tech
How OpenAI is using GPT-5 Codex to improve the AI tool itself
“The vast majority of Codex is built by Codex,” OpenAI told us about its new AI coding agent.
TL;DR
- OpenAI's Codex AI coding agent is now largely self-improving, with employees using it to build and enhance its own capabilities.
- Codex handles tasks such as writing features, fixing bugs, and managing its own training processes and feedback.
- The Sora Android app was developed by four engineers in 18 days using Codex for architecture planning, sub-plans, and implementation.
- Codex is integrated into project management and communication tools like Linear and Slack, acting as a 'teammate' for developers.
- OpenAI views Codex as an amplifier of human potential, not a replacement for software developers, emphasizing 'vibe engineering' where humans remain in the loop.
- The company aims to make coding agents like Codex useful for individuals without programming experience in the long term.
- Codex faces competition from similar AI coding tools from Anthropic, Google, and Mistral AI.