Unlike it’s big brother Far Cry 4, Far Cry: Primal will not include any co-op missions. A potential customer on the Steam forums noted the game was listed as single player only and asked if this was the case, and the developer responded:
Correct. We are focusing entirely on creating the best possible Far Cry experience for our fans. Bringing the Stone Age to life and providing players with a strong gameplay experienced based off of the Far Cry legacy meant that we had to reinvent our core gameplay loop.
This was definitely not a small undertaking. Our focus was on delivering this fantasy which required clear priorities for the team. Therefore, in the early stages of the project, we made the difficult choice of focusing our efforts on the single player experience.
This does conflict with the recent rating of the game in Australia which listed “online activity” alongside plenty of sex, drugs and nudity. Wahey!