Rakuten fixes issues twice as fast with Codex

Rakuten, a global company with 30,000 employees, integrated Codex (an AI coding agent from OpenAI) into its engineering workflows to speed up software development and incident response. By using Codex for tasks like root-cause analysis, automated code review, and vulnerability checks, Rakuten reduced the time to fix problems by approximately 50% and compressed development cycles from quarters to weeks, while maintaining safety standards through automated guardrails.