Whether or not the Omega 4564 is thermocompensated has not been confirmed. There are mixed opinions about this, and even instances of inconsistent information provided by Omega.

The caliber confusion occurs because the cal. 4564 is essentially an Omega branded ETA caliber E64.111. The E64.111 is produced as a PreciDrive or non-PreciDrive movement. PreciDrive movements are thermocompensated, but there is no way to tell if the 4564 is PreciDrive or not.