What will it take for an OOS student to get into UT Austin?

My son is a Junior in a charter school in MA. His top choice is UT Austin for Computer Science. I understand that the acceptance rate for OOS is very low there.
His WGPA is currently 4.0 and his school doesn’t rank.
He just took the ACT. What score will give him a reasonable chance (not necessarily guaranteed) to be accepted as an OOS?
He played JV Basketball (Captain) and is on the Varsity team now.
We expect him to get good recommendations.
What else do they consider as key differentiators, especially for OOS?

Thanks

Hi, I’m also a junior applying to UT Austin from OOS next year…most of it depends on your major, and computer science is probably the hardest to get into unfortunately. If I were him I would try to get a 34 and do more ECs…if all he does it basketball that’s not really going to help

I was admitted to UT Austin as an OOS admit this year. I had a 4.1 weighted (3.75ish UW) a 2200+ SAT, and a 33 ACT. No one from my school had ever been rejected with those stats. I was also a direct admit to my major. Will not go into too much detail on thread, PM me if you need more info.