OnePlus Ace 6 Ultra vs Xiaomi Mi 9
The OnePlus Ace 6 Ultra (2026) runs on the MediaTek Dimensity 9500, while the Xiaomi Mi 9 (2019) runs on the Qualcomm Snapdragon 855; launch prices were $555 and $400. By overall MobileRank rating, the OnePlus Ace 6 Ultra leads — 74/100 vs 47/100 (a 27-point difference). Key differences: the OnePlus Ace 6 Ultra has the bigger battery (8600 mAh vs 3300); the main camera is 50 MP vs 48 MP; the OnePlus Ace 6 Ultra is faster in AnTuTu (3,429,868 vs 824,513); the Xiaomi Mi 9 is noticeably lighter (173g vs 217g).
Profile comparison
Category scores
OnePlus Ace 6 Ultra
Xiaomi Mi 9
What makes OnePlus Ace 6 Ultra better?
- Higher AnTuTu: 3429868 vs 824513
- Better Geekbench Single: 3293 vs 968
- Better Geekbench Multi: 10243 vs 2731
- Bigger battery: 8600 vs 3300 mAh
- Faster charging: 120W vs 27W
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 165Hz vs 60Hz
- Higher performance (94/100 vs 54/100)
- Longer battery life (82/100 vs 22/100)
- Better display (94/100 vs 56/100)
What makes Xiaomi Mi 9 better?
- Lighter: 173g vs 217g
- Cheaper at launch: $400 vs $555
- Better camera (44/100 vs 35/100)
- Better portability (79/100 vs 43/100)
Comparison verdict
Comparing the OnePlus Ace 6 Ultra vs the Xiaomi Mi 9, the OnePlus Ace 6 Ultra scores 27 points higher (74/100 vs 47/100). In the "performance" category, the OnePlus Ace 6 Ultra leads (94/100 vs 54/100). In the "battery" category, the OnePlus Ace 6 Ultra leads (82/100 vs 22/100). Value score: OnePlus Ace 6 Ultra — 66/100, Xiaomi Mi 9 — 22/100; 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 significantly outperforms the Xiaomi Mi 9 (94/100 vs 54/100). In the "display" category, the OnePlus Ace 6 Ultra significantly outperforms the Xiaomi Mi 9 (94/100 vs 56/100). In the "camera" category, the Xiaomi Mi 9 is a bit better (44/100 vs 35/100). In the "battery" category, the OnePlus Ace 6 Ultra significantly outperforms the Xiaomi Mi 9 (82/100 vs 22/100). In the "portability" category, the Xiaomi Mi 9 significantly outperforms the OnePlus Ace 6 Ultra (79/100 vs 43/100).
Specs comparison
| Specification | OnePlus Ace 6 Ultra | Xiaomi Mi 9 | |
|---|---|---|---|
| Processor | MediaTek Dimensity 9500 | Qualcomm Snapdragon 855 | |
| AnTuTu | 3429868 | 824513 | |
| Geekbench Single | 3293 | 968 | |
| Geekbench Multi | 10243 | 2731 | |
| Display | 6.8" AMOLED | 6.4" AMOLED | |
| Resolution | 1272x2772 | 2340x1080 | |
| Refresh rate | 165 Hz | 60 Hz | |
| Battery | 8600 mAh | 3300 mAh | |
| Charging | 120W | 27W | |
| Wireless charging | 0W | 20W | |
| Main camera | 50 MP | 48 MP | |
| Ultrawide | 8 MP | 16 MP | |
| Telephoto | 0 MP | 12 MP | |
| Front camera | 16 MP | 20 MP | |
| RAM | 12GB / 16GB | 6GB / 8GB | |
| Storage | 256GB / 512GB / 1TB | 64GB / 128GB | |
| OS | Android 16 | Android 9 | |
| Brightness (peak) | 1800 nits | — | |
| NFC | yes | yes | |
| Protection | IP66 | — | |
| Dimensions | 162.5×77.5×8.5 mm | 157.5×74.7×7.6 mm | |
| Weight | 217 g | 173 g | |
| Launch price | $555 | $400 |
Camera comparison
OnePlus Ace 6 Ultra
- Main: 50MP f/1.8
- Ultrawide: 8MP
- Front: 16MP
Xiaomi Mi 9
- Main: 48MP f/1.75
- Ultrawide: 16MP
- Telephoto: 12MP
- Front: 20MP
Display comparison
OnePlus Ace 6 Ultra
- 6.8" AMOLED
- Resolution: 1272x2772
- Refresh rate: 165 Hz
Xiaomi Mi 9
- 6.4" AMOLED
- Resolution: 2340x1080
- Refresh rate: 60 Hz
Battery and charging
OnePlus Ace 6 Ultra
- 8600 mAh
- Wired: 120W
- No wireless charging
Xiaomi Mi 9
- 3300 mAh
- Wired: 27W
- Wireless: 20W
Overall performance score
We compared OnePlus Ace 6 Ultra and Xiaomi Mi 9, covering their specs and all relevant benchmarks.
OnePlus Ace 6 Ultra leads Xiaomi Mi 9 by 316.0% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $155. Xiaomi Mi 9 was $155 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the OnePlus Ace 6 Ultra significantly outperforms the Xiaomi Mi 9 (94/100 vs 54/100).
display
In the "display" category, the OnePlus Ace 6 Ultra significantly outperforms the Xiaomi Mi 9 (94/100 vs 56/100).
camera
In the "camera" category, the Xiaomi Mi 9 is a bit better (44/100 vs 35/100).
battery
In the "battery" category, the OnePlus Ace 6 Ultra significantly outperforms the Xiaomi Mi 9 (82/100 vs 22/100).
portability
In the "portability" category, the Xiaomi Mi 9 significantly outperforms the OnePlus Ace 6 Ultra (79/100 vs 43/100).
Frequently asked questions
Which is better: the OnePlus Ace 6 Ultra or the Xiaomi Mi 9?
The OnePlus Ace 6 Ultra significantly outperforms the Xiaomi Mi 9 by 27 points (74/100 vs 47/100).
What is the rating of the OnePlus Ace 6 Ultra and the Xiaomi Mi 9?
The OnePlus Ace 6 Ultra has a MobileRank rating of 74/100, the Xiaomi Mi 9 — 47/100.
Which has the better camera: the OnePlus Ace 6 Ultra or the Xiaomi Mi 9?
The Xiaomi Mi 9 leads on camera score (44/100 vs 35/100).
Which is more powerful: the OnePlus Ace 6 Ultra or the Xiaomi Mi 9?
The OnePlus Ace 6 Ultra leads on performance (94/100 vs 54/100).
Should you choose the OnePlus Ace 6 Ultra over the Xiaomi Mi 9?
The OnePlus Ace 6 Ultra is a better fit for gamers and power users, those who care about battery life.