Realme C100 5G vs Xiaomi 15 Ultra
The Realme C100 5G (2026) runs on the Dimensity 6300, while the Xiaomi 15 Ultra (2025) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $210 and $999. By overall MobileRank rating, the Xiaomi 15 Ultra leads — 85/100 vs 45/100 (a 40-point difference). Key differences: the Realme C100 5G has the bigger battery (7000 mAh vs 6000); the Xiaomi 15 Ultra is faster in AnTuTu (3,030,376 vs 524,785); the Xiaomi 15 Ultra has NFC for contactless payments, the Realme C100 5G doesn't.
Realme C100 5G
Xiaomi 15 Ultra
- Bigger battery: 7000 vs 6000 mAh
- Higher refresh rate: 144Hz vs 120Hz
- Lighter: 224g vs 225g
- Cheaper at launch: $210 vs $999
- Better portability (36/100 vs 29/100)
- Higher AnTuTu: 3030376 vs 524785
- Better Geekbench Single: 3050 vs 771
- Better Geekbench Multi: 10200 vs 1980
- Faster charging: 90W vs 45W
- Higher performance (92/100 vs 43/100)
- Better camera (87/100 vs 30/100)
- Longer battery life (80/100 vs 60/100)
- Better display (90/100 vs 65/100)
Comparing the Realme C100 5G vs the Xiaomi 15 Ultra, the Xiaomi 15 Ultra scores 40 points higher (85/100 vs 45/100). In the "performance" category, the Xiaomi 15 Ultra leads (92/100 vs 43/100). In the "camera" category, the Xiaomi 15 Ultra leads (87/100 vs 30/100). In the "battery" category, the Xiaomi 15 Ultra leads (80/100 vs 60/100). Value score: Realme C100 5G — 50/100, 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 C100 5G (92/100 vs 43/100). In the "display" category, the Xiaomi 15 Ultra notably outperforms the Realme C100 5G (90/100 vs 65/100). In the "camera" category, the Xiaomi 15 Ultra significantly outperforms the Realme C100 5G (87/100 vs 30/100). In the "battery" category, the Xiaomi 15 Ultra notably outperforms the Realme C100 5G (80/100 vs 60/100). In the "portability" category, the Realme C100 5G is a bit better (36/100 vs 29/100).
| Specification | Realme C100 5G | Xiaomi 15 Ultra | |
|---|---|---|---|
| Processor | Dimensity 6300 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 524785 | 3030376 | |
| Geekbench Single | 771 | 3050 | |
| Geekbench Multi | 1980 | 10200 | |
| Display | 6.8" IPS LCD | 6.7" LTPO AMOLED | |
| Resolution | 720x1570 | 3200x1440 | |
| Refresh rate | 144 Hz | 120 Hz | |
| Battery | 7000 mAh | 6000 mAh | |
| Charging | 45W | 90W | |
| Wireless charging | 0W | 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 | 128GB / 256GB | 256GB / 512GB / 1TB | |
| OS | Android 16 / realme UI 7.0 | Android 15 / HyperOS 2 | |
| Brightness (peak) | 900 nits | 3200 nits | |
| NFC | no | yes | |
| Protection | IP64 | IP68 | |
| Dimensions | 166.8×78.2×8.9 mm | 161.3×75.3×9.4 mm | |
| Weight | 224 g | 225 g | |
| Launch price | $210 | $999 |
Realme C100 5G
- Main: 50MP f/f/1.8
- Front: 5MP
Xiaomi 15 Ultra
- Main: 50MP f/f/1.63
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Realme C100 5G
- 6.8" IPS LCD
- Resolution: 720x1570
- Refresh rate: 144 Hz
Xiaomi 15 Ultra
- 6.7" LTPO AMOLED
- Resolution: 3200x1440
- Refresh rate: 120 Hz
Realme C100 5G
- 7000 mAh
- Wired: 45W
- No wireless charging
Xiaomi 15 Ultra
- 6000 mAh
- NanoReview test: web browsing 12:19 hrs, total 30:03 hrs
- Wired: 90W
- Wireless: 50W
We compared Realme C100 5G and Xiaomi 15 Ultra, covering their specs and all relevant benchmarks.
Xiaomi 15 Ultra leads Realme C100 5G by 82.7% in our overall performance rating.
Launch price difference: $789. Realme C100 5G was $789 cheaper at launch.
performance
In the "performance" category, the Xiaomi 15 Ultra significantly outperforms the Realme C100 5G (92/100 vs 43/100).
display
In the "display" category, the Xiaomi 15 Ultra notably outperforms the Realme C100 5G (90/100 vs 65/100).
camera
In the "camera" category, the Xiaomi 15 Ultra significantly outperforms the Realme C100 5G (87/100 vs 30/100).
battery
In the "battery" category, the Xiaomi 15 Ultra notably outperforms the Realme C100 5G (80/100 vs 60/100).
portability
In the "portability" category, the Realme C100 5G is a bit better (36/100 vs 29/100).
Which is better: the Realme C100 5G or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra significantly outperforms the Realme C100 5G by 40 points (85/100 vs 45/100).
What is the rating of the Realme C100 5G and the Xiaomi 15 Ultra?
The Realme C100 5G has a MobileRank rating of 45/100, the Xiaomi 15 Ultra — 85/100.
Which has the better camera: the Realme C100 5G or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra leads on camera score (87/100 vs 30/100).
Which is more powerful: the Realme C100 5G or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra leads on performance (92/100 vs 43/100).
Should you choose the Realme C100 5G over the Xiaomi 15 Ultra?
The Realme C100 5G is a better fit for everyday use. 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.