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Rapidly scaling online storage to serve over 1 billion ChatGPT users (Part II)

OpenAI · OpenAI Blog · Oct 23, 2026 · Engineering Insights

OpenAI scaled Habitat storage system to deliver 12× faster reads for ChatGPT's billion users

OpenAI published Part II of its deep dive into scaling Habitat, the storage backend for ChatGPT, achieving 12× faster read performance through multi-tenancy, global caching, and Azure Cosmos DB integration. The engineering details reveal the infrastructure complexity required to serve over 1 billion ChatGPT users reliably. While technically significant, this is an infrastructure retrospective rather than a new product or capability announcement.

openai chatgpt infrastructure azure storage scaling

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