The OnePlus Nord 4 brings several notable upgrades over its predecessor, the **OnePlus Nord 3**:

1. Camera Improvements: The Nord 4 features a new 50MP Sony LYTIA primary sensor, compared to the Sony IMX 890 sensor in the Nord 3. Although the Nord 4 doesn't include a macro lens like the Nord 3, it still offers a 16MP selfie shooter. This change results in potentially better camera quality, but you'd need to check in-depth reviews for full performance insights.

2. Battery and Charging: The Nord 4 comes with a larger 5,500mAh battery compared to the 5,000mAh cell in the Nord 3. It also supports 100W fast charging, an upgrade from the 80W in the Nord 3, meaning faster charging times and longer battery life.

3. Design and Bui: The Nord 4 is slightly heavier but more comfortable to hold, with a metallic chassis and IP65 water resistance, giving it more durability compared to the Nord 3. This makes the Nord 4 feel more premium and less prone to damage.

4. Display: While the Nord 4 retains the same 6.74-inch AMOLED panel with a 120Hz refresh rate as the Nord 3, it has improved brightness, reaching up to 2,100 nits for HDR content, providing a better viewing experience, especially outdoors.

5. Performance: The Nord 4 is powered by the latest Qualcomm Snapdragon 7+ Gen 3 chipset, offering better performance compared to the Nord 3’s MediaTek Dimensity 9000. The Nord 4 delivers improved gaming and multitasking capabilities while also managing heat more effectively.

6. Software: The Nord 4 runs on Android 14-based OxygenOS out of the box and promises four years of Android updates and six years of security patches, whereas the Nord 3 will only receive up to Android 16 with three years of updates.

Overall, the Nord 4 offers enhancements in battery life, charging speed, design, performance, and long-term software support, making it a substantial upgrade from the Nord 3.