The iPhone 18 Pro series is anticipated to maintain the same fundamental design as its predecessors, which will naturally extend to its dimensions. According to a new update from tipster Ice Universe, the iPhone 18 Pro Max (and likely the 18 Pro) will measure 8.75 mm. This thickness is identical to that of the iPhone 17 Pro models, which is not unexpected.

The tipster further notes that Apple’s ongoing focus on its inaugural foldable phone, referred to as the iPhone Ultra, has resulted in the 18 Pro series lacking many innovative features. This is understandable, as the Ultra, or whatever its final name may be, is set to occupy the highest tier within the iPhone lineup, and Apple will likely strive for optimal execution in its development.
Source (in Chinese)