OpenAI Codex Testing: How to QA AI-Written Code

OpenAI Codex is an autonomous coding agent that can take a task, implement it across your codebase, and produce a pull request - without a developer writing a line of code. For engineering teams, that is a significant acceleration. For QA teams, it raises an immediate question: who verifies what Codex wrote? The honest answer for most teams: nobody, systematically. Codex generates code faster than any human can review it end-to-end. Manual verification does not scale. And most teams have not yet built the automated QA layer that would catch what Codex misses.