Anthony Edwards has had a couple of jumps that make you stop the video and run it back. I put his best vertical at about 43 inches, but I would not use every famous Ant clip to get there. On two of the wildest ones, he makes contact with somebody on the way up.
The block where he hit his head
Ant said the game-saving block was the highest he had ever jumped. I believe it felt that way. He was still going up when his head met the rim. But watch his teammate as the play develops: there is contact that may have boosted him. I cannot tell you exactly how much it helped, so I would not use that one frame as a clean measurement of what he can do by himself.
There is a similar problem with the dunk over Yuta Watanabe. It is an insane play, and contact does not make it less impressive. It does make the height harder to calculate from the clip. If someone pushes into you while you are rising, the result is not the same as a solo maximum jump.
Look at the fast-break windmills
Those give Ant room for a full approach without someone underneath him. His head looks a little below the rim in the ones I used. He is also carrying a ball and finishing a windmill, which can cost a bit of height compared with jumping just to touch something. Put those pieces together, and around 43 inches makes sense to me.
The TikTok mentions a reported 41.5-inch jump from his Georgia days. I have not found the original test method, so I would not use that as a verified benchmark. My 43-inch number comes from later footage, not from adding a proven amount to that old claim. See the NBA vertical table for the rest of the series and the game-jump article for what other elite jumpers say about their best attempts.