of iOS 26.3 Release Candidate According to information discovered by , it contains references to a pair of unreleased chips in the M5 family. nicolas alvarez and shared mcroomers.

iOS 26.3 RC mentions two unreleased SoCs, T6051 and T6052, along with their associated H17C and H17D platform names. The standard M5 chip is numbered H17G, so 17 refers to M5. Typically, “C” lettering is used on Max tips and “D” lettering is used on Ultra tips. G is used for standard chips and S is used for Pro chips.

Using Apple’s historical numbers and letters as a reference suggests the following: M5 Max and M5 Ultra chips. There is currently no mention of T6050 H17S. This is the expected chip identifier and platform name for the M5 Pro.

We are currently waiting for a new version to be released. MacBook Pro For the M5 Pro and M5 Max chips, the chip reference is a little confusing. There are three possibilities. Either there’s an M5 Pro chip and an M5 Max and M5 Ultra chip that hasn’t been added to the iOS 26.3 code yet, Apple is changing the numbering, or Apple is planning M5 Max and M5 Ultra MacBook Pro models.

• Beta Chip 1:T6051, H17C. Probably up to M5.
• beta chip 2:T6052, H17D. Probably M5 Ultra.
• Not a beta version:T6050, H17S. Chip identifier required for M5 Pro.

All of Apple’s past Max chips used “C” lettering. M1 Max (H13C), M2 Max (H14C), M3 Max (H15C/H15M), M4 Max (H16C). There is also an M version of the M3 Max for the 14-core chip, and Apple used C for the 16-core chip.

All Ultra tips use “D” lettering. M1 Ultra (H13D), M2 Ultra (H14D), and M3 Ultra (H15D). There was no M4 Ultra chip.

It’s unclear why we’re only seeing signs of the M5 Max and M5 Ultra chips, but there are rumors that a new “MacBook Pro” model with the high-end M5 chip is set to launch in the coming weeks. Apple probably mac studio The M5 family will use the M5 Ultra chip, but we haven’t heard any rumors about its future release.