❯ OpenAI Uses Two Engineers and Codex to Rewrite Storage Platform, Cutting CPU Use Sixfold

Production migrationOpenAI said two engineers used Codex and GPT-5.5 in the second quarter to rewrite its Habitat online-storage platform from Python to Rust. The new service is six times more CPU-efficient, handles 95% of production requests and processes more than 70 million requests per second.

Engineering boundaryOpenAI said Habitat supports products used by more than 1 billion people each week. A migration at that scale has to preserve compatibility, data correctness and latency. Codex produced much of the implementation while the engineers controlled architecture, testing and rollout. Production review standards remain high, and moving 95% of traffic still requires staged deployment.

Cost resultSixfold CPU efficiency reduces general-purpose compute needs and creates headroom for growth. Engineering teams can recalculate the staffing and risk of large rewrites when agents handle mechanical migration, but humans retain responsibility for failures and rollback.

▪ SIGNALCodex is being sold here as more than code completion: it compressed an infrastructure rewrite into a project two engineers could still control.