Galaxy S26 vs Xiaomi 17 Ultra
The Galaxy S26 and the Xiaomi 17 Ultra are two different answers to the same flagship smartphone brief, each with its own set of priorities. On balance, the Xiaomi 17 Ultra is the stronger package: it leads in 3 out of 4 areas, most clearly in performance.
At a glance
- Performance Xiaomi 17 Ultra wins
- Memory & Storage Xiaomi 17 Ultra wins
- Camera Tie
- Battery & Charging Xiaomi 17 Ultra wins
Key Differences
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The Xiaomi 17 Ultra has 40% more battery capacity
Among all the differences on this page, 6,000 mAh against 4,300 mAh is one of the most meaningful, and it favors the Xiaomi 17 Ultra. A bigger battery usually means longer days between charges, although chip efficiency and screen size also shape real endurance.
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The Xiaomi 17 Ultra has 4 GB more RAM
The Galaxy S26 gives up a lot on ram: 12 GB, compared with 16 GB on the Xiaomi 17 Ultra. Extra memory also gives the Xiaomi 17 Ultra more headroom for heavier apps and for software updates in the years ahead.
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The Xiaomi 17 Ultra has 512 GB of base storage instead of 256 GB
Few buyers will miss this one. The Xiaomi 17 Ultra brings 512 GB to the table; the Galaxy S26 brings 256 GB. If you shoot a lot of video or keep music and maps offline, base storage is one of the specs you’ll feel most over the years.
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The Xiaomi 17 Ultra has a 0.6-inch larger screen
Bigger or smaller? On screen size, the Xiaomi 17 Ultra has 6.9 in and the Galaxy S26 has 6.3 in. A larger display also means a larger phone overall, so this is as much about your hands and pockets as it is about the picture.
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The Xiaomi 17 Ultra has a tougher IP68/IP69 rating
On water & dust rating, the Xiaomi 17 Ultra edges out the Galaxy S26, IP68/IP69 to IP68. The Xiaomi 17 Ultra’s tougher rating doesn’t make it waterproof, but it offers more protection when accidents happen.
Design & Size
The Galaxy S26 is the smaller phone here, which some buyers will see as a plus and others as a compromise.
Design & Build
| Spec | Galaxy S26 | Xiaomi 17 Ultra |
|---|---|---|
| Height | N/A (not specified) | 6.41 in |
| Width | N/A (not specified) | 3.06 in |
| Thickness | N/A (not specified) | 0.33 in |
| Weight | N/A (not specified) | 7.69 oz |
| Water & dust rating | IP68 | IP68/IP69 (winner) |
| Frame | N/A (not specified) | Aluminum |
Display
Nothing to tally in the display section, but plenty to read. The table lists what the Galaxy S26 and the Xiaomi 17 Ultra each use.
Screen size
Galaxy S26: 6.3 in Xiaomi 17 Ultra: 6.9 in A bigger screen makes reading, video and maps more comfortable, while a smaller one is easier to use with one hand and slips into more pockets.
Performance
Xiaomi 17 Ultra leads
This section belongs to the Xiaomi 17 Ultra. In performance, it leads the Galaxy S26 by a margin that’s hard to ignore. The Xiaomi 17 Ultra comes with 4 GB more RAM. Opening a single app, you won’t feel the difference. With lots of tabs, a game and the camera in rotation, the Xiaomi 17 Ultra has more room to work with. Prioritize performance, and the Xiaomi 17 Ultra is where you should land.
RAM
Galaxy S26: 12 GB Xiaomi 17 Ultra: 16 GB More RAM lets a phone keep more apps open in the background, so switching back to them is instant instead of a reload.
Memory & Storage
Xiaomi 17 Ultra leads
Here the Xiaomi 17 Ultra opens up one of its biggest leads in the comparison. On the Xiaomi 17 Ultra, you get 512 GB of base storage instead of 256 GB. Base storage is what you get without paying extra. Photos, videos and apps add up quickly, so more space at the entry price is real value. So if memory & storage tops your list, lean toward the Xiaomi 17 Ultra.
Base storage
Galaxy S26: 256 GB Xiaomi 17 Ultra: 512 GB The Xiaomi 17 Ultra starts with more room, which means fewer “storage full” warnings and less time deleting old videos.
Camera
Too close to call
The Galaxy S26 and the Xiaomi 17 Ultra match each other closely in this area. In short, camera is a draw; the decision lies elsewhere.
Battery & Charging
Xiaomi 17 Ultra leads
The Xiaomi 17 Ultra is the clear pick if battery & charging is what you care about most. In its favor, the Xiaomi 17 Ultra has 40% more battery capacity. Extra capacity also ages better: after a few years of charge cycles, the Xiaomi 17 Ultra has more headroom left. For battery & charging, the Xiaomi 17 Ultra is the one to beat.
Battery capacity
Galaxy S26: 4,300 mAh Xiaomi 17 Ultra: 6,000 mAh Capacity isn’t everything, but when two phones are otherwise close, more milliamp-hours is the simplest endurance advantage there is.
Software & Updates
The software & updates data here comes as names and types, not scores. Check the table to see what each one uses.
Full Specifications
Display
| Spec | Galaxy S26 | Xiaomi 17 Ultra |
|---|---|---|
| Screen size | 6.3 in | 6.9 in |
| Panel type | Dynamic AMOLED 2X | LTPO AMOLED |
| Resolution | N/A (not specified) | 2608 x 1200 |
| Refresh rate | N/A (not specified) | 120 Hz |
| Peak brightness | N/A (not specified) | 3,500 nits |
| Always-on display | Yes | N/A (not specified) |
Performance
| Spec | Galaxy S26 | Xiaomi 17 Ultra |
|---|---|---|
| Chipset | Snapdragon 8 Elite Gen 5 for Galaxy (US) | Snapdragon 8 Elite Gen 5 |
| CPU cores | N/A (not specified) | 8 |
| Process node | N/A (not specified) | 3 nm |
| RAM | 12 GB | 16 GB (winner) |
Memory & Storage
| Spec | Galaxy S26 | Xiaomi 17 Ultra |
|---|---|---|
| Base storage | 256 GB | 512 GB (winner) |
| Max storage | N/A (not specified) | 1 TB |
| microSD slot | No | No |
Camera
| Spec | Galaxy S26 | Xiaomi 17 Ultra |
|---|---|---|
| Main camera | 50 MP | 50 MP |
| Ultra-wide camera | N/A (not specified) | 50 MP |
| Telephoto camera | N/A (not specified) | 200 MP |
| Optical zoom | N/A (not specified) | 4.3× |
| Rear cameras | N/A (not specified) | 3 |
| Front camera | N/A (not specified) | 50 MP |
| Max video | N/A (not specified) | 8K30 |
Battery & Charging
| Spec | Galaxy S26 | Xiaomi 17 Ultra |
|---|---|---|
| Battery capacity | 4,300 mAh | 6,000 mAh (winner) |
| Wired charging | N/A (not specified) | 90 W |
| Wireless charging | N/A (not specified) | 50 W |
| Port | USB-C | USB-C (USB 3.2 Gen 2) |
Software & Updates
| Spec | Galaxy S26 | Xiaomi 17 Ultra |
|---|---|---|
| OS at launch | Android 16 (One UI 8.5) | HyperOS 3 (Android 16) |
| Promised OS updatesManufacturer commitment | 7 years | N/A (not specified) |
Design & Build
| Spec | Galaxy S26 | Xiaomi 17 Ultra |
|---|---|---|
| Height | N/A (not specified) | 6.41 in |
| Width | N/A (not specified) | 3.06 in |
| Thickness | N/A (not specified) | 0.33 in |
| Weight | N/A (not specified) | 7.69 oz |
| Water & dust rating | IP68 | IP68/IP69 (winner) |
| Frame | N/A (not specified) | Aluminum |
“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.
Which One Should You Buy?
Choose the Galaxy S26 if…
- you value compactness over sheer size
- you’re loyal to Samsung and happy with it
Choose the Xiaomi 17 Ultra if…
- you want the bigger battery (6,000 mAh vs 4,300 mAh)
- you want more memory headroom for the years ahead (16 GB vs 12 GB)
- you want more storage without paying for an upgrade (512 GB vs 256 GB)
- you want better protection against water and dust (IP68/IP69 vs IP68)
Also Compared
Frequently Asked Questions
Which is better for most people, the Galaxy S26 or the Xiaomi 17 Ultra?
On the specs compared here, the Xiaomi 17 Ultra makes more sense for most buyers; the Galaxy S26 doesn’t win a single measurable area.
Does the Galaxy S26 last longer on a charge than the Xiaomi 17 Ultra?
The Xiaomi 17 Ultra does better here. It lists 6,000 mAh for battery capacity, while the Galaxy S26 lists 4,300 mAh.
Is the Galaxy S26 bigger than the Xiaomi 17 Ultra?
The Xiaomi 17 Ultra takes that one. With dimensions of 6.41 × 3.06 × 0.33 in, it is larger than the Galaxy S26 (6.3 in).
Does the Galaxy S26 perform better than the Xiaomi 17 Ultra?
The Xiaomi 17 Ultra should be the quicker of the two, with 4 GB more RAM on its side.
Which has more storage, the Galaxy S26 or the Xiaomi 17 Ultra?
Going by the spec sheets, the Xiaomi 17 Ultra has the larger figure: 512 GB, against 256 GB.
Executive Summary
I read both spec sheets (the Galaxy S26’s and the Xiaomi 17 Ultra’s) so you don’t have to. In daily life, I think the first difference you’d notice is 40% more battery capacity, and that goes to the Xiaomi 17 Ultra. There’s a bonus as well: the Xiaomi 17 Ultra has 4 GB more RAM.
A quick self-test: do you care more about the things a spec sheet can’t capture or performance? The first answer means the Galaxy S26, the second means the Xiaomi 17 Ultra.
My pick: the Xiaomi 17 Ultra.
Personal opinion based on the data above. Your priorities may differ.