Between the OnePlus 15 and OnePlus Open 2, the OnePlus 15 comes out ahead in wired charging and battery capacity, while the OnePlus Open 2 wins on screen size. Overall, the OnePlus 15 scores 78.4 and the OnePlus Open 2 scores 74.5 on our Mars Score.
Which should you buy?
The OnePlus 15 edges ahead on the Mars Score (78.4 vs 74.5), but the 3.9-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the OnePlus 15 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are wired charging, battery capacity, weight, among others.
Pick the OnePlus Open 2 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 screen size.
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 15 wins
- ▲Wired charging — 50.00% more. 120 W vs 80 W.
- ▲Battery capacity — 31.58% more. 7500 mAh vs 5700 mAh.
- ▲Weight — 28.00 g less. 211 vs 239.
- ▲Pixel density — 11.94% more. 450 ppi vs 402 ppi.
- ▲AnTuTu — 10.07% more. 2950000 vs 2680000.
- ▲Water resistance: IP69 (vs IP68).
- ▲Promised OS updates: 5 (vs 4).
Why OnePlus Open 2 wins
- ▲Screen size — 17.99% more. 8.0 " vs 6.78 ".
Spec comparison
Design
| Spec | OnePlus 15 | OnePlus Open 2 |
|---|---|---|
| Weight | 211 glead | 239 g |
| Thickness | 8.3 mmlead | 11.7 mm |
| Water resistanceⓘ | IP69lead | IP68 |
| Form factor | bar | foldable_booklead |
Display
| Spec | OnePlus 15 | OnePlus Open 2 |
|---|---|---|
| Screen sizeⓘ | 6.78 " | 8.0 "lead |
| Pixel densityⓘ | 450 ppilead | 402 ppi |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 4500 nits | 4500 nits |
Performance
Cameras
| Spec | OnePlus 15 | OnePlus Open 2 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | OnePlus 15 | OnePlus Open 2 |
|---|---|---|
| Battery capacity | 7500 mAhlead | 5700 mAh |
| Wired chargingⓘ | 120 Wlead | 80 W |
| Wireless chargingⓘ | 50 W | 50 W |
Connectivity
| Spec | OnePlus 15 | OnePlus Open 2 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | OnePlus 15 | OnePlus Open 2 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 5 yearslead | 4 years |
Frequently asked
Which has better battery, OnePlus 15 or OnePlus Open 2?+
OnePlus 15 has 31.6% more battery — 7500 mAh vs 5700 mAh.
Which is lighter, OnePlus 15 or OnePlus Open 2?+
OnePlus 15 is 28g lighter — 211g vs 239g.
Is OnePlus 15 waterproof?+
OnePlus 15 has an IP69 rating.
Does OnePlus Open 2 support 5G?+
Yes, OnePlus Open 2 supports 5G.
Which has a better camera, OnePlus 15 or OnePlus Open 2?+
OnePlus Open 2 has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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