Between the Phone (3) and Xiaomi 15 Ultra, the Phone (3) comes out ahead in weight and promised os updates, while the Xiaomi 15 Ultra wins on wireless charging and wired charging. Overall, the Phone (3) scores 68.7 and the Xiaomi 15 Ultra scores 73.8 on our Mars Score.
Which should you buy?
The Xiaomi 15 Ultra edges ahead on the Mars Score (68.7 vs 73.8), but the 5.1-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Phone (3) if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight, promised os updates.
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, wired charging, 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 Nothing - Phone (3) wins
- ▲Weight — 33.00 g less. 196 vs 229.
- ▲Promised OS updates: 5 (vs 4).
Why Xiaomi 15 Ultra wins
- ▲Wireless charging — 433.33% more. 80 W vs 15 W.
- ▲Wired charging — 38.46% more. 90 W vs 65 W.
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲AnTuTu — 32.68% more. 2720000 vs 2050000.
- ▲Battery capacity — 16.50% more. 6000 mAh vs 5150 mAh.
- ▲Pixel density — 13.48% more. 522 ppi vs 460 ppi.
- ▲Screen size — 0.45% more. 6.73 " vs 6.7 ".
Spec comparison
Design
| Spec | Nothing - Phone (3) | Xiaomi 15 Ultra |
|---|---|---|
| Weight | 196 glead | 229 g |
| Thickness | 8.4 mmlead | 9.4 mm |
| Water resistanceⓘ | IP68 | IP68 |
| Form factor | bar | bar |
Display
| Spec | Nothing - Phone (3) | Xiaomi 15 Ultra |
|---|---|---|
| Screen sizeⓘ | 6.7 " | 6.73 "lead |
| Pixel densityⓘ | 460 ppi | 522 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 4500 nitslead | 3200 nits |
Performance
Cameras
| Spec | Nothing - Phone (3) | Xiaomi 15 Ultra |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Nothing - Phone (3) | Xiaomi 15 Ultra |
|---|---|---|
| Battery capacity | 5150 mAh | 6000 mAhlead |
| Wired chargingⓘ | 65 W | 90 Wlead |
| Wireless chargingⓘ | 15 W | 80 Wlead |
Connectivity
| Spec | Nothing - Phone (3) | Xiaomi 15 Ultra |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Nothing - Phone (3) | Xiaomi 15 Ultra |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 5 yearslead | 4 years |
Frequently asked
Which has better battery, Phone (3) or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has 16.5% more battery — 5150 mAh vs 6000 mAh.
Which is lighter, Phone (3) or Xiaomi 15 Ultra?+
Phone (3) is 33g lighter — 196g vs 229g.
Is Phone (3) waterproof?+
Phone (3) has an IP68 rating.
Does Xiaomi 15 Ultra support 5G?+
Yes, Xiaomi 15 Ultra supports 5G.
Which has more RAM, Phone (3) or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra offers 16GB of RAM.
Which has a better camera, Phone (3) or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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