Redmi K90 Ultra vs Xiaomi 15 Ultra
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Xiaomi 15 Ultra (2025) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $420 and $999. By overall MobileRank rating, the Xiaomi 15 Ultra leads — 85/100 vs 73/100 (a 12-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 6000); the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 3,030,376); the Redmi K90 Ultra is thinner (8.2mm vs 9.4mm).
Profile comparison
Category scores
Redmi K90 Ultra
Xiaomi 15 Ultra
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 3030376
- Bigger battery: 8550 vs 6000 mAh
- Faster charging: 100W vs 90W
- Higher refresh rate: 165Hz vs 120Hz
- Cheaper at launch: $420 vs $999
- Better display (94/100 vs 90/100)
- Better portability (40/100 vs 29/100)
What makes Xiaomi 15 Ultra better?
- Better Geekbench Single: 3050 vs 3013
- Better Geekbench Multi: 10200 vs 9287
- Lighter: 225g vs 227g
- Better camera (87/100 vs 37/100)
- Longer battery life (80/100 vs 78/100)
Comparison verdict
Comparing the Redmi K90 Ultra vs the Xiaomi 15 Ultra, the Xiaomi 15 Ultra scores 12 points higher (85/100 vs 73/100). In the "camera" category, the Xiaomi 15 Ultra leads (87/100 vs 37/100). Value score: Redmi K90 Ultra — 72/100, Xiaomi 15 Ultra — 80/100; it shows how far a model sits above or below the usual level for its price, and is not part of the overall rating. In the "performance" category, both devices are on the same level — 92/100. In the "display" category, the Redmi K90 Ultra and the Xiaomi 15 Ultra are nearly equal (94/100 vs 90/100). In the "camera" category, the Xiaomi 15 Ultra significantly outperforms the Redmi K90 Ultra (87/100 vs 37/100). In the "battery" category, the Xiaomi 15 Ultra and the Redmi K90 Ultra are nearly equal (80/100 vs 78/100). In the "portability" category, the Redmi K90 Ultra is a bit better (40/100 vs 29/100).
Specs comparison
| Specification | Redmi K90 Ultra | Xiaomi 15 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 3233695 | 3030376 | |
| Geekbench Single | 3013 | 3050 | |
| Geekbench Multi | 9287 | 10200 | |
| Display | 6.8" AMOLED | 6.7" LTPO AMOLED | |
| Resolution | 1280x2772 | 3200x1440 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8550 mAh | 6000 mAh | |
| Charging | 100W | 90W | |
| Wireless charging | 0W | 50W | |
| DXOMark (camera) | — | 159 | |
| 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 | 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 | 161.3×75.3×9.4 mm | |
| Weight | 227 g | 225 g | |
| Launch price | $420 | $999 |
Camera comparison
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Xiaomi 15 Ultra
- Main: 50MP f/1.63
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Display comparison
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Xiaomi 15 Ultra
- 6.7" LTPO AMOLED
- Resolution: 3200x1440
- Refresh rate: 120 Hz
Battery and charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Xiaomi 15 Ultra
- 6000 mAh
- NanoReview test: web browsing 12:19 hrs, total 30:03 hrs
- Wired: 90W
- Wireless: 50W
Overall performance score
We compared Redmi K90 Ultra and Xiaomi 15 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Xiaomi 15 Ultra by 6.7% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $579. Redmi K90 Ultra was $579 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, both devices are on the same level — 92/100.
display
In the "display" category, the Redmi K90 Ultra and the Xiaomi 15 Ultra are nearly equal (94/100 vs 90/100).
camera
In the "camera" category, the Xiaomi 15 Ultra significantly outperforms the Redmi K90 Ultra (87/100 vs 37/100).
battery
In the "battery" category, the Xiaomi 15 Ultra and the Redmi K90 Ultra are nearly equal (80/100 vs 78/100).
portability
In the "portability" category, the Redmi K90 Ultra is a bit better (40/100 vs 29/100).
Frequently asked questions
Which is better: the Redmi K90 Ultra or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra is noticeably better than the Redmi K90 Ultra — the overall rating gap is 12 points.
What is the rating of the Redmi K90 Ultra and the Xiaomi 15 Ultra?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Xiaomi 15 Ultra — 85/100.
Which has the better camera: the Redmi K90 Ultra or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra leads on camera score (87/100 vs 37/100).
Should you choose the Redmi K90 Ultra over the Xiaomi 15 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life. The Xiaomi 15 Ultra is a better fit for gamers and power users, mobile photography enthusiasts, those who care about battery life, budget-conscious buyers.