OpenAI expands Codex with reusable cloud environments, code review tools and repository scanning

OpenAI announced a wider set of Codex updates at DevDay, centered on reusable cloud development environments that preserve project setup and installed dependencies so new tasks can start from a saved configuration across devices. OpenAI also updated the Codex CLI with voice controls, an /agents view for delegating and tracking work, prompt editing, session resume, worktrees and a cleaner terminal interface. Codex is also being integrated into a new code review workflow in the ChatGPT desktop app, where users can review summaries, inspect changes and ask about issues before commenting on pull or merge requests. On the security side, OpenAI is expanding Codex Security Cloud with tools to scan GitHub repositories on demand, on a schedule or when new commits arrive, then investigate findings, remove duplicates and prepare fixes in the cloud.