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iOS and macOS 26.3 RCs Point to M5 Max and M5 Ultra, With No M5 Pro Reference

The naming pattern suggests higher‑end M5 chips, keeping focus on a near‑term MacBook Pro update.

Overview

  • Developers found T6051 (H17C) and T6052 (H17D) in the 26.3 release candidates, identifiers that align with Apple's convention for Max and Ultra tiers.
  • The expected M5 Pro identifier T6050 (H17S) is absent from the current code, introducing uncertainty about the initial chip lineup.
  • Reports interpret H17C as M5 Max and H17D as M5 Ultra based on Apple’s past use of C for Max and D for Ultra across M1 through M4 generations.
  • Outlets caution that code references are not formal announcements, with possibilities including a later addition of Pro support or a revised numbering scheme.
  • New MacBook Pro models are still anticipated to arrive with the macOS 26.3 cycle in the coming weeks, and a future M5 Ultra Mac Studio remains unconfirmed.