Codex

AI: Codex is an AI coding agent developed by OpenAI for software engineering tasks such as writing code and fixing bugs, released in April 2025 as Codex CLI.[2] Codex is available through ChatGPT's web app, the Codex CLI, a desktop app for Windows and macOS,[3] and several IDE integrations. https://en.wikipedia.org/wiki/OpenAI_Codex_(AI_agent)

Books: The codex (pl.: codices /ˈkoʊdɪsiːz/)[1] was the historical ancestor format of the modern book. Technically, the vast majority of modern books use the codex format, of a stack of pages bound at one edge. However, the term codex is usually reserved for older manuscript books, which mostly used sheets of vellum, parchment, or papyrus, rather than paper.[2] By convention, the term is also used for any Aztec codex (although the earlier examples do not actually use the codex format), Maya codices and other pre-Columbian American manuscripts. https://en.wikipedia.org/wiki/Codex