Blackwell + Neuron SDK v3 + TPU v6: the Blackwell-era cloud inference stack — three vendors, three answers to the same GPU generation

NVIDIA Blackwell (the GPU generation that defines the period), AWS Inferentia3 + Neuron SDK v3 (AWS's answer to Blackwell-era inference), and Google TPU v6 Trillium (Google's answer) together define the Blackwell-era cloud inference stack. Each vendor positions on a different mix of cost, latency, and model coverage — NVIDIA on raw GPU throughput + ecosystem lock-in, AWS on per-instance pricing + Neuron-native model coverage, Google on TPU pod topology + Vertex AI integration. The three are not equivalent: they have different deployment models, different SDKs, and different per-model performance profiles.