Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | OnePlus 12 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Front camera | 32 MP | 20 MP |
| Wired charging | 100 W | 67 W |
| RAM | 12 GB | 16 GB |
| Pixel density | 510 ppi | 402 ppi |
| Screen size | 6.82 " | 7.98 " |
| Weight | 220 g | 226 g |
Between the OnePlus 12 and MIX Fold 4, the OnePlus 12 comes out ahead in front camera / wired charging, while the MIX Fold 4 wins on ram / screen size. Overall, the OnePlus 12 scores 68.2 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 (68.2 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 OnePlus 12 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, pixel density, 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: OnePlus 12 or Xiaomi - MIX Fold 4?
Xiaomi - MIX Fold 4 leads the current Mars Score by 1.3 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 OnePlus 12 if…
OnePlus 12 has the measurable edge on front cam mp, wired charging w, pixel density ppi.
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 OnePlus 12 wins
- ▲Front camera — 60.00% more. 32 MP vs 20 MP.
- ▲Wired charging — 49.25% more. 100 W vs 67 W.
- ▲Pixel density — 26.87% more. 510 ppi vs 402 ppi.
- ▲Weight — 6.00 g less. 220 vs 226.
- ▲Battery capacity — 5.88% more. 5400 mAh vs 5100 mAh.
- ▲AnTuTu — 0.98% more. 2060000 vs 2040000.
Why Xiaomi - MIX Fold 4 wins
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Screen size — 17.01% more. 7.98 " vs 6.82 ".
- ▲Water resistance: IPX8 (vs IP65).
Spec comparison
Design
| Spec | OnePlus 12 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Weight | 220 glead | 226 g |
| Thickness | 9.15 mmlead | 9.47 mm |
| Water resistanceⓘ | IP65 | IPX8lead |
| Form factor | bar | foldable_booklead |
Display
| Spec | OnePlus 12 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Screen size | 6.82 " | 7.98 "lead |
| Pixel densityⓘ | 510 ppilead | 402 ppi |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 4500 nitslead | 3000 nits |
Performance
| Spec | OnePlus 12 | Xiaomi - MIX Fold 4 |
|---|---|---|
| RAMⓘ | 12 GB | 16 GBlead |
| Storageⓘ | 256 GB | 512 GBlead |
| AnTuTuⓘ | 2060000lead | 2040000 |
| CPU total clockⓘ | 21.0 GHz | 21.0 GHz |
Cameras
| Spec | OnePlus 12 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MPlead | 20 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | OnePlus 12 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Battery capacityⓘ | 5400 mAhlead | 5100 mAh |
| Wired chargingⓘ | 100 Wlead | 67 W |
| Wireless chargingⓘ | 50 W | 50 W |
Connectivity
| Spec | OnePlus 12 | Xiaomi - MIX Fold 4 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | OnePlus 12 | Xiaomi - MIX Fold 4 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 4 years | 4 years |
Frequently asked
Which has better battery, OnePlus 12 or MIX Fold 4?+
OnePlus 12 has 5.9% more battery — 5400 mAh vs 5100 mAh.
Which is lighter, OnePlus 12 or MIX Fold 4?+
OnePlus 12 is 6g lighter — 220g vs 226g.
Is OnePlus 12 waterproof?+
OnePlus 12 has an IP65 rating.
Does MIX Fold 4 support 5G?+
Yes, MIX Fold 4 supports 5G.
Which has more RAM, OnePlus 12 or MIX Fold 4?+
MIX Fold 4 offers 16GB of RAM.
Which has a better camera, OnePlus 12 or MIX Fold 4?+
MIX Fold 4 has a 50 MP main camera vs 50 MP.