OnePlus Ace 6 Ultra vs Xiaomi 18 Pro Max
The OnePlus Ace 6 Ultra (2026) runs on the MediaTek Dimensity 9500, while the Xiaomi 18 Pro Max (2026) runs on the Qualcomm Snapdragon 8 Elite Extreme Gen 6; launch prices were $555 and $986. By overall MobileRank rating, the Xiaomi 18 Pro Max leads — 92/100 vs 74/100 (a 18-point difference). Key differences: the OnePlus Ace 6 Ultra has the bigger battery (8600 mAh vs 8500); the main camera is 50 MP vs 200 MP; the Xiaomi 18 Pro Max is faster in AnTuTu (5,001,234 vs 3,429,868); the OnePlus Ace 6 Ultra is noticeably lighter (217g vs 235g).
Profile comparison
Category scores
OnePlus Ace 6 Ultra
Xiaomi 18 Pro Max
What makes OnePlus Ace 6 Ultra better?
- Bigger battery: 8600 vs 8500 mAh
- Faster charging: 120W vs 100W
- Higher refresh rate: 165Hz vs 120Hz
- Lighter: 217g vs 235g
- Cheaper at launch: $555 vs $986
- Better display (94/100 vs 82/100)
- Better portability (43/100 vs 33/100)
What makes Xiaomi 18 Pro Max better?
- Higher AnTuTu: 5001234 vs 3429868
- Better Geekbench Single: 4327 vs 3352
- Better Geekbench Multi: 12873 vs 10402
- Better main camera: 200MP vs 50MP
- Higher performance (100/100 vs 94/100)
- Better camera (100/100 vs 35/100)
- Longer battery life (92/100 vs 82/100)
Comparison verdict
Comparing the OnePlus Ace 6 Ultra vs the Xiaomi 18 Pro Max, the Xiaomi 18 Pro Max scores 18 points higher (92/100 vs 74/100). In the "camera" category, the Xiaomi 18 Pro Max leads (100/100 vs 35/100). In the "battery" category, the Xiaomi 18 Pro Max leads (92/100 vs 82/100). Value score: OnePlus Ace 6 Ultra — 66/100, Xiaomi 18 Pro Max — 96/100; 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 Xiaomi 18 Pro Max is a bit better (100/100 vs 94/100). In the "display" category, the OnePlus Ace 6 Ultra is a bit better (94/100 vs 82/100). In the "camera" category, the Xiaomi 18 Pro Max significantly outperforms the OnePlus Ace 6 Ultra (100/100 vs 35/100). In the "battery" category, the Xiaomi 18 Pro Max is a bit better (92/100 vs 82/100). In the "portability" category, the OnePlus Ace 6 Ultra is a bit better (43/100 vs 33/100).
Specs comparison
| Specification | OnePlus Ace 6 Ultra | Xiaomi 18 Pro Max | |
|---|---|---|---|
| Processor | MediaTek Dimensity 9500 | Qualcomm Snapdragon 8 Elite Extreme Gen 6 | |
| AnTuTu | 3429868 | 5001234 | |
| Geekbench Single | 3352 | 4327 | |
| Geekbench Multi | 10402 | 12873 | |
| Display | 6.8" AMOLED | 6.9" LTPO AMOLED | |
| Resolution | 1272x2772 | 1208x2624 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8600 mAh | 8500 mAh | |
| Charging | 120W | 100W | |
| Wireless charging | 0W | 50W | |
| Main camera | 50 MP | 200 MP | |
| Ultrawide | 8 MP | 50 MP | |
| Telephoto | 0 MP | 200 MP | |
| Front camera | 16 MP | 50 MP | |
| RAM | 12GB / 16GB | 12GB / 16GB | |
| Storage | 256GB / 512GB / 1TB | 256GB / 512GB / 1TB | |
| OS | Android 16 | Android 17 | |
| Brightness (peak) | 1800 nits | 4000 nits | |
| NFC | yes | yes | |
| Protection | IP66 | IP68/IP69 | |
| Dimensions | 162.5×77.5×8.5 mm | 163.4×77.6×8.4 mm | |
| Weight | 217 g | 235 g | |
| Launch price | $555 | $986 |
Camera comparison
OnePlus Ace 6 Ultra
- Main: 50MP f/1.8
- Ultrawide: 8MP
- Front: 16MP
Xiaomi 18 Pro Max
- Main: 200MP f/1.7
- Ultrawide: 50MP
- Telephoto: 200MP
- Front: 50MP
Display comparison
OnePlus Ace 6 Ultra
- 6.8" AMOLED
- Resolution: 1272x2772
- Refresh rate: 165 Hz
Xiaomi 18 Pro Max
- 6.9" LTPO AMOLED
- Resolution: 1208x2624
- Refresh rate: 120 Hz
Battery and charging
OnePlus Ace 6 Ultra
- 8600 mAh
- Wired: 120W
- No wireless charging
Xiaomi 18 Pro Max
- 8500 mAh
- Wired: 100W
- Wireless: 50W
Overall performance score
We compared OnePlus Ace 6 Ultra and Xiaomi 18 Pro Max, covering their specs and all relevant benchmarks.
Xiaomi 18 Pro Max leads OnePlus Ace 6 Ultra by 31.4% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $431. OnePlus Ace 6 Ultra was $431 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Xiaomi 18 Pro Max is a bit better (100/100 vs 94/100).
display
In the "display" category, the OnePlus Ace 6 Ultra is a bit better (94/100 vs 82/100).
camera
In the "camera" category, the Xiaomi 18 Pro Max significantly outperforms the OnePlus Ace 6 Ultra (100/100 vs 35/100).
battery
In the "battery" category, the Xiaomi 18 Pro Max is a bit better (92/100 vs 82/100).
portability
In the "portability" category, the OnePlus Ace 6 Ultra is a bit better (43/100 vs 33/100).
Frequently asked questions
Which is better: the OnePlus Ace 6 Ultra or the Xiaomi 18 Pro Max?
The Xiaomi 18 Pro Max is noticeably better than the OnePlus Ace 6 Ultra — the overall rating gap is 18 points.
What is the rating of the OnePlus Ace 6 Ultra and the Xiaomi 18 Pro Max?
The OnePlus Ace 6 Ultra has a MobileRank rating of 74/100, the Xiaomi 18 Pro Max — 92/100.
Which has the better camera: the OnePlus Ace 6 Ultra or the Xiaomi 18 Pro Max?
The Xiaomi 18 Pro Max leads on camera score (100/100 vs 35/100).
Which is more powerful: the OnePlus Ace 6 Ultra or the Xiaomi 18 Pro Max?
The Xiaomi 18 Pro Max leads on performance (100/100 vs 94/100).
Should you choose the OnePlus Ace 6 Ultra over the Xiaomi 18 Pro Max?
The OnePlus Ace 6 Ultra is a better fit for gamers and power users, those who care about battery life. The Xiaomi 18 Pro Max is a better fit for gamers and power users, mobile photography enthusiasts, those who care about battery life, budget-conscious buyers.