How is Flex Scaling CS-3 Manufacturing Capacity?
New production lines in Milpitas are expected to increase Cerebras CS-3 manufacturing capacity by approximately 7x through 2026 as demand for AI infrastructure continues to grow.
Flex and Cerebras Systems announced on July 9, 2026, an expanded manufacturing partnership to scale production of the Cerebras CS-3 artificial intelligence (AI) accelerator system at Flex's manufacturing facilities in Milpitas, California. According to the companies, the expansion is expected to increase CS-3 production capacity by approximately seven times through 2026 to meet rising demand for AI training and inference infrastructure.
The companies said the expansion includes new manufacturing lines, additional production floor space, expanded test infrastructure, and the hiring of additional skilled manufacturing workers in California. According to the companies, the investment reflects growing demand from AI model developers, cloud providers, and enterprise customers while expanding advanced manufacturing capacity in the United States.
"The CS-3 is unlike any computer system ever built, and scaling its production requires an extraordinary manufacturing partner," said Dhiraj Mallick, Chief Operating Officer of Cerebras. "Flex brings the technical depth, operational rigor, and manufacturing expertise needed to support that scale."
Mallick added that advanced AI systems are being built in the United States by engineers and technicians, despite the perception that AI hardware manufacturing is concentrated overseas.
What the Manufacturing Expansion Includes
According to Cerebras, the CS-3 is built on the company's wafer-scale engine architecture.The platform combines liquid cooling, high-density power delivery, precision mechanical assembly, and networking infrastructure for large-scale AI training and inference workloads.
The companies said manufacturing the CS-3 requires specialized handling processes, custom tooling, precision calibration, and extensive system-level validation. Flex engineers worked with Cerebras to develop dedicated assembly processes, automated test stations, and manufacturing methods designed specifically for wafer-scale computing systems.
Rob Campbell, President of Communication, Enterprise and Cloud at Flex said,"Every stage of the manufacturing process—from mechanical integration to thermal validation and final system qualification—required deep collaboration between our engineering teams. We thank Cerebras for their partnership in demonstrating what American advanced manufacturing can achieve when two highly technical organizations work side by side."
According to the companies, multiple new assembly and integration lines will come online through 2026. The Milpitas facility is also expanding its burn-in and validation areas, automated testing infrastructure, warehouse capacity, and logistics operations.
The companies said new tooling and fixtures will allow multiple CS-3 systems to move through integration and testing simultaneously, increasing production throughput while maintaining quality standards.
The expansion is also expected to support additional manufacturing, systems integration, quality, supply chain, and testing jobs in the region. According to the companies, the increased production capacity is intended to help meet growing global demand for high-performance AI infrastructure deployed both on premises and in the cloud.
>
Key Takeaways
- Expand manufacturing capacity for Cerebras CS-3 by seven times to meet AI demand.
- Invest in new production lines and skilled workforce in Milpitas, California.
- Utilize advanced manufacturing techniques for AI hardware development in the U.S.
- Cerebras CS-3 features cutting-edge wafer-scale engine architecture for AI workloads.
- Partnership with Flex enhances operational efficiency and production capabilities.