In his Day 9 update, Tibo (@thsottiaux) said the ChatGPT and Codex desktop apps had rolled out an optimization to how they store state on disk, which should reduce disk storage by 60%. He described it as a small improvement and cited feedback from power users running short on disk space.
The attached X screenshot shows the verified account, the Day 9 post, and “Last edited 7:32 AM · October 14, 2026.” That is an edit time; the screenshot does not display a timezone. The post ID decodes to a creation time of 2026-10-13 23:32:43.847 UTC. The post does not name client versions or a measurement method, so 60% is the author’s stated expected effect, not an independently measured result.