A new mystery smartphone from OnePlus is reportedly in development, powered by MediaTek's flagship Dimensity 9500 chipset, according to a reliable tipster on Weibo known as Digital Chat Station. The device is described as a performance-focused handset featuring high-end hardware and advanced cooling technology, positioning it as a potential gaming-centric offering. While the exact model name remains unconfirmed, speculation from tech publication Gizmochina points to it being the OnePlus Ace 6 Ultra, a high-spec variant in OnePlus's popular Ace series primarily targeted at the Chinese market.
The purported prototype is said to sport a 6.78-inch 1.5K LTPS flat OLED display with large, rounded corners and an impressive 165 Hz refresh rate. This refresh rate matches that of the flagship OnePlus 15 as well as the recently launched OnePlus Turbo 6 and Turbo 6V models, ensuring smooth visuals for gaming and multimedia consumption. Additionally, the handset is tipped to include an ultrasonic in-display fingerprint sensor for faster and more secure biometric authentication, along with custom performance tuning to optimize speed and efficiency.
Battery life appears to be a major highlight of the device. The tipster reports that the current testing unit features an 8,000 mAh-class battery, but internal expectations at OnePlus could push this even further to a 9,000 mAh-class capacity. Such a large battery, if realized, would represent one of the biggest cells in a flagship or near-flagship Android smartphone, potentially offering exceptional endurance for heavy users and gamers. To manage heat during prolonged high-performance sessions, the phone may incorporate an active cooling fan—a feature increasingly seen in gaming-focused devices to sustain peak performance without throttling.
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The development comes shortly after OnePlus introduced the Turbo 6 and Turbo 6V in China, marking the company's first smartphone launches of 2026. Both models are equipped with Snapdragon chipsets and share the same 165 Hz display technology, suggesting OnePlus is pushing aggressively in the high-refresh-rate and performance segments. The mystery handset, if it indeed launches as the Ace 6 Ultra, could serve as a more powerful sibling in the lineup, targeting enthusiasts who prioritize raw power, extended battery life, and thermal management.
While details remain speculative at this stage, the combination of the Dimensity 9500 chipset, a massive battery, and advanced cooling hints at OnePlus's intent to compete strongly in the premium mid-range and gaming smartphone categories in 2026. Further leaks or official announcements are expected in the coming months as testing progresses.
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