Xiaomi 15S Pro Review
The MobGadgets Verdict
The Xiaomi 15S Pro is a bold step for Xiaomi, showcasing its in-house Xring O1 chipset and delivering standout battery life alongside a gorgeous display. It feels premium and distinct, especially in the fiber edition. Yet it’s not without trade-offs:...
Overview
The Xiaomi 15S Pro marks a pivotal moment for Xiaomi as the first smartphone to ship with its in-house Xring O1 3nm chipset. Launched in China on May 22, 2025, this flagship balances premium hardware with a strategic shift toward self-developed silicon. It offers a stunning LTPO AMOLED display, exceptional battery endurance, and a refined design—including an optional carbon-fiber finish. However, early reviews indicate the custom SoC can run hot during extended gaming, and the speakers fall below flagship standards. For buyers prioritizing battery life and a unique chipset story, the 15S Pro is a compelling, if niche, contender in the premium Android space.
Design & Build Quality
The Xiaomi 15S Pro exudes a confident, high-end build. It carries an IP68 rating for dust and water resistance and uses shatterproof glass of 2024 generation. The highlight is the “Longlin Fiber Edition” with a carbon-fiber-inspired back that reviewers describe as supercar-grade and premium. At 161.3 x 75.3 x 8.3 mm and 216 g, it feels substantial but well-balanced. The haptics are precise and high-quality, adding a tactile polish. The device also reintroduces UWB technology, a key addition for seamless integration with Xiaomi’s ecosystem—particularly for car unlocking. Overall, the design is both durable and distinctive, with the fiber variant standing out from the usual glass slabs.
Display
The 6.73-inch LTPO AMOLED display delivers a sharp 1440 x 3200 resolution, smooth 120Hz refresh, and a remarkable 3200 nits peak brightness. Reviewers consistently praise its clarity and outdoor visibility, making it easy to use under direct sunlight. The panel quality is described as high, with vibrant colors and deep blacks typical of top-tier OLEDs. Whether you’re consuming media or browsing, this screen leaves little to complain about. It is one of the strongest attributes of the 15S Pro, matching or exceeding expectations for a premium flagship.
Performance
Under the hood, the Xring O1 chipset—a 3nm 10-core CPU paired with a 16-core Immortalis-G925 GPU—is the headline act. Reviewers view this custom SoC as a significant milestone for Xiaomi, though they note it is still maturing compared to established rivals like those from Qualcomm. In day-to-day use, the phone feels snappy and fluid, backed by 16GB of RAM and fast UFS 4.1 storage. However, under sustained gaming loads, the chipset exhibits noticeable heat build-up and thermal throttling, which can impact performance in intense sessions. This makes the 15S Pro better suited for general productivity and moderate gaming than for hardcore mobile gamers seeking the absolute peak sustained frame rates.
Software & UI
The Xiaomi 15S Pro runs Android 15 with HyperOS 2 on top. The software experience is typical of Xiaomi’s recent flagships—functional and feature-rich, though some users may find it cluttered. A standout addition is UWB support, which enhances ecosystem integration for tasks like unlocking compatible Xiaomi cars. The haptics are precise, adding a premium feel to interactions. There are no major software criticisms in early reviews, but the device is primarily intended for the Chinese market; buyers elsewhere should consider potential limitations in software optimization or connectivity bands when importing.
Camera Quality
The camera system is a triple 50MP setup with Leica branding, including a main lens (f/1.4, OIS), a periscope telephoto (5x optical zoom, OIS), and an ultrawide. The front houses a 32MP selfie camera. Reviewers describe the camera performance as consistent, with the Leica tuning delivering pleasant colors and ample detail in good light. However, a noted flaw is that facial texture processing can sometimes appear overly smoothed, which may disappoint users who prefer natural skin detail. Overall, the camera is capable and reliable but not class-leading—especially when compared to the best imaging flagships from other brands.
Battery Life
Battery life is arguably the Xiaomi 15S Pro’s strongest feature. It packs a 6100 mAh silicon-carbon cell, and in Wi-Fi battery tests it outperformed the previous generation Pro model, earning excellent endurance marks from reviewers. Charging is equally impressive: 90W wired and 50W wireless support gets you back up quickly. For users who prioritize all-day longevity, this device delivers confidently without compromise. The combination of large capacity and fast charging puts it among the best in its class.
Connectivity & Networking
The phone is well-equipped for modern connectivity, featuring Wi-Fi 7, Bluetooth 5.4, NFC, an infrared port, and UWB support. The IP68 rating adds peace of mind. However, because the device is primarily sold in China, connectivity bands and software features may not be fully compatible with networks in other regions. Buyers intending to import should verify local LTE/5G band support. Otherwise, the hardware set is top-tier for 2025.
Comparison with Alternatives
Compared to the standard Xiaomi 15 Pro, the 15S Pro is a variant that introduces the custom Xring O1 SoC and an optional carbon-fiber design, while keeping most other hardware identical. The main difference lies in performance character: the Xring O1 offers promising efficiency (contributing to excellent battery life) but suffers from thermal throttling under sustained gaming, whereas the Snapdragon 8 Elite-powered 15 Pro has a more established thermal profile. In the broader premium Android landscape, the 15S Pro’s battery endurance and display quality compete well, but its speaker performance and camera smoothing issues hold it back. Buyers deciding between the two Xiaomi models should weigh the novelty of the in-house chip against its current thermal limitations.
Pros and Cons
| Pros | Cons |
|---|---|
| Excellent battery life | Thermal throttling under sustained gaming loads |
| High-quality, bright LTPO AMOLED display | Underwhelming speaker performance |
| Premium build quality, especially the fiber edition | Over-smoothing of facial textures in some camera modes |
| Fast wired and wireless charging | Limited availability outside of China |
| Reintroduction of UWB for ecosystem integration |
Final Conclusion
The Xiaomi 15S Pro is a bold step for Xiaomi, showcasing its in-house Xring O1 chipset and delivering standout battery life alongside a gorgeous display. It feels premium and distinct, especially in the fiber edition. Yet it’s not without trade-offs: gamers will encounter heat throttling, audiophiles may be disappointed by the speakers, and camera processing occasionally over-smooths faces. If you prioritize all-day endurance and want to support Xiaomi’s silicon independence, this is a fantastic choice. For those seeking the most polished gaming or camera performance, a more mature flagship may suit better. Buy outside China with caution regarding network compatibility.
