Halo 5 had the highest monthly active players in Halo since Halo 3, says 343 Industries.

Warzone Firefight update came out a week ago, and along with it the team at Microsoft made Halo 5 free for a whole week for players to experience arguably the best Halo since Halo 2. The head of community team at 343 Andy “Bravo” Dudynsky went to /r/Halo to express the company’s feelings, and here’s what they said:
“I do believe you’d be very pleasantly surprised with not only the number of players who jumped on during the free play period (holy moly lots! by golly it worked!), but also the amount of Halo 5 players each day and month – this isn’t something we’ve talked about yet, but I am rather happy to share that even before the free play period, Halo 5 has had the highest monthly active players for a Halo title since Halo 3.
“Also exciting (and not yet discussed, either) is the increase that H5 has seen in players each month over the past few months (we just got done looking at June numbers, which are once again higher than the previous month). As you can imagine this is pretty darn exciting to see, and this thread seemed like an appropriate place to share this news for the first time.”
This is some great news for Halo fans. Read our Halo 5 review here and as well our Warzone Impressions