Halo Infinite developers promised a co-op mode when the game was about to come out. Expected timeframe for this release is August, and now we are looking at a test period for players in July. According to their timeframe, there seems no delay. For those who are a part of Halo Insider program, there is a chance to participate in this test. While there is no guarantee for being accepted, all you have to do is to fill a form so it is not a big deal.
343 Industries will release online co-op mode first, and we will hopefully see a follow-up with the splitscreen co-op mode. These are not the only expected releases though, as September marks the arrival of Forge mode. Season 2 of Halo Infinite started in May, so it is still a fresh competition out there for players to enjoy. There are surely some problems here and there, but game is slowly getting better as 343 Industries work on it. If you are not fond of PvP though, co-op mode is the best news for you for a good while.