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Credit: Paul Jones / Android Authority

TL;DR

• Just weeks after the official One UI 9 release, Samsung already appears to be testing One UI 9.5
• The latest build, spotted on Samsung’s test servers, appears to be for the Galaxy S27 Ultra.
• Sadly, that’s all we know of Samsung’s upcoming UI.

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Samsung’s latest firmware, One UI 9, was officially announced only a couple of weeks ago, but it remains exclusive to the Galaxy Z Fold 8, Fold 8 Ultra, and the Flip 8. While a beta has been available for the Galaxy S26 series for several months, Samsung hasn’t specified One UI 9’s official rollout timelines for existing or older devices. Despite that, work for the next iteration, i.e., One UI 9.5, already appears to have begun.

The first One UI 9.5 build has supposedly surfaced on Samsung’s test servers, hinting at active trials for the upcoming firmware. According to tipster Fahad Ali Javed, who shared the purported evidence on X (via SamMobile), the build is meant for the US variant of the yet-to-be-released Galaxy S27 Ultra. This assumption is based on the “S958U” at the beginning of the build number, as the Galaxy S26 Ultra bears the model number SM-S948U.