Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | OnePlus 13 | Xiaomi 15 Ultra |
|---|---|---|
| Wireless charging | 50 W | 80 W |
| Weight | 210 g | 229 g |
| Wired charging | 100 W | 90 W |
| AnTuTu | 2640000 | 2720000 |
| Pixel density | 510 ppi | 522 ppi |
| Screen size | 6.82 " | 6.73 " |
Between the OnePlus 13 and Xiaomi 15 Ultra, the OnePlus 13 comes out ahead in weight / wired charging, while the Xiaomi 15 Ultra wins on wireless charging / antutu. Overall, the OnePlus 13 scores 72.3 and the Xiaomi 15 Ultra scores 71.5 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (72.3 vs 71.5). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the OnePlus 13 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are weight, wired charging, screen size, among others. The single most decisive one: Weight — 19.00 g less. 210 vs 229.
Pick the Xiaomi 15 Ultra if you care most about wireless charging / antutu. Its strongest claims are wireless charging, antutu, pixel density. The single most decisive one: Wireless charging — 60.00% more. 80 W vs 50 W.
Both ship with comparable battery capacity, ram, main camera, 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 13 or Xiaomi 15 Ultra?
OnePlus 13 leads the current Mars Score by 0.8 points.The more useful decision is the trade-off behind that result: compare screen size, pixel density against the way you will actually use the product.
Choose OnePlus 13 if…
OnePlus 13 has the measurable edge on weight g, wired charging w, screen size in.
Choose Xiaomi 15 Ultra if…
Xiaomi 15 Ultra has the measurable edge on wireless charging w, antutu score, pixel density ppi.
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 13 wins
- ▲Weight — 19.00 g less. 210 vs 229.
- ▲Wired charging — 11.11% more. 100 W vs 90 W.
- ▲Screen size — 1.34% more. 6.82 " vs 6.73 ".
- ▲Water resistance: IP69 (vs IP68).
Why Xiaomi 15 Ultra wins
- ▲Wireless charging — 60.00% more. 80 W vs 50 W.
- ▲AnTuTu — 3.03% more. 2720000 vs 2640000.
- ▲Pixel density — 2.35% more. 522 ppi vs 510 ppi.
Spec comparison
Design
| Spec | OnePlus 13 | Xiaomi 15 Ultra |
|---|---|---|
| Weight | 210 glead | 229 g |
| Thickness | 8.5 mmlead | 9.4 mm |
| Water resistanceⓘ | IP69lead | IP68 |
| Form factor | bar | bar |
Display
| Spec | OnePlus 13 | Xiaomi 15 Ultra |
|---|---|---|
| Screen size | 6.82 "lead | 6.73 " |
| Pixel densityⓘ | 510 ppi | 522 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 4500 nitslead | 3200 nits |
Performance
| Spec | OnePlus 13 | Xiaomi 15 Ultra |
|---|---|---|
| RAMⓘ | 16 GB | 16 GB |
| Storageⓘ | 512 GB | 512 GB |
| AnTuTuⓘ | 2640000 | 2720000lead |
| CPU total clockⓘ | 22.8 GHz | 22.8 GHz |
Cameras
| Spec | OnePlus 13 | Xiaomi 15 Ultra |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | OnePlus 13 | Xiaomi 15 Ultra |
|---|---|---|
| Battery capacityⓘ | 6000 mAh | 6000 mAh |
| Wired chargingⓘ | 100 Wlead | 90 W |
| Wireless chargingⓘ | 50 W | 80 Wlead |
Connectivity
| Spec | OnePlus 13 | Xiaomi 15 Ultra |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | OnePlus 13 | Xiaomi 15 Ultra |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 4 years | 4 years |
Frequently asked
Which has better battery, OnePlus 13 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has 0.0% more battery — 6000 mAh vs 6000 mAh.
Which is lighter, OnePlus 13 or Xiaomi 15 Ultra?+
OnePlus 13 is 19g lighter — 210g vs 229g.
Is OnePlus 13 waterproof?+
OnePlus 13 has an IP69 rating.
Does Xiaomi 15 Ultra support 5G?+
Yes, Xiaomi 15 Ultra supports 5G.
Which has a better camera, OnePlus 13 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has a 50 MP main camera vs 50 MP.