Analysis of the ~/.cache/ folder from the OpenAI Codex app reveals a 1.7GB directory called codex-primary-runtime. This folder contains full Python and Node.js installations, native binaries for tools like Poppler and git, and LibreOffice open source office suite binaries.
The LibreOffice binaries are located in a subfolder that includes skills for Codex to locate and utilize these binaries. This setup indicates that Codex can interact with LibreOffice through embedded binaries, potentially enabling document processing capabilities.
For engineers managing models or agents, this suggests that Codex has pre-included support for open-source office tools, which could influence deployment environments or integration workflows. Understanding these embedded resources can aid in optimizing model performance and resource management.
Source: https://simonwillison.net/2026/Sep/1/codex-libreoffice/