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The ChatGPT/Codex app bundles a full copy of LibreOffice

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1st September 2026

I was poking around in my ~/.cache/ folder using OmniDiskSweeper when I spotted something interesting. The OpenAI Codex desktop app (since rebranded 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, git, and the LibreOffice open source office suite (which forked from OpenOffice.org in 2010):

Screenshot of a macOS disk usage app window in column view, titled "/Users/simon/.cache - 442.1 GB". First column: 356.8 GB huggingface, 82.5 GB uv, 1.7 GB codex-runtimes (selected), 609.0 MB datasette-sqlite, 298.8 MB rod. Second column: 1.7 GB codex-primary-runtime (selected). Third column: 1.7 GB dependencies (selected), 6.3 MB plugins, 4.1 kB runtime.json. Fourth column: 771.0 MB native (selected), 446.4 MB node, 440.6 MB python, 28.7 kB bin. Fifth column: 429.7 MB libreoffice-headless (selected), 187.9 MB poppler, 148.1 MB git, 4.7 MB libheif, 679.9 kB jxrlib.

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.

Posted 1st September 2026 at 7:03 pm

This is a note by Simon Willison, posted on 1st September 2026.

openoffice 3 open-source 318 ai 2,209 openai 452 generative-ai 1,957 llms 1,924 codex 56

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