from together import Together
client = Together()

volume = client.beta.clusters.storage.update(
  volume_id="12345-67890-12345-67890",
  size_tib=3
)
print(volume)

{
  "volume_id": "<string>",
  "volume_name": "<string>",
  "size_tib": 123,
  "status": "available"
}