Flex and Cerebras Systems announced an expanded manufacturing partnership to increase production of the CS-3 AI accelera

Flex and Cerebras Systems Inc. announced an expanded manufacturing partnership on July 9, 2026, to scale production of the Cerebras CS-3, one of the world's most advanced AI accelerator systems, at Flex manufacturing facilities in Milpitas, California. The collaboration reflects a significant expansion of advanced manufacturing capacity in the United States at a time when electronics manufacturing is often associated with overseas supply chains.

The expanded operation is expected to increase CS-3 production capacity by approximately 7x through 2026, supported by new production lines, expanded floor space, advanced test infrastructure, and additional skilled manufacturing talent based in California. Dhiraj Mallick, COO of Cerebras, stated: "The CS-3 is unlike any computer system ever built, and scaling its production requires an extraordinary manufacturing partner. Flex brings the technical depth, operational rigor, and manufacturing expertise needed to support that scale. People often think the entire AI manufacturing and packaging supply chain lives overseas, but everyday across the U.S., teams of American engineers and technicians are building state-of-the-art AI systems that power frontier AI workloads around the world."

The CS-3 is built on Cerebras' wafer-scale engine architecture, featuring a processor physically larger than any conventional AI chip. The system integrates advanced liquid cooling, high-density power delivery, precision mechanical assembly, and coordinated networking infrastructure for large-scale AI training and inference.

Manufacturing the CS-3 presents challenges rarely encountered in traditional server production, requiring specialized handling processes, custom tooling, precision calibration, and extensive system-level validation. Flex engineers developed dedicated assembly flows, automated test stations, and new manufacturing methodologies tailored to wafer-scale computing. Rob Campbell, President of Communication, Enterprise and Cloud at Flex, noted: "The CS-3 does not resemble a conventional server or rack-scale compute platform. Every stage of the manufacturing process—from mechanical integration to thermal validation and final system qualification—required deep collaboration between our engineering teams."

Inside the Milpitas facility, production spans precision mechanical assembly, high-power electrical integration, liquid cooling installation, optical networking validation, and full-rack system qualification. The site has expanded into a high-throughput manufacturing environment with parallel integration lines, enhanced burn-in and validation areas, automated test infrastructure, and increased warehouse and logistics capacity. The expansion is also contributing to high-skilled manufacturing roles across the region in manufacturing, systems integration, quality, supply chain, and testing.