According to a report from blogger “more，” the Xiaomi 15S Pro has achieved sales of over one hundred thousand units. While this figure may not meet every user’s expectation， it aligns with Xiaomi’s internal projections， and most variants are reportedly sold out.
The device was initially available in two color options and two storage configurations. Currently， only the Sky Blue 16GB+512GB variant remains in stock on the official Xiaomi website and JD.com.
This stock scarcity suggests a potential supply constraint， which could explain why several versions of the Xiaomi 15S Pro are unavailable. This situation directly relates to the deployment of Xiaomi’s in-house “Xuanjie O1” chip. Previously， Xiaomi had explained the absence of the Xuanjie O1 in the MIX Flip 2 by stating that its initial production volume was limited and insufficient for large-scale deployment in foldable devices. The current situation with the 15S Pro seems to confirm that the Xuanjie O1’s production capacity is a key limiting factor， potentially leading to the phasing out of certain configurations of the 15S Pro.
The strong market reception of the Xiaomi 15S Pro serves as a significant confidence booster for Xiaomi’s self-developed chip initiatives. This success validates the company’s investment and strategic direction in pursuing in-house silicon capabilities.
The Xiaomi 15S Pro marks the debut of the company’s proprietary 3nm “Xuanjie O1” chip， manufactured using TSMC’s second-generation 3nm process. This advanced chip integrates 19 billion transistors and features a 10-core CPU architecture. At its core， it utilizes Arm’s latest Cortex-X925 ultra-large core， clocked at an impressive 3.9GHz， designed to deliver rapid burst performance for tasks like application startup. The graphics processing is handled by the latest generation Immortalis-G925 GPU with a substantial 16-core configuration. In benchmark tests， the Xuanjie O1 has achieved AnTuTu scores of up to 3 million points， placing it directly in competition with top-tier flagship processors from industry leaders like Apple and Qualcomm.
Xiaomi’s commitment to the development of the Xuanjie O1 is evident in its substantial financial investment. As of April 2025， the cumulative R&D expenditure for the Xuanjie project has exceeded 13.5 billion RMB， with a dedicated research team of over 2，500 professionals. The company anticipates further R&D investment to surpass 6 billion RMB in 2025 alone. This large-scale investment underscores Xiaomi’s long-term vision for developing its own chip technology.
Earlier， Lei Jun， CEO of Xiaomi， articulated the ambitious goals set at the inception of the Xuanjie project: to achieve the latest manufacturing process nodes， flagship-level transistor density， and leading performance and power efficiency. To this end， Xiaomi has established a sustained， long-term investment strategy， committing to at least ten years of development and a minimum investment of 50 billion RMB， aiming for steady and incremental progress.
