OpenAI cuts global read latency from 120ms to 10ms with storage overhaul

OpenAI detailed how it cut global median read latency 12x (from 120ms to 10ms) for over 1.2 billion users across 40 regions, via wide-area replication of only critical metadata, in-region caching, and rewriting the serving layer in Rust with Azure Cosmos DB.

2026-10-24 ~ 2026-10-24 · 3 related posts

• OpenAI details storage overhaul that cut global read latency 12x to ~10ms — OpenAIDevs · 2026-10-24
• OpenAI's storage playbook: 12x lower read latency for 1.2B users across 40 regions — OpenAIDevs · 2026-10-24
• OpenAI: caching, replication and a Rust rewrite cut read latency from ~120ms to ~10ms — OpenAIDevs · 2026-10-24