OpenAI is split into three divisions. There is Research, where the frontier models are trained. There is Scaling and Infrastructure, which handles the massive computers this training relies on. And then there is Applications, which takes the product of these two groups’ work, “and then brings it to the people,” says Vijaye Raji, who is chief technology officer of the Applications division.

Raji leads key technical teams—such as data, experimentation, and growth—that help power ChatGPT and Codex, OpenAI’s coding tool, the use of which he says has made the company’s engineers “10 times more productive.” He is also responsible for the tech…

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