HOW WE USED CODEX TO BUILD SORA FOR ANDROID IN 28 DAYS

Summary from the TLDR AI newsletter

The initial version of Sora's production Android app was built in 28 days using OpenAI Codex. It took a lean engineering team and roughly 5 billion tokens to ship the project. The app has a crash-free rate of 99.9%. This article describes how OpenAI used GPT-5.1-Codex - the same version available to any developer or business - to build the app.