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I think you have to specify as tier something like `custom-&lt;NUMBER_OF_CPUS&gt;-&lt;AMOUNT_OF_MEMORY&gt;` e.g. `custom-4-4000` which ends up as 4 cpu and 4000 MB memory. I got that from here: <https://cloud.google.com/compute/docs/instances/creating-instance-with-custom-machine-type#creating_the_instance> and here: <https://www.terraform.io/docs/providers/google/r/compute_instance.html#machine_type>