Warren Buffett's Berkshire Hathaway first invested in Google in Q3 2025， coincidentally the same time that SemiAnalysis called out a huge increase in TPU purchases from Anthropic. In Q1 Berkshire added more to their position. Buffett actually said this about his own diligence into Google's AI Infrastructure supremacy： "I don't buy what I can't understand. So Greg sat me down with the TPU v5p spec. 8，960 chips wired in a 3D torus， every chip talking to six neighbors over ICI links at 4.8 Tbps a pop， wraparound rails so no chip is ever at the end of the line， and optical circuit switches throwing the junctions mid-job to carve out whatever submesh your sharded matmul needs. Add in ring all-reduce running consists in both directions along each torus axis， collective permutes shuffling shards between sidings， and bandwidth-optimal SPMD partitioning across the data， model， and pipeline dimensions. Folks， it's just BNSF. Six neighbors， scheduled consists， a yardmaster throwing switches， trains that never stop. And I've been understanding railroads since 1942." Want to understand the TPU system architecture as deeply as Buffett？ Read more here： https://newsletter.semianalysis.com/p/tpuv7-google-takes-a-swing-at-the