There are numerous examples of highly advanced behaviours in Orcas, e.g. hunting strategies that require significant forward planning and close co-operation to pull off. E.g. washing seals off ice floes by swimming in tight formation to create a large bow wave. They also have complex social structures and behaviours, as with other dolphins and most whales generally. Mothers have been seen to teach calves hunting skills, e.g. pods that beach-hunt mothers have been seen "instructing" calves on how to do it, even pushing them toward the beach. This is clear evidence of culture - a very high-order behaviour. There is also strong evidence that Orcas have languages, differing significantly between different groupings.
In "Blackfish" it was reported that a pod of Orcas, that had had calves taken before, adopted a strategy to try foil the hunters. They split up with one group of adults swimming down one sound, breaching regularly to attract the attention of the hunters and divert them; while another group of mothers swam quietly with the calves down another sound (unfortunately, the hunters had a spotter aircraft). That story, if true, shows incredibly advanced planning, problem solving and organisational abilities.
You could go on and on. There is, to my understanding, *ample* evidence that these are *highly* intelligent animals, and are used to living very social and inter-dependent lives. On the latter social aspect, their needs potentially may even be much greater than ours.