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Introduction: the enduring relevance of mainframes and the need to modernize
Enterprise mainframes remain indispensable in 2026. More than 70% of Fortune 500 companies’ core transaction processing still runs on mainframe systems, which handle trillions of dollars in daily transactions across banking, insurance, healthcare, and government .
Mainframes are trusted for their unmatched reliability, security, and performance – for instance, IBM’s z16 and the new z17 include on-processor AI inferencing capabilities for submillisecond fraud detection within credit card transactions. This level of throughput and resilience, especially when combined with emerging AI enhancements, remains difficult to replicate with distributed cloud architectures at similar cost, scale and security.
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