The iPhone 15 Pro & Pro Max support 10Gb/s USB-C data transfer

The iPhone 15 & 15 Pro lineups support USB-C, but the Pro lineup supports 10Gb/s transfer speeds and will include a USB 2.0 cable in the box.
While the new iPhone 15 & 15 Pro lineups support USB-C, the Pro lineup supports USB 3.2 Gen 1 transfer speeds and will include a USB 2.0 cable in the box.

iPhone 15 pro - USB-C definitely NOT operating at USB 3.2 gen 1

Apple unveils iPhone 15 Pro and iPhone 15 Pro Max - Apple (LI)

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Apple iPhone 15 Pro Deals and Phone Contracts

240W USB C to USB C Cable 3.3FT 2 Pack 10Gbps Data

Apple iPhone 15 Pro Max 512GB White Titanium (Verizon) MU6C3LL/A

100W USB C to USB C 3.1 Gen 2 Cable 10Gbps Data Transfer, 100W PD

Apple iPhone 15 Pro Max 256GB White Titanium

USB C Magnetic Adapter 24Pin, Type C Connector Support