There's a grappling hook rumor circulating about Halo Infinite, thanks to a leaked screenshot and a recruitment video with footage that matches the initial leak. 343 Industries has addressed this, saying the footage in question "doesn’t show anything meaningful and isn’t even necessarily content from Infinite." But Master Chief would very well use a grappling hook across Infinite's open world on Xbox Series X.
343 Industries Downplays Halo Infinite Grappling Hook Rumor - GS News Update
Will Master Chief have a grappling hook in Infinite? 343 isn't saying yet.