What is Codex?

Source: OpenAI Date: 2026-04-23 URL: https://openai.com/academy/what-is-codex

Summary

Title-only: An OpenAI Academy explainer page introducing Codex — the AI coding agent product — to new users or enterprise evaluators. Published on the same date as the GPT-5.5 launch (April 23, 2026) and the Codex enterprise scaling post, this is onboarding infrastructure accompanying Codex’s enterprise push. The “what is” framing targets decision-makers and teams new to agentic coding, not existing users.

Implications

The Codex as product thread. The Academy “What is Codex?” page signals that Codex has moved from developer product to mainstream enterprise offering requiring dedicated explainer content. This is the maturity indicator: when a product needs a “what is it?” page, it’s being sold to buyers who aren’t engineers. The audience for this content is IT decision-makers, CTOs, and procurement teams being pitched on Codex, not developers already using it.

Education as sales funnel. OpenAI Academy is both product education and demand generation. “What is Codex?” content drives search traffic, defines the category (“AI coding agent”), and sets evaluator expectations before a sales call. This is OpenAI doing what traditional enterprise software companies do — building the educational ecosystem that makes their product the default reference point for the category they’re trying to own.