Models · OpenAI
How we tapped Codex to build Sora for Android in 28 days
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By Patrick Hum and RJ Marsan, Members of the Technical Staff.
Key facts
- From October 8 to November 5, 2025, a lean engineering team working alongside Codex and consuming roughly 5 billion tokens, shipped Sora for Android from prototype to global launch
- Working this way, they shipped an internal build of Sora for Android to employees in 18 days and launched publicly 10 days later
- If you’re wondering whether they used a secret model, they used an early version of the GPT‑5.1‑Codex model – the same version that any developer or business can use today via CLI, IDE extension, or web
- By Patrick Hum and RJ Marsan, Members of the Technical Staff
Summary
In November, they launched the Sora Android app to the world, giving anyone with an Android device the ability to turn a short prompt into a vivid video. Behind the launch is a story: the initial version of Sora’s production Android app was built in 28 days, thanks to the same agent that’s available to any team or developer: Codex. From October 8 to November 5, 2025, a lean engineering team working alongside Codex and consuming roughly 5 billion tokens, shipped Sora for Android from prototype to global launch. When Sora launched on iOS, usage exploded.