Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Xiaomi 15 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Front camera | 32 MP | 20 MP |
| Wired charging | 90 W | 67 W |
| Weight | 192 g | 226 g |
| RAM | 12 GB | 16 GB |
| AnTuTu | 2680000 | 2040000 |
| Screen size | 6.36 " | 7.98 " |
Between the Xiaomi 15 and MIX Fold 4, the Xiaomi 15 comes out ahead in front camera / wired charging, while the MIX Fold 4 wins on ram / screen size. Overall, the Xiaomi 15 scores 69.8 and the MIX Fold 4 scores 69.5 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (69.8 vs 69.5). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Xiaomi 15 if you photograph or shoot video regularly and want the better imaging pipeline of the two. The biggest gaps in its favor are front camera, wired charging, weight, among others. The single most decisive one: Front camera — 60.00% more. 32 MP vs 20 MP.
Pick the MIX Fold 4 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are ram, screen size, water resistance. The single most decisive one: RAM — 33.33% more. 16 GB vs 12 GB.
Both ship with comparable main camera, refresh rate, 5g support, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Xiaomi 15 or Xiaomi - MIX Fold 4?
Xiaomi 15 leads the current Mars Score by 0.3 points.The more useful decision is the trade-off behind that result: compare screen size, ram, pixel density, battery capacity against the way you will actually use the product.
Choose Xiaomi 15 if…
Xiaomi 15 has the measurable edge on front cam mp, wired charging w, weight g.
Choose Xiaomi - MIX Fold 4 if…
Xiaomi - MIX Fold 4 has the measurable edge on ram gb, screen size in, ip rating.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Xiaomi 15 wins
- ▲Front camera — 60.00% more. 32 MP vs 20 MP.
- ▲Wired charging — 34.33% more. 90 W vs 67 W.
- ▲Weight — 34.00 g less. 192 vs 226.
- ▲AnTuTu — 31.37% more. 2680000 vs 2040000.
- ▲Pixel density — 14.43% more. 460 ppi vs 402 ppi.
- ▲Battery capacity — 5.88% more. 5400 mAh vs 5100 mAh.
Why Xiaomi - MIX Fold 4 wins
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Screen size — 25.47% more. 7.98 " vs 6.36 ".
- ▲Water resistance: IPX8 (vs IP68).
Spec comparison
Design
| Spec | Xiaomi 15 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Weight | 192 glead | 226 g |
| Thickness | 8.1 mmlead | 9.47 mm |
| Water resistanceⓘ | IP68 | IPX8lead |
| Form factor | bar | foldable_booklead |
Display
| Spec | Xiaomi 15 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Screen size | 6.36 " | 7.98 "lead |
| Pixel densityⓘ | 460 ppilead | 402 ppi |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 3200 nitslead | 3000 nits |
Performance
| Spec | Xiaomi 15 | Xiaomi - MIX Fold 4 |
|---|---|---|
| RAMⓘ | 12 GB | 16 GBlead |
| Storageⓘ | 256 GB | 512 GBlead |
| AnTuTuⓘ | 2680000lead | 2040000 |
| CPU total clockⓘ | 22.8 GHzlead | 21.0 GHz |
Cameras
| Spec | Xiaomi 15 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MPlead | 20 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Xiaomi 15 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Battery capacityⓘ | 5400 mAhlead | 5100 mAh |
| Wired chargingⓘ | 90 Wlead | 67 W |
| Wireless chargingⓘ | 50 W | 50 W |
Connectivity
| Spec | Xiaomi 15 | Xiaomi - MIX Fold 4 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Xiaomi 15 | Xiaomi - MIX Fold 4 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 4 years | 4 years |
Frequently asked
Which has better battery, Xiaomi 15 or MIX Fold 4?+
Xiaomi 15 has 5.9% more battery — 5400 mAh vs 5100 mAh.
Which is lighter, Xiaomi 15 or MIX Fold 4?+
Xiaomi 15 is 34g lighter — 192g vs 226g.
Is Xiaomi 15 waterproof?+
Xiaomi 15 has an IP68 rating.
Does MIX Fold 4 support 5G?+
Yes, MIX Fold 4 supports 5G.
Which has more RAM, Xiaomi 15 or MIX Fold 4?+
MIX Fold 4 offers 16GB of RAM.
Which has a better camera, Xiaomi 15 or MIX Fold 4?+
MIX Fold 4 has a 50 MP main camera vs 50 MP.