Between the CMF Phone 1 and Xiaomi 15 Ultra, the CMF Phone 1 comes out ahead in weight, while the Xiaomi 15 Ultra wins on antutu and wired charging. Overall, the CMF Phone 1 scores 61.4 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 12.4 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 CMF Phone 1 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 antutu, 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 - CMF Phone 1 wins
- ▲Weight — 32.00 g less. 197 vs 229.
Why Xiaomi 15 Ultra wins
- ▲AnTuTu — 385.71% more. 2720000 vs 560000.
- ▲Wired charging — 172.73% more. 90 W vs 33 W.
- ▲RAM — 100.00% more. 16 GB vs 8 GB.
- ▲Front camera — 100.00% more. 32 MP vs 16 MP.
- ▲Pixel density — 32.15% more. 522 ppi vs 395 ppi.
- ▲Battery capacity — 20.00% more. 6000 mAh vs 5000 mAh.
- ▲Has Optical image stabilization.
- ▲Screen size — 0.90% more. 6.73 " vs 6.67 ".
Spec comparison
Design
| Spec | Nothing - CMF Phone 1 | Xiaomi 15 Ultra |
|---|---|---|
| Weight | 197 glead | 229 g |
| Thickness | 8.2 mmlead | 9.4 mm |
| Water resistanceⓘ | IP52 | IP68lead |
| Form factor | bar | bar |
Display
| Spec | Nothing - CMF Phone 1 | Xiaomi 15 Ultra |
|---|---|---|
| Screen sizeⓘ | 6.67 " | 6.73 "lead |
| Pixel densityⓘ | 395 ppi | 522 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 2000 nits | 3200 nitslead |
Performance
Cameras
| Spec | Nothing - CMF Phone 1 | Xiaomi 15 Ultra |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 16 MP | 32 MPlead |
| Optical image stabilizationⓘ | false | truelead |
Battery
| Spec | Nothing - CMF Phone 1 | Xiaomi 15 Ultra |
|---|---|---|
| Battery capacity | 5000 mAh | 6000 mAhlead |
| Wired chargingⓘ | 33 W | 90 Wlead |
| Wireless chargingⓘ | 0 W | 80 Wlead |
Connectivity
| Spec | Nothing - CMF Phone 1 | Xiaomi 15 Ultra |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | truelead | false |
Operating System
| Spec | Nothing - CMF Phone 1 | Xiaomi 15 Ultra |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 2 years | 4 yearslead |
Frequently asked
Which has better battery, CMF Phone 1 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has 20.0% more battery — 5000 mAh vs 6000 mAh.
Which is lighter, CMF Phone 1 or Xiaomi 15 Ultra?+
CMF Phone 1 is 32g lighter — 197g vs 229g.
Is CMF Phone 1 waterproof?+
CMF Phone 1 has an IP52 rating.
Does Xiaomi 15 Ultra support 5G?+
Yes, Xiaomi 15 Ultra supports 5G.
Which has more RAM, CMF Phone 1 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra offers 16GB of RAM.
Which has a better camera, CMF Phone 1 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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