Samsung Galaxy S25 Ultra VS Xiaomi 15S Pro

Both the Samsung Galaxy S25 Ultra and the Xiaomi 15S Pro share the same IP68 waterproof rating, meaning both can withstand submersion in water under the same standardized conditions. Neither has a rugged build or a foldable form factor, so they occupy the same category: premium, flat-slab flagship. For most users, the protection story is identical.

Where the two diverge slightly is in their physical footprint. The S25 Ultra is noticeably wider at 77.6 mm compared to the 15S Pro's 75.3 mm, a 2.3 mm difference that is genuinely perceptible in one-handed use. The S25 Ultra is also marginally taller (162.8 mm vs 161.3 mm) and carries a slightly larger overall volume (103.6 cm³ vs 100.8 cm³). Thickness and weight are effectively tied — 8.2 mm vs 8.3 mm and 218 g vs 216 g are differences no user will feel in practice.

The Xiaomi 15S Pro holds a modest but real ergonomic edge here. Its narrower chassis makes it the more pocket-friendly and single-hand-manageable of the two, which matters for a device in this size class. The S25 Ultra offers nothing in the Design group to offset that advantage — both devices are otherwise equivalent in build protection and form factor type.

On paper, these two displays are closely matched — both are OLED/AMOLED panels running at 120Hz with a 1440p resolution, damage-resistant glass, Always-On Display, and HDR10+ support. The shared foundation is strong, and either screen will deliver excellent contrast, deep blacks, and smooth scrolling in everyday use.

The meaningful differences emerge when you dig into the details. The S25 Ultra's larger 6.9″ screen offers more real estate for media, multitasking, and the S Pen — but the Xiaomi 15S Pro's 6.73″ panel counters with a higher pixel density of 521 ppi versus 498 ppi, making individual pixels slightly harder to discern at normal viewing distances. More significantly, the 15S Pro adds Dolby Vision support, a HDR format that the S25 Ultra lacks entirely. For users who stream content from platforms that deliver Dolby Vision masters — Netflix, Apple TV+, Disney+ — this translates to richer tone-mapping and more accurate color grading on supported titles.

The Xiaomi 15S Pro takes the edge in this category. Its sharper pixel density and Dolby Vision certification give it a qualitative advantage in display fidelity, particularly for HDR content consumption, and that outweighs the S25 Ultra's modest size advantage for most display-focused use cases.

This is one of the most nuanced performance matchups the specs reveal. The Samsung Galaxy S25 Ultra runs Qualcomm's Snapdragon 8 Elite, a well-established flagship SoC, while the Xiaomi 15S Pro debuts Xiaomi's own in-house Xring O1 — a significant milestone for the brand. Both are fabbed on a 3 nm process, so neither holds a manufacturing edge there.

The benchmark picture is genuinely split. The S25 Ultra leads in raw CPU throughput — its Geekbench 6 single-core score of 3057 and multi-core score of 9846 both outpace the 15S Pro's 2709 and 8125 respectively, which matters for tasks that are latency-sensitive like app launches and UI responsiveness. The S25 Ultra also holds an edge in memory bandwidth at 85.1 GB/s versus 76.8 GB/s, and its RAM runs faster at 5300 MHz. However, the 15S Pro's AnTuTu score of 3,004,137 dwarfs the S25 Ultra's 2,207,809 — a ~36% gap that AnTuTu's heavier GPU and system weighting largely attributes to the Immortalis-G925's higher GPU clock of 1612 MHz versus the Adreno 830's 1200 MHz. The 15S Pro also ships with 16 GB of RAM as its base configuration versus 12 GB, giving it more headroom for aggressive multitasking.

Neither device is a clear overall winner — the S25 Ultra is the stronger CPU performer, while the 15S Pro leads in GPU-accelerated and system-level workloads and offers more RAM. For gaming and GPU-intensive tasks, the 15S Pro has a data-backed edge; for single-threaded responsiveness and memory-latency-sensitive workflows, the S25 Ultra holds its own.

The Samsung Galaxy S25 Ultra and the Xiaomi 15S Pro both feature multi-lens main cameras. The Galaxy S25 Ultra has a 200 MP, 50 MP, 50 MP, and 10 MP configuration, while the Xiaomi 15S Pro offers three 50 MP lenses. The wide apertures differ slightly, with the Galaxy S25 Ultra having apertures of f/1.7, f/3.4, f/1.9, and f/2.4, while the Xiaomi 15S Pro's lenses have f/1.4, f/2.5, and f/2.2 apertures. Both devices support optical zoom of 5x and have built-in optical image stabilization to reduce blur in photos and videos.

For video recording, the Galaxy S25 Ultra supports 4320 x 30 fps resolution, while the Xiaomi 15S Pro records at 4320 x 24 fps. Both devices have phase-detection autofocus for photos, continuous autofocus during video recording, and the ability to shoot in slow motion. The Galaxy S25 Ultra also supports HDR10 recording, but the Xiaomi 15S Pro supports both HDR10 and Dolby Vision recording, which may offer superior color and dynamic range for compatible content.

Both smartphones come with advanced camera features such as manual exposure, ISO, focus, and shutter speed control. The front camera of the Galaxy S25 Ultra is 12 MP with a f/2.2 aperture, while the Xiaomi 15S Pro has a 32 MP front camera with a f/2.0 aperture. Neither device includes a front-facing LED flash, and both can create panoramas in-camera. The Galaxy S25 Ultra has a BSI sensor, while the Xiaomi 15S Pro does not, but it does feature a CMOS sensor like the Galaxy S25 Ultra. Neither phone shoots 360° panoramas or supports 3D photo/video recording.

Both the Samsung Galaxy S25 Ultra and the Xiaomi 15S Pro run on Android 15, offering a similar base operating system experience. They share several features, including clipboard warnings, location privacy options, camera/microphone privacy options, theme customization, and the ability to block app tracking. Both devices support dark mode, dynamic theming, and focus modes. They also allow playing games while they download, offer customizable notifications, and support media pickers and split-screen functionality.

There are a few differences between the two. The Galaxy S25 Ultra supports blocking cross-site tracking, while the Xiaomi 15S Pro does not. Additionally, the Galaxy S25 Ultra offers Wi-Fi password sharing, which is not available on the Xiaomi 15S Pro. The Galaxy S25 Ultra also includes an extra dim mode, PiP (Picture-in-Picture), and can be used as a PC, which the Xiaomi 15S Pro lacks. On the other hand, the Xiaomi 15S Pro supports Dolby Vision recording, a feature the Galaxy S25 Ultra does not have.

Both devices share features like offline voice recognition, voice commands, and multi-user system support. They can track the current position of the mobile device and offer a child lock. Neither device gets direct OS updates, and both lack Quick Start functionality. Both are free and open source and support widgets.

The Samsung Galaxy S25 Ultra and the Xiaomi 15S Pro both come with non-removable rechargeable batteries. The Galaxy S25 Ultra has a 5000 mAh battery, while the Xiaomi 15S Pro features a larger 6100 mAh battery, offering more capacity. Both devices support wireless charging, but the Xiaomi 15S Pro has a faster wireless charging speed of 50W, compared to the Galaxy S25 Ultra's 15W. Similarly, the Xiaomi 15S Pro also supports faster wired charging at 90W, while the Galaxy S25 Ultra supports up to 45W fast charging.

Both devices offer reverse wireless charging, with the Galaxy S25 Ultra supporting a reverse charging speed of 4.5W and the Xiaomi 15S Pro supporting a faster 10W reverse charging speed. Neither phone has a removable battery, but both include a battery level indicator and have rechargeable batteries. They also share the feature of supporting fast charging and wireless charging, providing flexible power options.

Overall, the Xiaomi 15S Pro has a larger battery capacity and faster charging speeds, both for wired and wireless charging, compared to the Samsung Galaxy S25 Ultra.

Both the Samsung Galaxy S25 Ultra and the Xiaomi 15S Pro lack a 3.5 mm audio jack, so users will need to rely on wireless or USB-C audio solutions. Both phones are equipped with stereo speakers for enhanced audio output. The Galaxy S25 Ultra supports aptX, LDAC, and aptX HD, while the Xiaomi 15S Pro also supports aptX HD, aptX Adaptive, but does not support aptX or LDAC. Neither phone supports aptX Lossless or has a radio.

The key difference in audio technologies between the two is the Galaxy S25 Ultra’s inclusion of LDAC, which allows for high-resolution audio streaming over Bluetooth, while the Xiaomi 15S Pro supports aptX Adaptive, offering dynamic adjustment to sound quality based on connection strength, but lacks LDAC support.

Overall, both devices provide strong wireless audio support, but the Galaxy S25 Ultra has a slight edge with LDAC support, while the Xiaomi 15S Pro focuses more on adaptability with aptX Adaptive.

Both the Samsung Galaxy S25 Ultra and the Xiaomi 15S Pro support 5G connectivity and feature Wi-Fi capabilities including Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax), Wi-Fi 6E (802.11ax), and Wi-Fi 7 (802.11be). They also support Bluetooth 5.4, USB Type-C 3.2, NFC, and have a fingerprint scanner for security. Both devices have GPS, a compass, an accelerometer, and a barometer, but there are a few notable differences in features.

The Galaxy S25 Ultra has dual-SIM support with both 2 SIM cards and 2 eSIMs, while the Xiaomi 15S Pro only supports 2 SIM cards without the eSIM functionality. Additionally, the Galaxy S25 Ultra supports ANT+ for compatibility with fitness and health devices, whereas the Xiaomi 15S Pro does not support ANT+. The Xiaomi 15S Pro does include an infrared sensor, which the Galaxy S25 Ultra lacks, but the Galaxy S25 Ultra includes a stylus, a feature absent on the Xiaomi 15S Pro.

Neither device supports emergency SOS via satellite, crash detection, DLNA certification, 3D facial recognition, iris scanning, motion tracking, optical tracking, or a built-in projector. Both smartphones support Galileo for enhanced positioning, and neither device includes an external memory slot, HDMI output, or a heart rate monitor. Overall, the two devices are similar in connectivity but have a few unique features, with the Galaxy S25 Ultra offering more flexibility in terms of SIM card options and the Xiaomi 15S Pro including an infrared sensor.

Both the Samsung Galaxy S25 Ultra and the Xiaomi 15S Pro come with a video light, but neither phone features sapphire glass displays, curved displays, or e-paper displays. These aspects are identical between the two devices, with no differences noted in this category.

While both devices include a video light for improved lighting during video recording, their displays are not equipped with the advanced technologies like sapphire glass or curved edges, which are often seen in higher-end models. Additionally, neither of the two phones offers an e-paper display, which is typically used for low-power, high-readability screens.

In summary, the Galaxy S25 Ultra and the Xiaomi 15S Pro share the same features in this group, with video lights included but lacking sapphire glass, curved displays, and e-paper displays.