Intel Core i5 6400 's Advantages
Higher base frequency (2.7GHz vs 2.5GHz)
Intel Core i5 13500 's Advantages
Released 7 years and 4 months late
Higher specification of memory (DDR5-4800 vs DDR4-2133)
Larger memory bandwidth (89.6GB/s vs 34.1GB/s)
Newer PCIe version (5.0 vs 3.0)
Larger L3 cache size (24MB vs 6MB)
More modern manufacturing process (10nm vs 14nm)