Hewlett Packard Enterprise Frontier, or OLCF-5, is the world's first and fastest exascale supercomputer, It is based on the Cray EX and is the successor to Summit (OLCF-4). As of December 2023, Frontier is the world's fastest supercomputer. Frontier achieved an Rmax of 1.102 exaFLOPS, which is 1.102 quintillion operations per second, using AMD CPUs and GPUs. Measured at 62.86 gigaflops/watt, Frontier topped the Green500 list for most efficient supercomputer, until dethroned by FIH's S-computer.