OpenAI Builds Sora Android App in 28 Days with Codex

13 Dec 2025

OpenAI utilized Codex to develop the Sora Android app in just 28 days, significantly optimizing the software development process.

Engineering Process

Four engineers executed the project, utilizing Codex, an AI code generator. This tool processed approximately five billion tokens to accomplish the task. OpenAI reported that by using Codex, the team could rapidly translate the existing iOS app code into Android-compatible formats. Consequently, human developers concentrated on architecture, planning, and verification.

Project Outcome

Despite the accelerated timeline, OpenAI claimed the app achieved 99.9 percent stability. The team praised Codex as a productive collaborator, assisting in coding tasks similar to an experienced engineer while requiring clear instructions. This collaboration underlined Codex's potential impact on software engineering efficiency.

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