Xiaomi Mix 4 vs OnePlus 9 Pro: A Deep Dive into Flagship Features
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🏆 Quick Verdict
For users prioritizing charging speed and a truly innovative display, the Xiaomi Mix 4 is the clear winner. However, the OnePlus 9 Pro offers a more polished software experience and a consistently excellent camera, making it ideal for photography enthusiasts.
| PHONES | ||
|---|---|---|
| Phone Names | Xiaomi Mix 4 | OnePlus 9 Pro |
| Network | ||
|---|---|---|
| 2G bands | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G bands | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 | HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100 |
| 4G bands | 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 34, 38, 39, 40, 41, 42 | 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 66 - EU |
| 5G bands | 1, 3, 5, 8, 28, 41, 77, 78, 79 SA/NSA/Sub6 | 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 78 SA/NSA - EU |
| Speed | HSPA, LTE, 5G | HSPA 42.2/5.76 Mbps, LTE Cat20 2000/200 Mbps, 5G |
| Technology | GSM / CDMA / HSPA / EVDO / LTE / 5G | GSM / CDMA / HSPA / LTE / 5G |
| CDMA2000 1xEV-DO | 1, 3, 28, 41, 78, 79 SA/NSA - CN | |
| Launch | ||
|---|---|---|
| Announced | 2021, August 10 | 2021, March 23 |
| Status | Available. Released 2021, August 16 | Available. Released 2021, March 30 |
| Body | ||
|---|---|---|
| Build | Glass front (Gorilla Glass Victus), ceramic back, aluminum frame | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame |
| Dimensions | 162.6 x 75.4 x 8 mm (6.40 x 2.97 x 0.31 in) | 163.2 x 73.6 x 8.7 mm (6.43 x 2.90 x 0.34 in) |
| SIM | Nano-SIM + Nano-SIM | · Nano-SIM· Nano-SIM + Nano-SIM |
| Weight | 225 g (7.94 oz) | 197 g (6.95 oz) |
| IP53, dust and splash resistant | IP68 dust/water resistant (up to 1.5m for 30 min) | |
| Display | ||
|---|---|---|
| Protection | Corning Gorilla Glass Victus | Corning Gorilla Glass 5 |
| Resolution | 1080 x 2400 pixels, 20:9 ratio (~395 ppi density) | 1440 x 3216 pixels, 20:9 ratio (~525 ppi density) |
| Size | 6.67 inches, 107.4 cm2 (~87.6% screen-to-body ratio) | 6.7 inches, 108.4 cm2 (~90.3% screen-to-body ratio) |
| Type | AMOLED, 1B colors, 120Hz, HDR10+, Dolby Vision, 800 nits (HBM) | LTPO Fluid2 AMOLED, 1B colors, 120Hz, HDR10+, 1300 nits (peak) |
| - | Always-on display | |
| Platform | ||
|---|---|---|
| CPU | Octa-core (1x2.99 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) | Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55 |
| Chipset | Qualcomm SM8350 Snapdragon 888+ 5G (5 nm) | Qualcomm SM8350 Snapdragon 888 5G (5 nm) |
| GPU | Adreno 660 | Adreno 660 |
| OS | Android 11, MIUI 12.5 | Android 11, upgradable to Android 14, OxygenOS 14 |
| Memory | ||
|---|---|---|
| Card slot | No | No |
| Internal | 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM, 512GB 12GB RAM | 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM |
| UFS 3.1 | UFS 3.1 | |
| Main Camera | ||
|---|---|---|
| Features | Laser AF, color spectrum sensor, Dual-LED flash, HDR, panorama | Laser AF, color spectrum sensor, Hasselblad Color Calibration, dual-LED flash, HDR, panorama |
| Quad | - | 48 MP, f/1.8, 23mm (wide), 1/1.43", 1.12µm, multi-directional PDAF, OIS 8 MP, f/2.4, 77mm (telephoto), 1.0µm, PDAF, OIS, 3.3x optical zoom 50 MP, f/2.2, 14mm (ultrawide), 1/1.56", 1.0µm, AF 2 MP, f/2.4, (monochrome) |
| Single | 20 MP, 27mm (wide), 1/3.4", 0.8µm, under display | 16 MP, f/2.4, (wide), 1/3.06", 1.0µm |
| Triple | 108 MP, f/1.9, 24mm (wide), 1/1.33", 0.8µm, PDAF, OIS 8 MP, f/4.1, 120mm (periscope telephoto), PDAF, OIS, 5x optical zoom 13 MP, f/2.2, 12mm, 123˚ (ultrawide), 1/3.06", 1.12µm | - |
| Video | 8K@24fps, 4K@30/60fps, 1080p@30/60/120/480fps; gyro-EIS, HDR10+ | 8K@30fps, 4K@30/60/120fps, 1080p@30/60/240fps, Auto HDR, gyro-EIS |
| Selfie camera | ||
|---|---|---|
| Features | HDR | HDR |
| Single | 20 MP, 27mm (wide), 1/3.4", 0.8µm, under display | 16 MP, f/2.4, (wide), 1/3.06", 1.0µm |
| Video | 1080p@30fps | 1080p@30fps, gyro-EIS |
| Sound | ||
|---|---|---|
| 3.5mm jack | No | No |
| 35mm jack | No | No |
| Loudspeaker | Yes, with stereo speakers | Yes, with stereo speakers |
| 24-bit/192kHz audio Tuned by Harman Kardon | 24-bit/192kHz audio | |
| Comms | ||
|---|---|---|
| Bluetooth | 5.2, A2DP, LE, aptX HD | 5.2, A2DP, LE, aptX HD |
| Infrared port | Yes | - |
| NFC | Yes | Yes |
| Positioning | GPS (L1+L5), GLONASS (G1), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5) | GPS (L1+L5), GLONASS (G1), BDS (B1), GALILEO (E1+E5a) |
| Radio | No | No |
| USB | USB Type-C 2.0 | USB Type-C 3.1, OTG |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct | Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct, DLNA |
| Features | ||
|---|---|---|
| Sensors | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass |
| Ultra Wideband (UWB) support | - | |
| Battery | ||
|---|---|---|
| Charging | 120W wired, PD3.0, QC4, 100% in 15 min 50W wireless, 100% in 28 min | 65W wired, PD, 100% in 29 min 50W wireless, 100% in 43 min 5W reverse wireless |
| Type | Li-Po 4500 mAh | Li-Po 4500 mAh |
| Misc | ||
|---|---|---|
| Colors | Ceramic Black, Ceramic White, Shadow Gray | Morning Mist, Forest Green, Stellar Black |
| Models | 2106118C | LE2121, LE2125, LE2123, LE2120, LE2127 |
| Price | About 660 EUR | € 246.17 / $ 264.95 / £ 287.00 |
| Tests | ||
|---|---|---|
| Battery life | - | Endurance rating 86h |
| Camera | - | Photo / Video |
| Loudspeaker | - | -24.1 LUFS (Very good) |
Xiaomi Mix 4
- Blazing-fast 120W wired charging
- Innovative under-display camera
- Slightly faster processor (Snapdragon 888+)
- Software experience may be less refined
- Camera details are currently limited
OnePlus 9 Pro
- Hasselblad-tuned camera system
- Polished and stable software experience
- Excellent display brightness and color accuracy
- Slower charging speeds
- Standard camera cutout (notch or punch-hole)
Display Comparison
The OnePlus 9 Pro boasts a measured peak brightness of 859 nits, providing excellent visibility outdoors. However, the Xiaomi Mix 4, while lacking specific brightness data, is expected to be competitive. The key differentiator lies in the Mix 4’s under-display camera, eliminating the notch or punch-hole. Both devices likely utilize LTPO displays for adaptive refresh rates, conserving battery life. The absence of detailed color accuracy data for the Mix 4 makes a direct comparison difficult, but OnePlus’s display is known for its color calibration.
Camera Comparison
The OnePlus 9 Pro’s camera system, co-developed with Hasselblad, is a significant strength. While specific sensor details are missing for the Mix 4, the OnePlus 9 Pro’s focus on color accuracy and dynamic range is well-documented. Both phones offer photo and video capabilities, but the OnePlus 9 Pro’s Hasselblad tuning provides a distinct advantage in image processing. The absence of detailed camera specs for the Mix 4 makes a direct sensor size comparison impossible, but the OnePlus 9 Pro’s system is known for its versatility and consistent performance.
Performance
Both phones are powered by the Qualcomm Snapdragon 888 series, but the Mix 4 features the 888+ variant. The 888+ boasts a slightly higher peak CPU clock speed (2.99 GHz Cortex-X1 vs 2.84 GHz on the 9 Pro), potentially offering a marginal performance boost in CPU-intensive tasks. Both utilize the same CPU core configuration (1x Cortex-X1, 3x Cortex-A78, 4x Cortex-A55). While both use 5nm fabrication, the 888+’s refinements may lead to slightly better thermal management. Both devices likely employ LPDDR5 RAM, but the Mix 4’s faster processor could benefit from faster RAM speeds if implemented.
Battery Life
Both phones offer 50W wireless charging, but the Mix 4 dramatically outpaces the 9 Pro with 120W wired charging, achieving a full charge in just 15 minutes compared to the 9 Pro’s 29 minutes. The OnePlus 9 Pro has an endurance rating of 86h, suggesting good battery optimization. The Mix 4’s faster charging partially mitigates any potential capacity disadvantage, allowing for quick top-ups throughout the day. The Mix 4’s 50W wireless charging (28 minutes to full) is also faster than the OnePlus 9 Pro’s (43 minutes).
Buying Guide
Buy the Xiaomi Mix 4 if you need the absolute fastest charging available, are intrigued by the under-display camera technology, and prioritize raw speed. Buy the OnePlus 9 Pro if you prefer a more refined and stable software experience, value Hasselblad's color science in photography, and appreciate a proven track record of consistent performance.