“Spanner’s high throughput, virtually unlimited scale, single-digit millisecond latency, five 9s availability SLA, and strong external-consistency semantics are now available at half the cost of Amazon DynamoDB for most workloads.”
Google gave Spanner up to 50% more throughput and raised storage per node from 4TB to 10TB at the same price. The headline compares it to DynamoDB “for most workloads,” and Google picked the workloads. It also brags that Spanner peaks at 3 billion queries per second against DynamoDB’s 126 million, which counts Gmail and Ads traffic no customer will ever run. Price cuts this deep are how a third-place cloud buys migrations.