If you’re among the growing number of users hoping to see updated MacBook Pro versions with new M5 chips sooner rather than later, today’s macOS 26.3 RC brings some great news. Here are the details.
M5 Max and M5 Ultra referenced
As reported by MacRumors, today’s macOS 26.3 Release Candidate build includes references to what are very likely two new M5 chips for upcoming MacBook Pro updates.
More specifically, macOS 26.3 RC includes internal references to two new SoC IDs, T6051 and T6052, which are tagged with platform codes H17C and H17D.
To make sense of these codes, here are the SoC IDs and platform codes Apple has used so far for all other M-series Apple Silicon chips:
ChipSoC IDPlatform codeM1T8103H13GM1 ProT6000H13J or H13SM1 MaxT6001H13J or H13CM1 UltraT6002H13J or H13DM2T8112H14GM2 ProT6020H14SM2 MaxT6021H14CM2 UltraT6022H14DM3T8122H15GM3 ProT6030H15SM3 MaxT6031 or T6034H15C or H15MM3 UltraT6032H15DM4T8132H16GM4 ProT6040H16SM4 MaxT6041H16CM5T8142H17G
Based on this standard, it is likely that the T6051/H17C IDs refer to the upcoming M5 Max chip, while the T6052/H17D IDs refer to the M5 Ultra.
Interestingly, there seem to be no references to the M5 Pro chip (which should carry the T6050/H17S identifiers) yet, even though, at least in theory, the RC should be the exact same build that will roll out publicly when the release candidate becomes the final release.
What that means for the release timeline of the next MacBook Pros, we’ll likely find out sooner rather than later, as Bloomberg recently reported that the new models are “slated for the macOS 26.3 software cycle”.
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