Codex bundles LibreOffice OpenAI's Codex desktop app, now rebranded as ChatGPT, bundles a 1.7GB runtime that includes full Python and Node.js installations, native binaries for Poppler, git, and the LibreOffice open source office suite, according to a blog post by Simon Willison. The runtime, located in the `codex-primary-runtime` folder, includes skills that enable Codex to use these tools for document processing. I was poking around in my ~/.cache/ folder using OmniDiskSweeper https://www.omnigroup.com/more when I spotted something interesting. The OpenAI Codex desktop app since rebranded https://help.openai.com/en/articles/20001276-moving-to-the-new-chatgpt-desktop-app to just ChatGPT has 1.7GB of stuff in there in a folder called codex-primary-runtime , including a full Python installation, a full Node.js installation, and native binaries for Poppler https://poppler.freedesktop.org , git, and the LibreOffice https://en.wikipedia.org/wiki/LibreOffice open source office suite which forked from OpenOffice.org in 2010 : The ~/.cache/codex-runtimes/codex-primary-runtime/plugins/openai-primary-runtime/plugins/documents folder includes skills which tell Codex how to find and use those binaries. Tags: codex https://simonwillison.net/tags/codex , generative-ai https://simonwillison.net/tags/generative-ai , openai https://simonwillison.net/tags/openai , ai https://simonwillison.net/tags/ai , llms https://simonwillison.net/tags/llms , openoffice https://simonwillison.net/tags/openoffice , open-source https://simonwillison.net/tags/open-source