Redmi K90 Ultra vs Xiaomi 15
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Xiaomi 15 (2025) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $420 and $635. By overall MobileRank rating, the Xiaomi 15 leads — 82/100 vs 73/100 (a 9-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 5240); the Redmi K90 Ultra is faster in AnTuTu (3,119,308 vs 2,923,262); the Xiaomi 15 is noticeably lighter (191g vs 227g).
Redmi K90 Ultra
Xiaomi 15
- Higher AnTuTu: 3119308 vs 2923262
- Better Geekbench Multi: 9494 vs 9147
- Bigger battery: 8550 vs 5240 mAh
- Faster charging: 100W vs 90W
- Higher refresh rate: 165Hz vs 120Hz
- Cheaper at launch: $420 vs $635
- Higher performance (92/100 vs 91/100)
- Longer battery life (78/100 vs 77/100)
- Better display (94/100 vs 85/100)
- Better Geekbench Single: 3092 vs 3041
- Lighter: 191g vs 227g
- Better camera (78/100 vs 37/100)
- Better portability (60/100 vs 40/100)
Comparing the Redmi K90 Ultra vs the Xiaomi 15, the Xiaomi 15 scores 9 points higher (82/100 vs 73/100). In the "camera" category, the Xiaomi 15 leads (78/100 vs 37/100). Value score: Redmi K90 Ultra — 82/100, Xiaomi 15 — 76/100; it is biased by price level, so it should not be compared directly between devices at different prices. In the "performance" category, the Redmi K90 Ultra and the Xiaomi 15 are nearly equal (92/100 vs 91/100). In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 85/100). In the "camera" category, the Xiaomi 15 significantly outperforms the Redmi K90 Ultra (78/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra and the Xiaomi 15 are nearly equal (78/100 vs 77/100). In the "portability" category, the Xiaomi 15 notably outperforms the Redmi K90 Ultra (60/100 vs 40/100).
| Specification | Redmi K90 Ultra | Xiaomi 15 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 3119308 | 2923262 | |
| Geekbench Single | 3041 | 3092 | |
| Geekbench Multi | 9494 | 9147 | |
| Display | 6.8" AMOLED | 6.4" LTPO AMOLED | |
| Resolution | 1280x2772 | 2670x1200 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8550 mAh | 5240 mAh | |
| Charging | 100W | 90W | |
| Wireless charging | 0W | 50W | |
| DXOMark (camera) | — | 147 | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 8 MP | 50 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 20 MP | 32 MP | |
| RAM | 12GB / 16GB | 12GB / 16GB | |
| Storage | 256GB / 512GB | 256GB / 512GB / 1TB | |
| OS | Android 16 | Android 15 / HyperOS 2 | |
| Brightness (peak) | 3500 nits | 3200 nits | |
| NFC | yes | yes | |
| Protection | IP68/IP69 | IP68 | |
| Dimensions | 162.9×77.9×8.2 mm | 152.3×71.2×8.4 mm | |
| Weight | 227 g | 191 g | |
| Launch price | $420 | $635 |
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Xiaomi 15
- Main: 50MP f/f/1.6
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Xiaomi 15
- 6.4" LTPO AMOLED
- Resolution: 2670x1200
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Xiaomi 15
- 5240 mAh
- NanoReview test: web browsing 13:20 hrs, total 31:54 hrs
- Wired: 90W
- Wireless: 50W
We compared Redmi K90 Ultra and Xiaomi 15, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Xiaomi 15 by 6.7% in our overall performance rating.
Launch price difference: $215. Redmi K90 Ultra was $215 cheaper at launch.
performance
In the "performance" category, the Redmi K90 Ultra and the Xiaomi 15 are nearly equal (92/100 vs 91/100).
display
In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 85/100).
camera
In the "camera" category, the Xiaomi 15 significantly outperforms the Redmi K90 Ultra (78/100 vs 37/100).
battery
In the "battery" category, the Redmi K90 Ultra and the Xiaomi 15 are nearly equal (78/100 vs 77/100).
portability
In the "portability" category, the Xiaomi 15 notably outperforms the Redmi K90 Ultra (60/100 vs 40/100).
Which is better: the Redmi K90 Ultra or the Xiaomi 15?
The Xiaomi 15 edges out the Redmi K90 Ultra by just 9 points — the two devices are very close in overall level.
What is the rating of the Redmi K90 Ultra and the Xiaomi 15?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Xiaomi 15 — 82/100.
Which has the better camera: the Redmi K90 Ultra or the Xiaomi 15?
The Xiaomi 15 leads on camera score (78/100 vs 37/100).
Should you choose the Redmi K90 Ultra over the Xiaomi 15?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers. The Xiaomi 15 is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.