OnePlus 9 vs Xiaomi 18 Pro Max
The OnePlus 9 (2021) runs on the Qualcomm Snapdragon 888, while the Xiaomi 18 Pro Max (2026) runs on the Qualcomm Snapdragon 8 Elite Extreme Gen 6; launch prices were $729 and $986. By overall MobileRank rating, the Xiaomi 18 Pro Max leads — 92/100 vs 60/100 (a 32-point difference). Key differences: the Xiaomi 18 Pro Max has the bigger battery (8500 mAh vs 4500); the main camera is 48 MP vs 200 MP; the Xiaomi 18 Pro Max is faster in AnTuTu (5,001,234 vs 1,157,244); the OnePlus 9 is noticeably lighter (192g vs 235g).
Profile comparison
Category scores
OnePlus 9
Xiaomi 18 Pro Max
What makes OnePlus 9 better?
- Lighter: 192g vs 235g
- Cheaper at launch: $729 vs $986
- Better portability (56/100 vs 33/100)
What makes Xiaomi 18 Pro Max better?
- Higher AnTuTu: 5001234 vs 1157244
- Better Geekbench Single: 4327 vs 1500
- Better Geekbench Multi: 12873 vs 3537
- Bigger battery: 8500 vs 4500 mAh
- Faster charging: 100W vs 65W
- Better main camera: 200MP vs 48MP
- Faster wireless charging: 50W vs 15W
- Higher performance (100/100 vs 64/100)
- Better camera (100/100 vs 51/100)
- Longer battery life (92/100 vs 50/100)
- Better display (82/100 vs 80/100)
Comparison verdict
Comparing the OnePlus 9 vs the Xiaomi 18 Pro Max, the Xiaomi 18 Pro Max scores 32 points higher (92/100 vs 60/100). In the "performance" category, the Xiaomi 18 Pro Max leads (100/100 vs 64/100). In the "camera" category, the Xiaomi 18 Pro Max leads (100/100 vs 51/100). In the "battery" category, the Xiaomi 18 Pro Max leads (92/100 vs 50/100). Value score: OnePlus 9 — 34/100, 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 significantly outperforms the OnePlus 9 (100/100 vs 64/100). In the "display" category, the Xiaomi 18 Pro Max and the OnePlus 9 are nearly equal (82/100 vs 80/100). In the "camera" category, the Xiaomi 18 Pro Max significantly outperforms the OnePlus 9 (100/100 vs 51/100). In the "battery" category, the Xiaomi 18 Pro Max significantly outperforms the OnePlus 9 (92/100 vs 50/100). In the "portability" category, the OnePlus 9 notably outperforms the Xiaomi 18 Pro Max (56/100 vs 33/100).
Specs comparison
| Specification | OnePlus 9 | Xiaomi 18 Pro Max | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 888 | Qualcomm Snapdragon 8 Elite Extreme Gen 6 | |
| AnTuTu | 1157244 | 5001234 | |
| Geekbench Single | 1500 | 4327 | |
| Geekbench Multi | 3537 | 12873 | |
| Display | 6.5" AMOLED | 6.9" LTPO AMOLED | |
| Resolution | 2400x1080 | 1208x2624 | |
| Refresh rate | 120 Hz | 120 Hz | |
| Battery | 4500 mAh | 8500 mAh | |
| Charging | 65W | 100W | |
| Wireless charging | 15W | 50W | |
| Main camera | 48 MP | 200 MP | |
| Ultrawide | 50 MP | 50 MP | |
| Telephoto | 0 MP | 200 MP | |
| Front camera | 16 MP | 50 MP | |
| RAM | 8GB / 12GB | 12GB / 16GB | |
| Storage | 128GB / 256GB | 256GB / 512GB / 1TB | |
| OS | Android 11 | Android 17 | |
| Brightness (peak) | 1100 nits | 4000 nits | |
| NFC | yes | yes | |
| Protection | — | IP68/IP69 | |
| Dimensions | 160.0×74.2×8.7 mm | 163.4×77.6×8.4 mm | |
| Weight | 192 g | 235 g | |
| Launch price | $729 | $986 |
Camera comparison
OnePlus 9
- Main: 48MP f/1.8
- Ultrawide: 50MP
- Front: 16MP
Xiaomi 18 Pro Max
- Main: 200MP f/1.7
- Ultrawide: 50MP
- Telephoto: 200MP
- Front: 50MP
Display comparison
OnePlus 9
- 6.5" AMOLED
- Resolution: 2400x1080
- Refresh rate: 120 Hz
Xiaomi 18 Pro Max
- 6.9" LTPO AMOLED
- Resolution: 1208x2624
- Refresh rate: 120 Hz
Battery and charging
OnePlus 9
- 4500 mAh
- Wired: 65W
- Wireless: 15W
Xiaomi 18 Pro Max
- 8500 mAh
- Wired: 100W
- Wireless: 50W
Overall performance score
We compared OnePlus 9 and Xiaomi 18 Pro Max, covering their specs and all relevant benchmarks.
Xiaomi 18 Pro Max leads OnePlus 9 by 76.9% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $257. OnePlus 9 was $257 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Xiaomi 18 Pro Max significantly outperforms the OnePlus 9 (100/100 vs 64/100).
display
In the "display" category, the Xiaomi 18 Pro Max and the OnePlus 9 are nearly equal (82/100 vs 80/100).
camera
In the "camera" category, the Xiaomi 18 Pro Max significantly outperforms the OnePlus 9 (100/100 vs 51/100).
battery
In the "battery" category, the Xiaomi 18 Pro Max significantly outperforms the OnePlus 9 (92/100 vs 50/100).
portability
In the "portability" category, the OnePlus 9 notably outperforms the Xiaomi 18 Pro Max (56/100 vs 33/100).
Frequently asked questions
Which is better: the OnePlus 9 or the Xiaomi 18 Pro Max?
The Xiaomi 18 Pro Max significantly outperforms the OnePlus 9 by 32 points (92/100 vs 60/100).
What is the rating of the OnePlus 9 and the Xiaomi 18 Pro Max?
The OnePlus 9 has a MobileRank rating of 60/100, the Xiaomi 18 Pro Max — 92/100.
Which has the better camera: the OnePlus 9 or the Xiaomi 18 Pro Max?
The Xiaomi 18 Pro Max leads on camera score (100/100 vs 51/100).
Which is more powerful: the OnePlus 9 or the Xiaomi 18 Pro Max?
The Xiaomi 18 Pro Max leads on performance (100/100 vs 64/100).
Should you choose the OnePlus 9 over the Xiaomi 18 Pro Max?
The OnePlus 9 is a better fit for active users. 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.