Between the Phone (2) and Xiaomi 15 Ultra, the Phone (2) comes out ahead in weight, while the Xiaomi 15 Ultra wins on wireless charging and antutu. Overall, the Phone (2) scores 64.5 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 9.3 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 Phone (2) if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight.
Pick the Xiaomi 15 Ultra if you push the hardware — gaming, on-device AI, heavy multitasking — and the extra compute headroom is worth the trade-offs. Its strongest claims are wireless charging, antutu, wired charging, 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 Nothing - Phone (2) wins
- ▲Weight — 27.80 g less. 201.2 vs 229.
Why Xiaomi 15 Ultra wins
- ▲Wireless charging — 433.33% more. 80 W vs 15 W.
- ▲AnTuTu — 110.85% more. 2720000 vs 1290000.
- ▲Wired charging — 100.00% more. 90 W vs 45 W.
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Pixel density — 32.49% more. 522 ppi vs 394 ppi.
- ▲Battery capacity — 27.66% more. 6000 mAh vs 4700 mAh.
- ▲Water resistance: IP68 (vs IP54).
- ▲Promised OS updates: 4 (vs 3).
Spec comparison
Design
| Spec | Nothing - Phone (2) | Xiaomi 15 Ultra |
|---|---|---|
| Weight | 201.2 glead | 229 g |
| Thickness | 8.6 mmlead | 9.4 mm |
| Water resistanceⓘ | IP54 | IP68lead |
| Form factor | bar | bar |
Display
| Spec | Nothing - Phone (2) | Xiaomi 15 Ultra |
|---|---|---|
| Screen sizeⓘ | 6.7 " | 6.73 "lead |
| Pixel densityⓘ | 394 ppi | 522 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 1600 nits | 3200 nitslead |
Performance
Cameras
| Spec | Nothing - Phone (2) | Xiaomi 15 Ultra |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Nothing - Phone (2) | Xiaomi 15 Ultra |
|---|---|---|
| Battery capacity | 4700 mAh | 6000 mAhlead |
| Wired chargingⓘ | 45 W | 90 Wlead |
| Wireless chargingⓘ | 15 W | 80 Wlead |
Connectivity
| Spec | Nothing - Phone (2) | Xiaomi 15 Ultra |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Nothing - Phone (2) | Xiaomi 15 Ultra |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 3 years | 4 yearslead |
Frequently asked
Which has better battery, Phone (2) or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has 27.7% more battery — 4700 mAh vs 6000 mAh.
Which is lighter, Phone (2) or Xiaomi 15 Ultra?+
Phone (2) is 28g lighter — 201.2g vs 229g.
Is Phone (2) waterproof?+
Phone (2) has an IP54 rating.
Does Xiaomi 15 Ultra support 5G?+
Yes, Xiaomi 15 Ultra supports 5G.
Which has more RAM, Phone (2) or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra offers 16GB of RAM.
Which has a better camera, Phone (2) or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has a 50 MP main camera vs 50 MP.
Spec-level deep dives
More from the same brands
vsMars is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no extra cost to you. Learn more.