Intel Core i5 6400 's Advantages
Lower TDP (65W vs 125W)
Intel Core i5 10600K 's Advantages
Released 4 years and 8 months late
Higher specification of memory (DDR4-2666 vs DDR4-2133)
Larger memory bandwidth (41.6GB/s vs 34.1GB/s)
Higher base frequency (4.1GHz vs 2.7GHz)
Larger L3 cache size (12MB vs 6MB)