Between the OnePlus Open 2 and MIX Fold 4, the OnePlus Open 2 comes out ahead in front camera and antutu, while the MIX Fold 4 wins on weight and water resistance. Overall, the OnePlus Open 2 scores 74.5 and the MIX Fold 4 scores 71.4 on our Mars Score.
Which should you buy?
The OnePlus Open 2 edges ahead on the Mars Score (74.5 vs 71.4), but the 3.1-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the OnePlus Open 2 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, antutu, wired charging, among others.
Pick the MIX Fold 4 if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight, water resistance.
Both ship with comparable ram, main camera, refresh rate, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.
Why OnePlus Open 2 wins
- ▲Front camera — 60.00% more. 32 MP vs 20 MP.
- ▲AnTuTu — 31.37% more. 2680000 vs 2040000.
- ▲Wired charging — 19.40% more. 80 W vs 67 W.
- ▲Battery capacity — 11.76% more. 5700 mAh vs 5100 mAh.
- ▲Screen size — 0.25% more. 8.0 " vs 7.98 ".
Why Xiaomi - MIX Fold 4 wins
- ▲Weight — 13.00 g less. 226 vs 239.
- ▲Water resistance: IPX8 (vs IP68).
Spec comparison
Design
| Spec | OnePlus Open 2 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Weight | 239 g | 226 glead |
| Thickness | 11.7 mm | 9.47 mmlead |
| Water resistanceⓘ | IP68 | IPX8lead |
| Form factor | foldable_book | foldable_book |
Display
| Spec | OnePlus Open 2 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Screen sizeⓘ | 8.0 "lead | 7.98 " |
| Pixel densityⓘ | 402 ppi | 402 ppi |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 4500 nitslead | 3000 nits |
Performance
Cameras
| Spec | OnePlus Open 2 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MPlead | 20 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | OnePlus Open 2 | Xiaomi - MIX Fold 4 |
|---|---|---|
| Battery capacity | 5700 mAhlead | 5100 mAh |
| Wired chargingⓘ | 80 Wlead | 67 W |
| Wireless chargingⓘ | 50 W | 50 W |
Connectivity
| Spec | OnePlus Open 2 | Xiaomi - MIX Fold 4 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | OnePlus Open 2 | Xiaomi - MIX Fold 4 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 4 years | 4 years |
Frequently asked
Which has better battery, OnePlus Open 2 or MIX Fold 4?+
OnePlus Open 2 has 11.8% more battery — 5700 mAh vs 5100 mAh.
Which is lighter, OnePlus Open 2 or MIX Fold 4?+
MIX Fold 4 is 13g lighter — 239g vs 226g.
Is OnePlus Open 2 waterproof?+
OnePlus Open 2 has an IP68 rating.
Does MIX Fold 4 support 5G?+
Yes, MIX Fold 4 supports 5G.
Which has a better camera, OnePlus Open 2 or MIX Fold 4?+
MIX Fold 4 has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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