Preview versions that contain new API capabilities. Note that a particular version isn't supported indefinitely. See Classroom API Roadmap for more information.

PREVIEW_VERSION_UNSPECIFIED No preview version set. The API behavior and capabilities are equivalent to the publicly released v1 version.
V1_20231110_PREVIEW The preview version for the Developer Preview Program release in November 2023.
V1_20240401_PREVIEW The preview version for the grading periods public preview release.