OpenAI detailed how its engineering team developed and shipped the Sora app for Android in just 28 days by leveraging Codex, the AI coding assistant powered by an early GPT-5.1-Codex model.
A small team of four engineers set up the core architecture, patterns, and quality standards, then used Codex to generate about 85 % of the application’s code, dramatically accelerating development.
The Android release quickly topped the Google Play Store and achieved a high crash-free rate, demonstrating how AI-assisted coding can boost productivity when paired with human oversight and clear guidance.
