It's more complex than that. The famed octopus city[1] was populated by the gloomy octopus, a species which prior to the discover was believed to have been exclusively solitary.

[1] - https://www.smithsonianmag.com/smart-news/octopus-city-obser...

Well the LPSO is the only consistently social octopus. "Octopus city" was actually 2 cities (the second one being discovered in 2016) and they were groups of about 15 gloomy octopuses. There are a couple of other examples of octopus sociality but on a species-wide level only the LPSO can be comfortably described as social

Almost all octopuses are cannibalistic but Abdopus have also been found living close to and tolerating each other