Smbios Version 26 ((better)) Here

Some versions of 2.6 only report up to 255 logical processors. For modern servers with 64+ cores, you need SMBIOS 3.2+ for accurate topology. Use ACPI tables instead of SMBIOS for processor info when possible.

If your query relates to the latest operating systems, "version 26" often refers to macOS 26 Tahoe smbios version 26

SMBIOS major versions have been: