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Samsung’s rollout of One UI 8, based on Android 16, was unusually fast, and not just because the company pulled out all the stops to avoid a drip-fed rollout like One UI 7’s. For the first time, Samsung has adopted the same Trunk Stable development model Google has been using to streamline Android updates (Source: Mishaal Rahman for Android Authority). This could mark a major shift in how quickly Galaxy devices get new software moving forward.
For years, Samsung lagged behind Google when it came to update speed. While Pixels typically received new versions of Android at launch, Galaxy owners were often left waiting months. But with the release of its Galaxy Z Fold and Z Flip devices earlier this month — both shipping with One UI 8 barely a month after Android 16 dropped — Samsung showed it’s now capable of moving much faster.
The difference comes down to how the code is developed. Traditionally, both Google and its OEM partners followed a branch-based model: a new version of Android would be spun off into its own branch, features would be added, and then — often painfully — the branch would need to be merged back into the main codebase. The problem? These merges frequently caused conflicts, with different teams’ work colliding in ways that broke things and consumed huge amounts of engineering time.
As Google’s President of Android Sameer Samat told Android Police earlier this year, the old system made it especially difficult to maintain older devices alongside new ones. Adding new features or fixes meant trying to retrofit them into an outdated branch, often leading to months of extra work.
That inefficiency is why Google switched to Trunk Stable, a trunk-based model where all development happens on a single, always-stable branch. New features are added behind “feature flags” — essentially switches that keep unfinished code inactive until it’s ready. This way, the codebase stays stable, but engineers can continue building without risking catastrophic conflicts.
The Samsung Galaxy Watch 8 Classic showing the new One UI 8 Watch widget layout
The change could also benefit the specialized smartwatch and tablet versions of One UI.
Now, Samsung has confirmed it’s fully on board. Sally Hyesoon Jeong, Executive VP and Head of Framework R&D for Samsung’s Mobile eXperience Business, said during a Galaxy Unpacked roundtable that the company worked closely with Google to adapt its own One UI development to the Trunk Stable model.
The result was immediate: One UI 8 shipped far closer to Android 16’s release than any previous Samsung update cycle. Jeong credited the new process for the accelerated pace, noting that Samsung aims to keep up with Google’s cadence going forward.
While Google doesn’t require OEMs to use Trunk Stable — after all, Android partners get the platform code but develop their own skins independently — Samsung saw the benefits and jumped in. The move could help the company finally shed its reputation for sluggish updates.
The broader effects on update strategies
Branch- vs. trunk-based development’s effect on OS releases.
This isn’t just about launch timing. When Google moved to Trunk Stable, it was able to extend update support for the Pixel 6 and Pixel 7 by two years — something Samat confirmed wouldn’t have been possible under the old system. The ability to apply improvements to both new and older devices simultaneously is one of the model’s biggest advantages.
If Samsung can maintain the momentum it showed with One UI 8, Galaxy owners might see not only faster updates but also longer support lifespans. Of course, execution is key. As with Google, the test will be whether Samsung can keep its trunk stable enough to deliver new features without slipping back into delays.
For now, though, One UI 8’s swift arrival suggests that Trunk Stable isn’t just a Google advantage anymore — it could soon be the new normal for Galaxy devices.
