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:
| Chip | SoC ID | Platform code |
|---|---|---|
| M1 | T8103 | H13G |
| M1 Pro | T6000 | H13J or H13S |
| M1 Max | T6001 | H13J or H13C |
| M1 Ultra | T6002 | H13J or H13D |
| M2 | T8112 | H14G |
| M2 Pro | T6020 | H14S |
| M2 Max | T6021 | H14C |
| M2 Ultra | T6022 | H14D |
| M3 | T8122 | H15G |
| M3 Pro | T6030 | H15S |
| M3 Max | T6031 or T6034 | H15C or H15M |
| M3 Ultra | T6032 | H15D |
| M4 | T8132 | H16G |
| M4 Pro | T6040 | H16S |
| M4 Max | T6041 | H16C |
| M5 | T8142 | H17G |
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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