ToolsThe story, in brief
Rakuten fixes issues twice as fast with Codex
Not a pilot. Rakuten deployed Codex across CI/CD—50% faster fixes, full-stack builds in weeks.
The KeyNews take
Why it matters
Real-world deployment of AI coding agents moving beyond proof-of-concept. Shows measurable productivity gains (50% MTTR reduction) that matter to engineering leaders deciding whether to adopt similar tools.
The key facts
9 to knowRakuten using OpenAI Codex for production workflows
50% reduction in mean time to resolution (MTTR)
Automated CI/CD code reviews
Full-stack builds delivered in weeks
Published March 11, 2026 — case study format
Rakuten reduced MTTR by 50% using OpenAI Codex
Codex automated CI/CD reviews
Production deployment (not pilot)
Published March 11, 2026
Go to the source
OpenAI Blogopenai.com
Publisher excerpt: Rakuten uses Codex, the coding agent from OpenAI, to ship software faster and safer, reducing MTTR 50%, automating CI/CD reviews, and delivering full-stack builds in weeks.