OnePlus 13 vs Galaxy S25 Ultra
The OnePlus 13 and the Galaxy S25 Ultra are two different answers to the same flagship smartphone brief, each with its own set of priorities. Here the question is less “which is better?” and more “which strength do you need?” Is it display with the OnePlus 13, or memory & storage with the Galaxy S25 Ultra? Budget is a real factor too: at launch, the OnePlus 13 undercut the Galaxy S25 Ultra by $400.
At a glance
- Display OnePlus 13 wins
- Performance Tie
- Memory & Storage Galaxy S25 Ultra wins
- Camera Galaxy S25 Ultra wins
- Battery & Charging OnePlus 13 wins
- Software & Updates Galaxy S25 Ultra wins
- Price OnePlus 13 wins
- Display8.2
- Performance5.9
- Memory & Storage3.6
- Camera3.3
- Battery & Charging6.2
- Display6.9
- Performance5.9
- Memory & Storage4.5
- Camera5.5
- Battery & Charging2.8
Spec scores (0 to 10) are calculated from manufacturer specs against other models in the same class. See how the formula works. They are not reviews or user ratings.
Key Differences
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The Galaxy S25 Ultra has 3 years of extra promised updates
The OnePlus 13 gives up a lot on promised os updates: 4 years, compared with 7 years on the Galaxy S25 Ultra. A longer update promise keeps the phone secure and current for longer, which matters if you keep devices for several years.
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The Galaxy S25 Ultra has 5× optical zoom versus 3×
Few buyers will miss this one. The Galaxy S25 Ultra brings 5× to the table; the OnePlus 13 brings 3×. Digital zoom can fake reach, but optical zoom is where the detail actually comes from.
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The OnePlus 13 has 20% more battery capacity
When it comes to battery capacity, the OnePlus 13 wins comfortably with 6,000 mAh against 5,000 mAh. Capacity isn’t everything, but when two phones are otherwise close, more milliamp-hours is the simplest endurance advantage there is.
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The Galaxy S25 Ultra has a higher-resolution 200 MP main camera
It’s a lopsided result (200 MP for the Galaxy S25 Ultra, 50 MP for the OnePlus 13) and one of the main reasons to choose between them. More megapixels on the main camera allow bigger crops and more detail in good light, but sensor size and processing matter just as much.
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The OnePlus 13 has faster 80 W wired charging
The spread here is large: 80 W on the OnePlus 13 versus 45 W on the Galaxy S25 Ultra. Expect to notice it. The OnePlus 13 refills faster on a cable, which matters most on the mornings you forgot to charge overnight.
Design & Size
- OnePlus 13 6.41 in × 3.01 in × 0.33 in
- Galaxy S25 Ultra 6.41 in × 3.06 in × 0.32 in
The official dimensions put the OnePlus 13 and the Galaxy S25 Ultra within a whisker of each other. On the scale, these two are practically level.
Design & Build
| Spec | OnePlus 13 | Galaxy S25 Ultra |
|---|---|---|
| Height | 6.41 in | 6.41 in |
| Width | 3.01 in | 3.06 in |
| Thickness | 0.33 in | 0.32 in |
| Weight | 7.41 oz | 7.69 oz |
| Water & dust rating | IP68/IP69 (winner) | IP68 |
| Frame | Aluminum | Titanium |
Display
OnePlus 13 leads
The display comparison is one-sided. The OnePlus 13 leads where it counts. In its favor, the OnePlus 13 has 73% higher peak brightness. Peak brightness decides how readable the screen stays in direct sunlight and how punchy HDR content looks. The display verdict goes to the OnePlus 13.
Peak brightness
OnePlus 13: 4,500 nits Galaxy S25 Ultra: 2,600 nits If you use your phone outdoors a lot, the OnePlus 13’s brighter panel is the one that holds up better at midday.
Performance
Too close to call
If performance matters most to you, this section won’t make the decision for you: they’re level. Both cover performance well enough that other priorities should break the tie.
Memory & Storage
Galaxy S25 Ultra leads
This area is close, with the Galaxy S25 Ultra just ahead of the OnePlus 13. Here the Galaxy S25 Ultra offers a bigger top storage option. The top storage option only matters if you plan to buy a high-capacity version, but it caps how much you can ever keep on the phone. So if memory & storage tops your list, lean toward the Galaxy S25 Ultra.
Max storage
OnePlus 13: 512 GB Galaxy S25 Ultra: 1 TB Most buyers are fine with a base or middle tier, so this is a niche advantage, but a real one if you need it.
Camera
Galaxy S25 Ultra leads
The OnePlus 13 has a tough time in the camera section, where the Galaxy S25 Ultra pulls well ahead. The Galaxy S25 Ultra adds 5× optical zoom versus 3×. The Galaxy S25 Ultra reaches further with real optics, which pays off for wildlife, stages and sports from the stands. Point to the OnePlus 13 for a sharper 32 MP selfie camera. If this section decides it for you, choose the Galaxy S25 Ultra.
Optical zoom
OnePlus 13: 3× Galaxy S25 Ultra: 5× Higher optical zoom lets you frame distant subjects tightly without losing detail to digital cropping.
Main camera
OnePlus 13: 50 MP Galaxy S25 Ultra: 200 MP The Galaxy S25 Ultra’s higher-resolution main sensor gives you more room to crop, which helps when you can’t get closer.
Battery & Charging
OnePlus 13 leads
The OnePlus 13 is the clear pick if battery & charging is what you care about most. The OnePlus 13 scores with 20% more battery capacity. A bigger battery usually means longer days between charges, although chip efficiency and screen size also shape real endurance. In short, the OnePlus 13 is the better-equipped phone for battery & charging.
Battery capacity
OnePlus 13: 6,000 mAh Galaxy S25 Ultra: 5,000 mAh Extra capacity also ages better: after a few years of charge cycles, the OnePlus 13 has more headroom left.
Wired charging
OnePlus 13: 80 W Galaxy S25 Ultra: 45 W Faster wired charging means a short top-up before you head out goes further.
Software & Updates
Galaxy S25 Ultra leads
Few areas are as clear-cut as this one: the Galaxy S25 Ultra leads the software & updates section with room to spare. The Galaxy S25 Ultra gives you 3 years of extra promised updates. Software support is what separates a phone that ages gracefully from one that doesn’t, making it one of the most practical lines on the spec sheet. Weighing only software & updates, the Galaxy S25 Ultra comes out ahead.
Promised OS updates
OnePlus 13: 4 years Galaxy S25 Ultra: 7 years The Galaxy S25 Ultra’s longer software support can also help its resale value later on.
Full Specifications
Display
| Spec | OnePlus 13 | Galaxy S25 Ultra |
|---|---|---|
| Screen size | 6.8 in | 6.9 in |
| Panel type | LTPO AMOLED | Dynamic AMOLED 2X |
| Resolution | 3168 x 1440 | 3120 x 1440 |
| Pixel density | 510 ppi | 498 ppi |
| Refresh rate | 120 Hz | 120 Hz |
| Peak brightness | 4,500 nits (winner) | 2,600 nits |
| Always-on display | Yes | Yes |
Performance
| Spec | OnePlus 13 | Galaxy S25 Ultra |
|---|---|---|
| Chipset | Snapdragon 8 Elite | Snapdragon 8 Elite for Galaxy |
| CPU cores | 8 | 8 |
| Process node | 3 nm | 3 nm |
| RAM | 12 GB | 12 GB |
Memory & Storage
| Spec | OnePlus 13 | Galaxy S25 Ultra |
|---|---|---|
| Base storage | 256 GB | 256 GB |
| Max storage | 512 GB | 1 TB (winner) |
| microSD slot | No | No |
Camera
| Spec | OnePlus 13 | Galaxy S25 Ultra |
|---|---|---|
| Main camera | 50 MP | 200 MP (winner) |
| Ultra-wide camera | 50 MP | 50 MP |
| Telephoto camera | 50 MP | 50 MP |
| Optical zoom | 3× | 5× (winner) |
| Rear cameras | 3 | 4 (winner) |
| Front camera | 32 MP (winner) | 12 MP |
| Max video | 8K30 | 8K30 |
Battery & Charging
| Spec | OnePlus 13 | Galaxy S25 Ultra |
|---|---|---|
| Battery capacity | 6,000 mAh (winner) | 5,000 mAh |
| Wired charging | 80 W (winner) | 45 W |
| Wireless charging | 50 W (winner) | 15 W |
| Port | USB-C (USB 3.2 Gen 1) | USB-C |
Software & Updates
| Spec | OnePlus 13 | Galaxy S25 Ultra |
|---|---|---|
| OS at launch | OxygenOS 15 (Android 15) | Android 15 (One UI 7) |
| Promised OS updatesManufacturer commitment | 4 years | 7 years (winner) |
Design & Build
| Spec | OnePlus 13 | Galaxy S25 Ultra |
|---|---|---|
| Height | 6.41 in | 6.41 in |
| Width | 3.01 in | 3.06 in |
| Thickness | 0.33 in | 0.32 in |
| Weight | 7.41 oz | 7.69 oz |
| Water & dust rating | IP68/IP69 (winner) | IP68 |
| Frame | Aluminum | Titanium |
Price
| Spec | OnePlus 13 | Galaxy S25 Ultra |
|---|---|---|
| Launch price | $900 (winner) | $1,300 |
“N/A” means the manufacturer does not specify the value or we could not confirm it. Figures marked “manufacturer rating” are the maker’s own claims, not our measurements.
Price & Value
Money is a real factor here: the launch prices are 44% apart, a difference of $400. Paying $400 more for the Galaxy S25 Ultra gets you some gains, but it also leaves some areas to the OnePlus 13.
All prices are official US launch prices, last checked January 2025. Actual prices at stores may differ.
Which One Should You Buy?
Choose the OnePlus 13 if…
- you want the bigger battery (6,000 mAh vs 5,000 mAh)
- you often need a quick top-up before heading out (80 W vs 45 W wired)
- you use your phone outdoors a lot (4,500 nits vs 2,600 nits peak brightness)
- you want the sharper selfie camera (32 MP vs 12 MP)
- you want the lower price and can live with the trade-offs ($400 less)
Choose the Galaxy S25 Ultra if…
- you want software support that lasts longer (7 years vs 4 years)
- you want more optical reach (5× vs 3×)
- you like to crop into your photos (200 MP vs 50 MP main camera)
- you want more lenses to choose from (4 vs 3 rear cameras)
Also Compared
Frequently Asked Questions
Should I buy the OnePlus 13 or the Galaxy S25 Ultra?
The Galaxy S25 Ultra has its strengths, but the OnePlus 13 saves $400, which makes it the value pick.
Which has better battery life, the OnePlus 13 or the Galaxy S25 Ultra?
On paper, the OnePlus 13 has the edge: 6,000 mAh of battery capacity against 5,000 mAh for the Galaxy S25 Ultra. Real-world results also depend on how you use it.
Is the OnePlus 13 bigger than the Galaxy S25 Ultra?
Size is essentially a tie. The official dimensions of the OnePlus 13 and the Galaxy S25 Ultra differ only marginally.
Which has the better camera, the OnePlus 13 or the Galaxy S25 Ultra?
The Galaxy S25 Ultra has the edge for photography, offering 5× optical zoom versus 3× and a higher-resolution 200 MP main camera.
Is the OnePlus 13’s display better than the Galaxy S25 Ultra’s?
The OnePlus 13 has the stronger display on paper, with 73% higher peak brightness.
Is the OnePlus 13 cheaper than the Galaxy S25 Ultra?
The Galaxy S25 Ultra launched at $400 more than the OnePlus 13, based on prices as of January 2025.
Executive Summary
Honestly, the OnePlus 13 versus the Galaxy S25 Ultra is one of those matchups where your priorities matter more than the logo. I keep coming back to one thing: the OnePlus 13 gets 20% more battery capacity. I also like that the OnePlus 13 brings 73% higher peak brightness. That said, the Galaxy S25 Ultra answers with 3 years of extra promised updates, which some people will value more.
Fit matters more than scores here. The OnePlus 13 suits buyers focused on display; the Galaxy S25 Ultra suits those focused on memory & storage.
My pick: the OnePlus 13, and I’d only stretch to the Galaxy S25 Ultra if $400 truly doesn’t matter to you.
Personal opinion based on the data above. Your priorities may differ.