According to Jujutsu Kaisen chapter 236, Gojo has been defeated by Sukuna. His body was torn in half.
but in 235 he was 'winning' what happened between that?
Sukuna explaining that the more Mahoraga is attacked, the faster it adapts to said attack. When Mahoraga was adapting to Infinity, it started to tailor the Cursed Energy so that it nullified Infinity.