenched in many businesses. The reason is its extreme reliability and stability, which would require massive, difficult, and expensive custom software development to achieve on open systems like Linux.

The high cost and data privacy concerns of cloud-based AI APIs are driving a return to on-premise hardware. A single powerful machine like a Mac Studio can run multiple local AI models, offering a faster ROI and greater data control than relying on third-party services.

Defensible companies build systems of record (like an ERP) that are so integral to a customer's operations that switching is prohibitively difficult. This creates a 'hostage' dynamic, providing a powerful moat against competitors, even those with better AI features.

IBM's Mainframe Business Thrives by Defying Cloud Economics | RiffOn