Between the Nord 4 and Xiaomi 15 Ultra, the Nord 4 comes out ahead in weight and wired charging, while the Xiaomi 15 Ultra wins on antutu and front camera. Overall, the Nord 4 scores 65.8 and the Xiaomi 15 Ultra scores 73.8 on our Mars Score.
Which should you buy?
The Xiaomi 15 Ultra is the clear pick on raw spec strength, leading by 8.0 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Nord 4 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are weight, wired charging, screen size.
Pick the Xiaomi 15 Ultra if you photograph or shoot video regularly and want the better imaging pipeline of the two. Its strongest claims are antutu, front camera, ram, among others.
Both ship with comparable main camera, refresh rate, 5g support, so those specs don't separate the two — focus on the differences below.
Bottom line: the Xiaomi 15 Ultra is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why OnePlus - Nord 4 wins
- ▲Weight — 29.50 g less. 199.5 vs 229.
- ▲Wired charging — 11.11% more. 100 W vs 90 W.
- ▲Screen size — 0.15% more. 6.74 " vs 6.73 ".
Why Xiaomi 15 Ultra wins
- ▲AnTuTu — 151.85% more. 2720000 vs 1080000.
- ▲Front camera — 100.00% more. 32 MP vs 16 MP.
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Pixel density — 16.00% more. 522 ppi vs 450 ppi.
- ▲Battery capacity — 9.09% more. 6000 mAh vs 5500 mAh.
- ▲Water resistance: IP68 (vs IP65).
- ▲Wireless charging: 80 W vs 0 W.
Spec comparison
Design
| Spec | OnePlus - Nord 4 | Xiaomi 15 Ultra |
|---|---|---|
| Weight | 199.5 glead | 229 g |
| Thickness | 8.0 mmlead | 9.4 mm |
| Water resistanceⓘ | IP65 | IP68lead |
| Form factor | bar | bar |
Display
| Spec | OnePlus - Nord 4 | Xiaomi 15 Ultra |
|---|---|---|
| Screen sizeⓘ | 6.74 "lead | 6.73 " |
| Pixel densityⓘ | 450 ppi | 522 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 2150 nits | 3200 nitslead |
Performance
Cameras
| Spec | OnePlus - Nord 4 | Xiaomi 15 Ultra |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 16 MP | 32 MPlead |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | OnePlus - Nord 4 | Xiaomi 15 Ultra |
|---|---|---|
| Battery capacity | 5500 mAh | 6000 mAhlead |
| Wired chargingⓘ | 100 Wlead | 90 W |
| Wireless chargingⓘ | 0 W | 80 Wlead |
Connectivity
| Spec | OnePlus - Nord 4 | Xiaomi 15 Ultra |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | OnePlus - Nord 4 | Xiaomi 15 Ultra |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 4 years | 4 years |
Frequently asked
Which has better battery, Nord 4 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has 9.1% more battery — 5500 mAh vs 6000 mAh.
Which is lighter, Nord 4 or Xiaomi 15 Ultra?+
Nord 4 is 30g lighter — 199.5g vs 229g.
Is Nord 4 waterproof?+
Nord 4 has an IP65 rating.
Does Xiaomi 15 Ultra support 5G?+
Yes, Xiaomi 15 Ultra supports 5G.
Which has more RAM, Nord 4 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra offers 16GB of RAM.
Which has a better camera, Nord 4 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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