The cloud container engine now supports C4 and M4 flavors for all current CCE versions.
C4 Flavors are currently in AZ1 and AZ3 from c4.large.2 (2 vCPU, 4 GB Mem) to c4.16xlarge.4 (64 vCPU, 256 GB Mem) available.
M4 Flavors are in all availability zones (AZ) from m4.large.8 (2 vCPU, 16 GB Mem) to m4.16xlarge.8 (64 vCPU, 512 Gb Mem) available.
See the release notes for C4 and M4 - https://open-telekom-cloud.com/en/support/release-notes/elastic-cloud-server/ecs-new-flavor-c4-and-m4-available
For details see https://docs.otc.t-systems.com/cce/index.html