Today, we announced significant price-performance improvements for Cloud Spanner, now providing up to 50% increase in throughput and 2.5 times the storage per node than before, with no change in price. 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. These upgrades will be rolled out to all Spanner customers in the coming months, without the need for reprovisioning, downtime, or any user action...
https://cloud.google.com/blog/products/databases/announcing-cloud-spanner-price-performance-updates/