I tested the iPhone 18 Pro Max vs. iPhone 15 Pro Max side-by-side: Is it time to upgrade?

Key Points:

• The iPhone 18 Pro Max offers significant upgrades over the iPhone 15 Pro Max, including a larger 48MP triple-camera system with a mechanical variable aperture, improved video capabilities, and a wider field of view on the front camera.
• Despite the hardware improvements, the iPhone 15 Pro Max holds its own in most photo scenarios, delivering comparable image quality except in very low-light conditions and in zoom performance at higher magnifications.
• The iPhone 18 Pro Max features a substantially larger battery (5,391 mAh vs. 4,422 mAh) and improved power efficiency, resulting in over 4 hours longer battery life and faster charging speeds compared to the iPhone 15 Pro Max.
• Performance-wise, the iPhone 18 Pro Max’s A20 Pro chip delivers a major leap in CPU and graphics power, with up to 184% better graphics performance, aided by a redesigned cooling system absent in the 15 Pro Max.
• While software and AI features are largely similar due to iOS 27 support on both devices, the iPhone 18 Pro Max benefits from a larger, brighter display and enhanced multitasking capabilities with Dynamic Island, making it a compelling upgrade for power users.