Realme C100x vs Xiaomi 15 Ultra
The Realme C100x (2026) runs on the Unisoc T7250, while the Xiaomi 15 Ultra (2025) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $175 and $999. By overall MobileRank rating, the Xiaomi 15 Ultra leads — 85/100 vs 42/100 (a 43-point difference). Key differences: the Realme C100x has the bigger battery (8000 mAh vs 6000).
Realme C100x
Xiaomi 15 Ultra
- Bigger battery: 8000 vs 6000 mAh
- Lighter: 219g vs 225g
- Cheaper at launch: $175 vs $999
- Better portability (40/100 vs 29/100)
- Better Geekbench Single: 3050 vs 600
- Better Geekbench Multi: 10200 vs 1800
- Faster charging: 90W vs 45W
- Higher performance (92/100 vs 32/100)
- Better camera (87/100 vs 30/100)
- Longer battery life (80/100 vs 75/100)
- Better display (90/100 vs 55/100)
Comparing the Realme C100x vs the Xiaomi 15 Ultra, the Xiaomi 15 Ultra scores 43 points higher (85/100 vs 42/100). In the "performance" category, the Xiaomi 15 Ultra leads (92/100 vs 32/100). In the "camera" category, the Xiaomi 15 Ultra leads (87/100 vs 30/100). Value score: Realme C100x — 54/100, Xiaomi 15 Ultra — 82/100; it is biased by price level, so it should not be compared directly between devices at different prices. In the "performance" category, the Xiaomi 15 Ultra significantly outperforms the Realme C100x (92/100 vs 32/100). In the "display" category, the Xiaomi 15 Ultra significantly outperforms the Realme C100x (90/100 vs 55/100). In the "camera" category, the Xiaomi 15 Ultra significantly outperforms the Realme C100x (87/100 vs 30/100). In the "battery" category, the Xiaomi 15 Ultra is a bit better (80/100 vs 75/100). In the "portability" category, the Realme C100x is a bit better (40/100 vs 29/100).
| Specification | Realme C100x | Xiaomi 15 Ultra | |
|---|---|---|---|
| Processor | Unisoc T7250 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | — | 3030376 | |
| Geekbench Single | 600 | 3050 | |
| Geekbench Multi | 1800 | 10200 | |
| Display | 6.8" IPS LCD | 6.7" LTPO AMOLED | |
| Resolution | 720x1570 | 3200x1440 | |
| Refresh rate | 120 Hz | 120 Hz | |
| Battery | 8000 mAh | 6000 mAh | |
| Charging | 45W | 90W | |
| Wireless charging | — | 50W | |
| DXOMark (camera) | — | 159 | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 0 MP | 50 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 5 MP | 32 MP | |
| RAM | 4GB / 6GB | 16GB | |
| Storage | 64GB / 128GB / 256GB | 256GB / 512GB / 1TB | |
| OS | Android 16 | Android 15 / HyperOS 2 | |
| Brightness (peak) | 900 nits | 3200 nits | |
| NFC | yes | yes | |
| Protection | IP64 | IP68 | |
| Dimensions | — | 161.3×75.3×9.4 mm | |
| Weight | 219 g | 225 g | |
| Launch price | $175 | $999 |
Realme C100x
- Main: 50MP f/f/1.8
- Front: 5MP
Xiaomi 15 Ultra
- Main: 50MP f/f/1.63
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Realme C100x
- 6.8" IPS LCD
- Resolution: 720x1570
- Refresh rate: 120 Hz
Xiaomi 15 Ultra
- 6.7" LTPO AMOLED
- Resolution: 3200x1440
- Refresh rate: 120 Hz
Realme C100x
- 8000 mAh
- Wired: 45W
- Wireless charging: no data
Xiaomi 15 Ultra
- 6000 mAh
- NanoReview test: web browsing 12:19 hrs, total 30:03 hrs
- Wired: 90W
- Wireless: 50W
Launch price difference: $824. Realme C100x was $824 cheaper at launch.
performance
In the "performance" category, the Xiaomi 15 Ultra significantly outperforms the Realme C100x (92/100 vs 32/100).
display
In the "display" category, the Xiaomi 15 Ultra significantly outperforms the Realme C100x (90/100 vs 55/100).
camera
In the "camera" category, the Xiaomi 15 Ultra significantly outperforms the Realme C100x (87/100 vs 30/100).
battery
In the "battery" category, the Xiaomi 15 Ultra is a bit better (80/100 vs 75/100).
portability
In the "portability" category, the Realme C100x is a bit better (40/100 vs 29/100).
Which is better: the Realme C100x or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra significantly outperforms the Realme C100x by 43 points (85/100 vs 42/100).
What is the rating of the Realme C100x and the Xiaomi 15 Ultra?
The Realme C100x has a MobileRank rating of 42/100, the Xiaomi 15 Ultra — 85/100.
Which has the better camera: the Realme C100x or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra leads on camera score (87/100 vs 30/100).
Which is more powerful: the Realme C100x or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra leads on performance (92/100 vs 32/100).
Should you choose the Realme C100x over the Xiaomi 15 Ultra?
The Realme C100x is a better fit for 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.