Redmi K90 Ultra vs Vivo S15
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Vivo S15 (2022) runs on the Qualcomm Snapdragon 870 5G. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 57/100 (a 16-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 4500); the main camera is 50 MP vs 64 MP; the Redmi K90 Ultra is faster in AnTuTu (3,119,308 vs 1,010,069); the Vivo S15 is noticeably lighter (197g vs 227g).
Redmi K90 Ultra
Vivo S15
- Higher AnTuTu: 3119308 vs 1010069
- Better Geekbench Single: 3041 vs 1298
- Better Geekbench Multi: 9494 vs 3520
- Bigger battery: 8550 vs 4500 mAh
- Faster charging: 100W vs 66W
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (92/100 vs 61/100)
- Longer battery life (78/100 vs 42/100)
- Better display (94/100 vs 80/100)
- Better main camera: 64MP vs 50MP
- Lighter: 197g vs 227g
- Better camera (48/100 vs 37/100)
- Better portability (61/100 vs 40/100)
Comparing the Redmi K90 Ultra vs the Vivo S15, the Redmi K90 Ultra scores 16 points higher (73/100 vs 57/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 61/100). In the "camera" category, the Vivo S15 leads (48/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 42/100). In the "performance" category, the Redmi K90 Ultra significantly outperforms the Vivo S15 (92/100 vs 61/100). In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 80/100). In the "camera" category, the Vivo S15 is a bit better (48/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Vivo S15 (78/100 vs 42/100). In the "portability" category, the Vivo S15 notably outperforms the Redmi K90 Ultra (61/100 vs 40/100).
| Specification | Redmi K90 Ultra | Vivo S15 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 870 5G | |
| AnTuTu | 3119308 | 1010069 | |
| Geekbench Single | 3041 | 1298 | |
| Geekbench Multi | 9494 | 3520 | |
| Display | 6.8" AMOLED | 6.6" AMOLED | |
| Resolution | 1280x2772 | 1080x2400 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8550 mAh | 4500 mAh | |
| Charging | 100W | 66W | |
| Main camera | 50 MP | 64 MP | |
| Ultrawide | 8 MP | 8 MP | |
| Front camera | 20 MP | 32 MP | |
| RAM | 12GB / 16GB | 8GB / 12GB | |
| Storage | 256GB / 512GB | 128GB / 256GB | |
| OS | Android 16 | Android 12, Origin OS Ocean | |
| Brightness (peak) | 3500 nits | 1300 nits | |
| NFC | yes | yes | |
| Protection | IP68/IP69 | — | |
| Dimensions | 162.9×77.9×8.2 mm | 161.1×74.3×8.0 mm | |
| Weight | 227 g | 197 g | |
| Price | $420 | — |
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Vivo S15
- Main: 64MP f/f/1.9
- Ultrawide: 8MP
- Front: 32MP
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Vivo S15
- 6.6" AMOLED
- Resolution: 1080x2400
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Vivo S15
- 4500 mAh
- Wired: 66W
- No wireless charging
We compared Redmi K90 Ultra and Vivo S15, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Vivo S15 by 208.8% in our overall performance rating.
Vivo S15
Price unknownperformance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Vivo S15 (92/100 vs 61/100).
display
In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 80/100).
camera
In the "camera" category, the Vivo S15 is a bit better (48/100 vs 37/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Vivo S15 (78/100 vs 42/100).
portability
In the "portability" category, the Vivo S15 notably outperforms the Redmi K90 Ultra (61/100 vs 40/100).
Which is better: the Redmi K90 Ultra or the Vivo S15?
The Redmi K90 Ultra is noticeably better than the Vivo S15 — the overall rating gap is 16 points.
What is the rating of the Redmi K90 Ultra and the Vivo S15?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Vivo S15 — 57/100.
Which has the better camera: the Redmi K90 Ultra or the Vivo S15?
The Vivo S15 leads on camera score (48/100 vs 37/100).
Which is more powerful: the Redmi K90 Ultra or the Vivo S15?
The Redmi K90 Ultra leads on performance (92/100 vs 61/100).
Should you choose the Redmi K90 Ultra over the Vivo S15?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life. The Vivo S15 is a better fit for active users.