AWS Launches Trainium3 AI Chip at re:Invent, Teases Nvidia-Compatible Trainium4

Summary

Amazon Web Services launched its Trainium3 AI training chip at re:Invent 2025 on December 2, 2025, marking a significant escalation in the custom silicon race for AI workloads. Built on TSMC's 3nm process, each Trainium3 chip delivers 2.52 petaflops of FP8 compute, with 144 GB of HBM3e memory and 4.9 TB/s of memory bandwidth. The chip adds support for FP32, BF16, MXFP8, and MXFP4 data types, along with hardware-level support for structured sparsity, micro-scaling, and stochastic rounding. AWS i