Apple iPhone 18 Pro Max vs OnePlus 15
Smartphones comparison: specs, VersusAnything Score, key differences and a clear recommendation.
Choosing between Apple iPhone 18 Pro Max and OnePlus 15 comes up constantly, so we ran both through the same 15-row comparison and our category scoring. The iPhone 18 Pro Max is Apple's longest-lasting Pro iPhone, rated for 43 hours of video playback, with the A20 Pro chip and the variable-aperture camera system. The OnePlus 15 pairs a 7,300 mAh silicon-carbon battery with the Snapdragon 8 Elite Gen 5 and a 165 Hz display, undercutting most flagships on price.
Quick verdict
On the VersusAnything Score, OnePlus 15 finishes ahead, 64 to 46. It is the better buy for users who want the longest battery life and fastest charging in a flagship; for heavy users who want the biggest screen and battery Apple makes, iPhone 18 Pro Max still makes more sense.
VersusAnything Score
Scores are calculated from measurable specifications normalised within the smartphones category and weighted by the factors above. Text-only rows (such as chipset or operating system) are explained but not scored. How the score works.
Side-by-side overview
Apple iPhone 18 Pro Max
The iPhone 18 Pro Max is Apple's longest-lasting Pro iPhone, rated for 43 hours of video playback, with the A20 Pro chip and the variable-aperture camera system.
Best for heavy users who want the biggest screen and battery Apple makes
OnePlus 15
The OnePlus 15 pairs a 7,300 mAh silicon-carbon battery with the Snapdragon 8 Elite Gen 5 and a 165 Hz display, undercutting most flagships on price.
Best for users who want the longest battery life and fastest charging in a flagship
Key differences
- Display type: iPhone 18 Pro Max OLED (ProMotion LTPO) vs OnePlus 15 LTPO AMOLED — a preference, not a scored win
- Screen size: iPhone 18 Pro Max 6.9" vs OnePlus 15 6.78" — a preference, not a scored win
- Chipset: iPhone 18 Pro Max Apple A20 Pro vs OnePlus 15 Snapdragon 8 Elite Gen 5 — a preference, not a scored win
- Rear cameras: iPhone 18 Pro Max Triple (variable-aperture wide + ultrawide + 4x telephoto) vs OnePlus 15 Triple (wide + ultrawide + 3.5x telephoto) — a preference, not a scored win
- Water resistance: iPhone 18 Pro Max IP68 vs OnePlus 15 IP69K — a preference, not a scored win
Specification comparison table
| Specification | iPhone 18 Pro Max | OnePlus 15 |
|---|---|---|
| Display type | OLED (ProMotion LTPO) | LTPO AMOLED |
| Screen size | 6.9" | 6.78" |
| Refresh rate | 120 Hz | 165 Hz |
| Chipset | Apple A20 Pro | Snapdragon 8 Elite Gen 5 |
| RAM | 12 GB | 12 GB |
| Base storage | 256 GB | 256 GB |
| Main camera | 48 MP | 50 MP |
| Rear cameras | Triple (variable-aperture wide + ultrawide + 4x telephoto) | Triple (wide + ultrawide + 3.5x telephoto) |
| Battery | 5,200 mAh | 7,300 mAh |
| Wired charging | 40 W | 80 W |
| Weight | 232 g | 215 g |
| Water resistance | IP68 | IP69K |
| Operating system | iOS 27 | Android 16 (OxygenOS 16) |
| Promised OS updates | 6 years | 4 years |
| Launch price (USD) | $1,299 | $899 |
Display: iPhone 18 Pro Max vs OnePlus 15 Score: iPhone 18 Pro Max 52 · OnePlus 15 100
iPhone 18 Pro Max: OLED (ProMotion LTPO). OnePlus 15: LTPO AMOLED. Neither is scored, but panel technology affects contrast, outdoor visibility and power draw. The two differ on screen size (6.9" against 6.78"), and a larger screen is easier for video and multitasking but harder to use one-handed.
The refresh rate row goes to OnePlus 15: 165 Hz against 120 Hz. A higher refresh rate makes scrolling and animations look smoother.
Performance: iPhone 18 Pro Max vs OnePlus 15 Score: iPhone 18 Pro Max 60 · OnePlus 15 60
For chipset, iPhone 18 Pro Max uses Apple A20 Pro whereas OnePlus 15 goes with Snapdragon 8 Elite Gen 5. This is a preference rather than a scored win: the chipset sets the ceiling for gaming, AI features and long-term speed. On RAM the two match exactly (12 GB).
Both list 256 GB for base storage, so nothing separates them here.
Camera: iPhone 18 Pro Max vs OnePlus 15 Score: iPhone 18 Pro Max 54 · OnePlus 15 62
The main camera row goes to OnePlus 15: 50 MP against 48 MP. Megapixels matter less than sensor size, but a higher count allows more cropping and detail in daylight.
For rear cameras, iPhone 18 Pro Max uses Triple (variable-aperture wide + ultrawide + 4x telephoto) whereas OnePlus 15 goes with Triple (wide + ultrawide + 3.5x telephoto). This is a preference rather than a scored win: extra lenses add telephoto reach or ultrawide flexibility.
Battery: iPhone 18 Pro Max vs OnePlus 15 Score: iPhone 18 Pro Max 80 · OnePlus 15 99
The battery row goes to OnePlus 15: 7,300 mAh against 5,200 mAh. More capacity generally means more screen-on time between charges.
OnePlus 15 offers 80 W of wired charging while iPhone 18 Pro Max stops at 40 W; the 40 W gap matters because faster wired charging shortens top-up time when you are in a hurry.
Design: iPhone 18 Pro Max vs OnePlus 15 Score: iPhone 18 Pro Max 6 · OnePlus 15 24
On weight, OnePlus 15 keeps it to 215 g while iPhone 18 Pro Max lists 232 g. That 17 g edge counts since a lighter phone is more comfortable for long sessions and in a pocket.
iPhone 18 Pro Max: IP68. OnePlus 15: IP69K. Neither is scored, but an IP rating tells you how much dust and water the phone can shrug off.
Software: iPhone 18 Pro Max vs OnePlus 15 Score: iPhone 18 Pro Max 24 · OnePlus 15 2
iPhone 18 Pro Max: iOS 27. OnePlus 15: Android 16 (OxygenOS 16). Neither is scored, but the OS decides your app ecosystem and how the phone fits with your other devices.
iPhone 18 Pro Max leads on promised OS updates with 6 years versus 4 years, a margin of 2 years. In practice longer update support keeps the phone secure and resale value higher.
Value: iPhone 18 Pro Max vs OnePlus 15 Score: iPhone 18 Pro Max 9 · OnePlus 15 70
OnePlus 15 is better on launch price (USD) at $899 against $1,299, a $400 difference; lower is better because the launch price is the fairest baseline because street prices vary by region.
Pros and cons
iPhone 18 Pro Max
Pros
- Best Pro iPhone battery life
- A20 Pro on 2 nm
- 6.9-inch ProMotion display
- Better promised OS updates (6 years)
Cons
- Weaker refresh rate (120 Hz)
- Weaker main camera (48 MP)
- Weaker battery (5,200 mAh)
- Weaker wired charging (40 W)
OnePlus 15
Pros
- 7,300 mAh battery
- 165 Hz display
- Snapdragon 8 Elite Gen 5
- Better promised OS updates (4 years)
Cons
- Weaker refresh rate (165 Hz)
- Weaker main camera (50 MP)
- Weaker battery (7,300 mAh)
- Weaker wired charging (80 W)
Which one should you buy?
Choose Apple iPhone 18 Pro Max for…
Heavy users who want the biggest screen and battery Apple makes. It stands out for best pro iphone battery life, a20 pro on 2 nm, 6.9-inch promotion display.
Choose OnePlus 15 for…
Users who want the longest battery life and fastest charging in a flagship. It stands out for 7,300 mah battery, 165 hz display, snapdragon 8 elite gen 5.
Final verdict
OnePlus 15 scores 64 to iPhone 18 Pro Max's 46 on our category weighting, making it the stronger overall pick for users who want the longest battery life and fastest charging in a flagship. iPhone 18 Pro Max remains the right call for heavy users who want the biggest screen and battery Apple makes. The VersusAnything Score is a transparent starting point, not a command; weight the rows you care about and the right answer for you may differ.
Compare with another phone
Frequently asked questions
Is iPhone 18 Pro Max better than OnePlus 15?
On the VersusAnything Score, OnePlus 15 finishes ahead 64 to 46. That makes OnePlus 15 the better overall pick for users who want the longest battery life and fastest charging in a flagship, while iPhone 18 Pro Max is still the right choice for heavy users who want the biggest screen and battery Apple makes.
What is the biggest difference between iPhone 18 Pro Max and OnePlus 15?
The largest gap is display type: iPhone 18 Pro Max lists OLED (ProMotion LTPO) while OnePlus 15 lists LTPO AMOLED. Panel technology affects contrast, outdoor visibility and power draw.
Which is cheaper, iPhone 18 Pro Max or OnePlus 15?
OnePlus 15 is cheaper on launch price (USD): $899 against $1,299 for iPhone 18 Pro Max. Street prices vary by country and retailer, so check current offers.
Who should choose OnePlus 15 over iPhone 18 Pro Max?
OnePlus 15 is the better fit for users who want the longest battery life and fastest charging in a flagship. Its strongest points are 7,300 mah battery, 165 hz display, snapdragon 8 elite gen 5.
Sources
- iPhone 18 Pro Max: Apple iPhone 18 Pro Max page (manufacturer)
- OnePlus 15: OnePlus 15 page (manufacturer)
Specifications last verified: 2026-10-01. Prices are launch or official list prices in US dollars unless stated. See our sources and data policy.