Between the ThinkPhone and Xiaomi 15 Ultra, the ThinkPhone comes out ahead in weight and refresh rate, while the Xiaomi 15 Ultra wins on wireless charging and antutu. Overall, the ThinkPhone scores 64.6 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 9.2 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 ThinkPhone 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, refresh rate.
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, ram, among others.
Both ship with comparable main camera, 5g support, water resistance, 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 Motorola - ThinkPhone wins
- ▲Weight — 40.00 g less. 189 vs 229.
- ▲Refresh rate — 20.00% more. 144 Hz vs 120 Hz.
Why Xiaomi 15 Ultra wins
- ▲Wireless charging — 433.33% more. 80 W vs 15 W.
- ▲AnTuTu — 126.67% more. 2720000 vs 1200000.
- ▲RAM — 100.00% more. 16 GB vs 8 GB.
- ▲Wired charging — 32.35% more. 90 W vs 68 W.
- ▲Pixel density — 29.85% more. 522 ppi vs 402 ppi.
- ▲Battery capacity — 20.00% more. 6000 mAh vs 5000 mAh.
- ▲Screen size — 1.97% more. 6.73 " vs 6.6 ".
- ▲Promised OS updates: 4 (vs 3).
Spec comparison
Design
| Spec | Motorola - ThinkPhone | Xiaomi 15 Ultra |
|---|---|---|
| Weight | 189 glead | 229 g |
| Thickness | 8.3 mmlead | 9.4 mm |
| Water resistanceⓘ | IP68 | IP68 |
| Form factor | bar | bar |
Display
| Spec | Motorola - ThinkPhone | Xiaomi 15 Ultra |
|---|---|---|
| Screen sizeⓘ | 6.6 " | 6.73 "lead |
| Pixel densityⓘ | 402 ppi | 522 ppilead |
| Refresh rateⓘ | 144 Hzlead | 120 Hz |
| Peak brightnessⓘ | 1200 nits | 3200 nitslead |
Performance
Cameras
| Spec | Motorola - ThinkPhone | Xiaomi 15 Ultra |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Motorola - ThinkPhone | Xiaomi 15 Ultra |
|---|---|---|
| Battery capacity | 5000 mAh | 6000 mAhlead |
| Wired chargingⓘ | 68 W | 90 Wlead |
| Wireless chargingⓘ | 15 W | 80 Wlead |
Connectivity
| Spec | Motorola - ThinkPhone | Xiaomi 15 Ultra |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Motorola - ThinkPhone | Xiaomi 15 Ultra |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 3 years | 4 yearslead |
Frequently asked
Which has better battery, ThinkPhone or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has 20.0% more battery — 5000 mAh vs 6000 mAh.
Which is lighter, ThinkPhone or Xiaomi 15 Ultra?+
ThinkPhone is 40g lighter — 189g vs 229g.
Is ThinkPhone waterproof?+
ThinkPhone has an IP68 rating.
Does Xiaomi 15 Ultra support 5G?+
Yes, Xiaomi 15 Ultra supports 5G.
Which has more RAM, ThinkPhone or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra offers 16GB of RAM.
Which has a better camera, ThinkPhone or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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