OnePlus Ace 6 Ultra vs Xiaomi 15
The OnePlus Ace 6 Ultra (2026) runs on the MediaTek Dimensity 9500, while the Xiaomi 15 (2025) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $555 and $635. By overall MobileRank rating, the Xiaomi 15 leads — 82/100 vs 74/100 (a 8-point difference). Key differences: the OnePlus Ace 6 Ultra has the bigger battery (8600 mAh vs 5240); the OnePlus Ace 6 Ultra is faster in AnTuTu (3,429,868 vs 2,914,100); the Xiaomi 15 is noticeably lighter (191g vs 217g).
Profile comparison
Category scores
OnePlus Ace 6 Ultra
Xiaomi 15
What makes OnePlus Ace 6 Ultra better?
- Higher AnTuTu: 3429868 vs 2914100
- Better Geekbench Single: 3352 vs 3092
- Better Geekbench Multi: 10402 vs 9147
- Bigger battery: 8600 vs 5240 mAh
- Faster charging: 120W vs 90W
- Higher refresh rate: 165Hz vs 120Hz
- Cheaper at launch: $555 vs $635
- Higher performance (94/100 vs 91/100)
- Longer battery life (82/100 vs 77/100)
- Better display (94/100 vs 85/100)
What makes Xiaomi 15 better?
- Lighter: 191g vs 217g
- Better camera (78/100 vs 35/100)
- Better portability (60/100 vs 43/100)
Comparison verdict
Comparing the OnePlus Ace 6 Ultra vs the Xiaomi 15, the Xiaomi 15 scores 8 points higher (82/100 vs 74/100). In the "camera" category, the Xiaomi 15 leads (78/100 vs 35/100). Value score: OnePlus Ace 6 Ultra — 66/100, Xiaomi 15 — 78/100; it shows how far a model sits above or below the usual level for its price, and is not part of the overall rating. In the "performance" category, the OnePlus Ace 6 Ultra and the Xiaomi 15 are nearly equal (94/100 vs 91/100). In the "display" category, the OnePlus Ace 6 Ultra is a bit better (94/100 vs 85/100). In the "camera" category, the Xiaomi 15 significantly outperforms the OnePlus Ace 6 Ultra (78/100 vs 35/100). In the "battery" category, the OnePlus Ace 6 Ultra is a bit better (82/100 vs 77/100). In the "portability" category, the Xiaomi 15 notably outperforms the OnePlus Ace 6 Ultra (60/100 vs 43/100).
Specs comparison
| Specification | OnePlus Ace 6 Ultra | Xiaomi 15 | |
|---|---|---|---|
| Processor | MediaTek Dimensity 9500 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 3429868 | 2914100 | |
| Geekbench Single | 3352 | 3092 | |
| Geekbench Multi | 10402 | 9147 | |
| Display | 6.8" AMOLED | 6.4" LTPO AMOLED | |
| Resolution | 1272x2772 | 2670x1200 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8600 mAh | 5240 mAh | |
| Charging | 120W | 90W | |
| Wireless charging | 0W | 50W | |
| DXOMark (camera) | — | 147 | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 8 MP | 50 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 16 MP | 32 MP | |
| RAM | 12GB / 16GB | 12GB / 16GB | |
| Storage | 256GB / 512GB / 1TB | 256GB / 512GB / 1TB | |
| OS | Android 16 | Android 15 / HyperOS 2 | |
| Brightness (peak) | 1800 nits | 3200 nits | |
| NFC | yes | yes | |
| Protection | IP66 | IP68 | |
| Dimensions | 162.5×77.5×8.5 mm | 152.3×71.2×8.4 mm | |
| Weight | 217 g | 191 g | |
| Launch price | $555 | $635 |
Camera comparison
OnePlus Ace 6 Ultra
- Main: 50MP f/1.8
- Ultrawide: 8MP
- Front: 16MP
Xiaomi 15
- Main: 50MP f/1.6
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Display comparison
OnePlus Ace 6 Ultra
- 6.8" AMOLED
- Resolution: 1272x2772
- Refresh rate: 165 Hz
Xiaomi 15
- 6.4" LTPO AMOLED
- Resolution: 2670x1200
- Refresh rate: 120 Hz
Battery and charging
OnePlus Ace 6 Ultra
- 8600 mAh
- Wired: 120W
- No wireless charging
Xiaomi 15
- 5240 mAh
- NanoReview test: web browsing 13:20 hrs, total 31:54 hrs
- Wired: 90W
- Wireless: 50W
Overall performance score
We compared OnePlus Ace 6 Ultra and Xiaomi 15, covering their specs and all relevant benchmarks.
OnePlus Ace 6 Ultra leads Xiaomi 15 by 17.7% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $80. OnePlus Ace 6 Ultra was $80 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the OnePlus Ace 6 Ultra and the Xiaomi 15 are nearly equal (94/100 vs 91/100).
display
In the "display" category, the OnePlus Ace 6 Ultra is a bit better (94/100 vs 85/100).
camera
In the "camera" category, the Xiaomi 15 significantly outperforms the OnePlus Ace 6 Ultra (78/100 vs 35/100).
battery
In the "battery" category, the OnePlus Ace 6 Ultra is a bit better (82/100 vs 77/100).
portability
In the "portability" category, the Xiaomi 15 notably outperforms the OnePlus Ace 6 Ultra (60/100 vs 43/100).
Frequently asked questions
Which is better: the OnePlus Ace 6 Ultra or the Xiaomi 15?
The Xiaomi 15 edges out the OnePlus Ace 6 Ultra by just 8 points — the two devices are very close in overall level.
What is the rating of the OnePlus Ace 6 Ultra and the Xiaomi 15?
The OnePlus Ace 6 Ultra has a MobileRank rating of 74/100, the Xiaomi 15 — 82/100.
Which has the better camera: the OnePlus Ace 6 Ultra or the Xiaomi 15?
The Xiaomi 15 leads on camera score (78/100 vs 35/100).
Should you choose the OnePlus Ace 6 Ultra over the Xiaomi 15?
The OnePlus Ace 6 Ultra is a better fit for gamers and power users, those who care about battery life. The Xiaomi 15 is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.