Rakuten fixes issues twice as fast with Codex
That’s why Yusuke Kaji, General Manager of AI for Business at Rakuten, has spent the past year pushing agentic workflows deeper into how teams plan, build, and validate software. [Codex](https://openai.com/codex/)—the coding agent from OpenAI—has become a core part of Rakuten’s engineering stack, especially where the company needs to move faster without compromising security.
- Agent or tool
- OpenAI
- Topic
- Sales & Marketing
- Reported on
- Case study (OpenAI)
- Added
- 2026-11-11
Why it matters
Sales and marketing run on research, lists and follow-ups. Agents are starting to take on that groundwork, freeing people for the conversations that actually close deals. It is one of 613 sightings filed under Sales & Marketing on Agent Sightings (number 248 by interest), and one of 25 involving OpenAI.
How you could try it
Here is a reusable prompt, written by us in our own words, that captures the task. Paste it into OpenAI or any similar agent and adjust the details to your situation.
I want an agent to do the research and drafting for this sales or marketing workflow, and stop for my approval before anything is sent. The tool in the source case was OpenAI.
Tip: Start small: run it once on a low-stakes example, read what the agent did, and only then let it run on real work.
Source
Read the original first-hand account on Case study (OpenAI): https://openai.com/index/rakuten. Our summary is a paraphrase; details are in the source.
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