Redmi K90 Ultra vs Xiaomi 18 Fold
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Xiaomi 18 Fold (2026) runs on the Xiaomi XRING O3; launch prices were $420 and $1639. By overall MobileRank rating, the Xiaomi 18 Fold leads — 86/100 vs 73/100 (a 13-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 6000); the main camera is 50 MP vs 200 MP; the Xiaomi 18 Fold is faster in AnTuTu (5,228,014 vs 3,233,695); the Xiaomi 18 Fold is thinner (5.0mm vs 8.2mm).
Profile comparison
Category scores
Redmi K90 Ultra
Xiaomi 18 Fold
What makes Redmi K90 Ultra better?
- Bigger battery: 8550 vs 6000 mAh
- Faster charging: 100W vs 67W
- Higher refresh rate: 165Hz vs 120Hz
- Cheaper at launch: $420 vs $1639
- Longer battery life (78/100 vs 75/100)
- Better display (94/100 vs 79/100)
What makes Xiaomi 18 Fold better?
- Higher AnTuTu: 5228014 vs 3233695
- Better Geekbench Single: 3715 vs 3013
- Better Geekbench Multi: 14213 vs 9287
- Better main camera: 200MP vs 50MP
- Lighter: 219g vs 227g
- Higher performance (99/100 vs 92/100)
- Better camera (85/100 vs 37/100)
- Better portability (64/100 vs 40/100)
Comparison verdict
Comparing the Redmi K90 Ultra vs the Xiaomi 18 Fold, the Xiaomi 18 Fold scores 13 points higher (86/100 vs 73/100). In the "camera" category, the Xiaomi 18 Fold leads (85/100 vs 37/100). Value score: Redmi K90 Ultra — 72/100, Xiaomi 18 Fold — 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, the Xiaomi 18 Fold is a bit better (99/100 vs 92/100). In the "display" category, the Redmi K90 Ultra notably outperforms the Xiaomi 18 Fold (94/100 vs 79/100). In the "camera" category, the Xiaomi 18 Fold significantly outperforms the Redmi K90 Ultra (85/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra and the Xiaomi 18 Fold are nearly equal (78/100 vs 75/100). In the "portability" category, the Xiaomi 18 Fold notably outperforms the Redmi K90 Ultra (64/100 vs 40/100).
Specs comparison
| Specification | Redmi K90 Ultra | Xiaomi 18 Fold | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Xiaomi XRING O3 | |
| AnTuTu | 3233695 | 5228014 | |
| Geekbench Single | 3013 | 3715 | |
| Geekbench Multi | 9287 | 14213 | |
| Display | 6.8" AMOLED | 7.6" LTPO AMOLED | |
| Resolution | 1280x2772 | 1672x2364 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8550 mAh | 6000 mAh | |
| Charging | 100W | 67W | |
| Wireless charging | 0W | 50W | |
| Main camera | 50 MP | 200 MP | |
| Ultrawide | 8 MP | 50 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 20 MP | 16 MP | |
| RAM | 12GB / 16GB | 12GB / 16GB | |
| Storage | 256GB / 512GB | 256GB / 512GB / 1TB | |
| OS | Android 16 | Android 16 | |
| Brightness (peak) | 3500 nits | 4000 nits | |
| NFC | yes | yes | |
| Protection | IP68/IP69 | IP59 | |
| Dimensions | 162.9×77.9×8.2 mm | 159.7×145.1×5.0 mm | |
| Weight | 227 g | 219 g | |
| Launch price | $420 | $1639 |
Camera comparison
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Xiaomi 18 Fold
- Main: 200MP f/1.7
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 16MP
Display comparison
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Xiaomi 18 Fold
- 7.6" LTPO AMOLED
- Resolution: 1672x2364
- Refresh rate: 120 Hz
Battery and charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Xiaomi 18 Fold
- 6000 mAh
- Wired: 67W
- Wireless: 50W
Overall performance score
We compared Redmi K90 Ultra and Xiaomi 18 Fold, covering their specs and all relevant benchmarks.
Xiaomi 18 Fold leads Redmi K90 Ultra by 38.1% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $1219. Redmi K90 Ultra was $1219 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Xiaomi 18 Fold is a bit better (99/100 vs 92/100).
display
In the "display" category, the Redmi K90 Ultra notably outperforms the Xiaomi 18 Fold (94/100 vs 79/100).
camera
In the "camera" category, the Xiaomi 18 Fold significantly outperforms the Redmi K90 Ultra (85/100 vs 37/100).
battery
In the "battery" category, the Redmi K90 Ultra and the Xiaomi 18 Fold are nearly equal (78/100 vs 75/100).
portability
In the "portability" category, the Xiaomi 18 Fold notably outperforms the Redmi K90 Ultra (64/100 vs 40/100).
Frequently asked questions
Which is better: the Redmi K90 Ultra or the Xiaomi 18 Fold?
The Xiaomi 18 Fold is noticeably better than the Redmi K90 Ultra — the overall rating gap is 13 points.
What is the rating of the Redmi K90 Ultra and the Xiaomi 18 Fold?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Xiaomi 18 Fold — 86/100.
Which has the better camera: the Redmi K90 Ultra or the Xiaomi 18 Fold?
The Xiaomi 18 Fold leads on camera score (85/100 vs 37/100).
Which is more powerful: the Redmi K90 Ultra or the Xiaomi 18 Fold?
The Xiaomi 18 Fold leads on performance (99/100 vs 92/100).
Should you choose the Redmi K90 Ultra over the Xiaomi 18 Fold?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life. The Xiaomi 18 Fold is a better fit for gamers and power users, mobile photography enthusiasts, those who care about battery life, budget-conscious buyers.