Arm unveiled its Lumex Compute Subsystem (CSS) on September 10 at the Unlocked Summit in Shanghai, signaling its boldest step yet to elevate AI and gaming on flagship smartphones. The platform debuts the C1 CPU cluster based on Armv9.3 and the Mali G1 GPU lineup, headlined by the Mali G1-Ultra with support for second-generation Scalable Matrix Extensions (SME2). Together, they bring edge devices closer to data center-class performance.