One UI 9.5 surfaces again, this time with the Galaxy S27 Ultra
Samsung's naming math for One UI 9 checks out, but there's nothing we didn't already expect.
Samsung has reportedly begun testing a new version of its mobile operating system, One UI 9.5, just weeks after officially unveiling One UI 9. The latest build, discovered on Samsung's test servers, is reportedly for the Galaxy S27 Ultra. This development comes after the official release of One UI 9, which is currently only available on the Galaxy Z Fold 8, Fold 8 Ultra, and Flip 8 series.
Although a beta version of One UI 9 has been accessible for the Galaxy S26 series for several months, Samsung has not provided any official timeline for its rollout to existing or older devices. Nevertheless, work on the next iteration, One UI 9.5, seems to have already commenced. According to tipster Fahad Ali Javed, who shared the information on X (via SamMobile), the build is intended for the US variant of the upcoming Galaxy S27 Ultra.
This speculation is based on the "S958U" at the beginning of the build number, which is the same prefix used for the Galaxy S26 Ultra, with a model number of SM-S948U.
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