Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Apple - iPhone 18 Pro Max | OnePlus 15 |
|---|---|---|
| Wired charging | 60 W | 120 W |
| Wireless charging | 25 W | 50 W |
| Front camera | 18 MP | 32 MP |
| Battery capacity | 5391 mAh | 7500 mAh |
| Weight | 249 g | 211 g |
| RAM | 12 GB | 16 GB |
Between the iPhone 18 Pro Max and OnePlus 15, the iPhone 18 Pro Max comes out ahead in antutu / pixel density, while the OnePlus 15 wins on wired charging / wireless charging. Overall, the iPhone 18 Pro Max scores 69.9 and the OnePlus 15 scores 76.7 on our Mars Score.
Which should you buy?
The OnePlus 15 edges ahead on the Mars Score (69.9 vs 76.7), but the 6.8-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the iPhone 18 Pro Max 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 antutu, pixel density, screen size, among others. The single most decisive one: AnTuTu — 20.34% more. 3550000 vs 2950000.
Pick the OnePlus 15 if you photograph or shoot video regularly and want the better imaging pipeline of the two. Its strongest claims are wired charging, wireless charging, front camera, among others. The single most decisive one: Wired charging — 100.00% more. 120 W vs 60 W.
Both ship with comparable refresh rate, 5g support, optical image stabilization, so those specs do not separate the two — focus on the differences below.
Bottom line: the OnePlus 15 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Apple - iPhone 18 Pro Max or OnePlus 15?
OnePlus 15 leads the current Mars Score by 6.8 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 Apple - iPhone 18 Pro Max if…
Apple - iPhone 18 Pro Max has the measurable edge on antutu score, pixel density ppi, screen size in.
Choose OnePlus 15 if…
OnePlus 15 has the measurable edge on wired charging w, wireless charging w, front cam mp.
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 Apple - iPhone 18 Pro Max wins
- ▲AnTuTu — 20.34% more. 3550000 vs 2950000.
- ▲Pixel density — 2.22% more. 460 ppi vs 450 ppi.
- ▲Screen size — 1.77% more. 6.9 " vs 6.78 ".
- ▲Promised OS updates: 6 (vs 5).
Why OnePlus 15 wins
- ▲Wired charging — 100.00% more. 120 W vs 60 W.
- ▲Wireless charging — 100.00% more. 50 W vs 25 W.
- ▲Front camera — 77.78% more. 32 MP vs 18 MP.
- ▲Battery capacity — 39.12% more. 7500 mAh vs 5391 mAh.
- ▲Weight — 38.00 g less. 211 vs 249.
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Main camera — 4.17% more. 50 MP vs 48 MP.
- ▲Water resistance: IP69 (vs IP68).
Spec comparison
Design
| Spec | Apple - iPhone 18 Pro Max | OnePlus 15 |
|---|---|---|
| Weight | 249 g | 211 glead |
| Thickness | 8.75 mm | 8.3 mmlead |
| Water resistanceⓘ | IP68 | IP69lead |
| Form factor | bar | bar |
Display
| Spec | Apple - iPhone 18 Pro Max | OnePlus 15 |
|---|---|---|
| Screen size | 6.9 "lead | 6.78 " |
| Pixel densityⓘ | 460 ppilead | 450 ppi |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 3000 nits | 4500 nitslead |
Performance
| Spec | Apple - iPhone 18 Pro Max | OnePlus 15 |
|---|---|---|
| RAMⓘ | 12 GB | 16 GBlead |
| Storageⓘ | 256 GB | 512 GBlead |
| AnTuTuⓘ | 3550000lead | 2950000 |
| CPU total clockⓘ | 20.3 GHz | 23.6 GHzlead |
Cameras
| Spec | Apple - iPhone 18 Pro Max | OnePlus 15 |
|---|---|---|
| Main cameraⓘ | 48 MP | 50 MPlead |
| Front camera | 18 MP | 32 MPlead |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Apple - iPhone 18 Pro Max | OnePlus 15 |
|---|---|---|
| Battery capacityⓘ | 5391 mAh | 7500 mAhlead |
| Wired chargingⓘ | 60 W | 120 Wlead |
| Wireless chargingⓘ | 25 W | 50 Wlead |
Connectivity
| Spec | Apple - iPhone 18 Pro Max | OnePlus 15 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Apple - iPhone 18 Pro Max | OnePlus 15 |
|---|---|---|
| OS | iOSlead | Android |
| Promised OS updates | 6 yearslead | 5 years |
Frequently asked
Which has better battery, iPhone 18 Pro Max or OnePlus 15?+
OnePlus 15 has 39.1% more battery — 5391 mAh vs 7500 mAh.
Which is lighter, iPhone 18 Pro Max or OnePlus 15?+
OnePlus 15 is 38g lighter — 249g vs 211g.
Is iPhone 18 Pro Max waterproof?+
iPhone 18 Pro Max has an IP68 rating.
Does OnePlus 15 support 5G?+
Yes, OnePlus 15 supports 5G.
Which has more RAM, iPhone 18 Pro Max or OnePlus 15?+
OnePlus 15 offers 16GB of RAM.
Which has a better camera, iPhone 18 Pro Max or OnePlus 15?+
OnePlus 15 has a 50 MP main camera vs 48 MP.