OpenAI's Choi maps how ChatGPT, Codex, APIs and the new Agents API fit together
TheMoonMidas · x · 2026-09-15
OpenAI's Derrick Choi published a guide explaining how the new Agents API differs from OpenAI's other APIs and SDKs, and where ChatGPT and Codex fit in the product stack. With digestible examples and diagrams, he shows developers can build on OpenAI capabilities without the ChatGPT or Codex apps, clarifying the role of each surface from end-user apps to developer tools.
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