Between the Phone (3a) and OnePlus 13, the Phone (3a) comes out ahead in weight, while the OnePlus 13 wins on antutu and ram. Overall, the Phone (3a) scores 62.5 and the OnePlus 13 scores 73.8 on our Mars Score.
Which should you buy?
The OnePlus 13 is the clear pick on raw spec strength, leading by 11.3 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 Phone (3a) 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 OnePlus 13 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, ram, wired charging, 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 OnePlus 13 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Nothing - Phone (3a) wins
- ▲Weight — 9.00 g less. 201 vs 210.
Why OnePlus 13 wins
- ▲AnTuTu — 221.95% more. 2640000 vs 820000.
- ▲RAM — 100.00% more. 16 GB vs 8 GB.
- ▲Wired charging — 100.00% more. 100 W vs 50 W.
- ▲Pixel density — 31.78% more. 510 ppi vs 387 ppi.
- ▲Battery capacity — 20.00% more. 6000 mAh vs 5000 mAh.
- ▲Screen size — 0.74% more. 6.82 " vs 6.77 ".
- ▲Water resistance: IP69 (vs IP64).
- ▲Promised OS updates: 4 (vs 3).
Spec comparison
Design
| Spec | Nothing - Phone (3a) | OnePlus 13 |
|---|---|---|
| Weight | 201 glead | 210 g |
| Thickness | 8.4 mmlead | 8.5 mm |
| Water resistanceⓘ | IP64 | IP69lead |
| Form factor | bar | bar |
Display
| Spec | Nothing - Phone (3a) | OnePlus 13 |
|---|---|---|
| Screen sizeⓘ | 6.77 " | 6.82 "lead |
| Pixel densityⓘ | 387 ppi | 510 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 3000 nits | 4500 nitslead |
Performance
Cameras
| Spec | Nothing - Phone (3a) | OnePlus 13 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Nothing - Phone (3a) | OnePlus 13 |
|---|---|---|
| Battery capacity | 5000 mAh | 6000 mAhlead |
| Wired chargingⓘ | 50 W | 100 Wlead |
| Wireless chargingⓘ | 0 W | 50 Wlead |
Connectivity
| Spec | Nothing - Phone (3a) | OnePlus 13 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Nothing - Phone (3a) | OnePlus 13 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 3 years | 4 yearslead |
Frequently asked
Which has better battery, Phone (3a) or OnePlus 13?+
OnePlus 13 has 20.0% more battery — 5000 mAh vs 6000 mAh.
Which is lighter, Phone (3a) or OnePlus 13?+
Phone (3a) is 9g lighter — 201g vs 210g.
Is Phone (3a) waterproof?+
Phone (3a) has an IP64 rating.
Does OnePlus 13 support 5G?+
Yes, OnePlus 13 supports 5G.
Which has more RAM, Phone (3a) or OnePlus 13?+
OnePlus 13 offers 16GB of RAM.
Which has a better camera, Phone (3a) or OnePlus 13?+
OnePlus 13 has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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