No they wont. Any model you train now will be beat by GPT5 easily
While it's possible the gap between GPT5 and 4 is as big as between 4 and 3, it's unlikely. The gap between 2 and 3 was much larger as the one between 3 and 4 (and similarly between 1 and 2).
Also, it's not clear that GPT5 will do this in an *economical way* once the spigot of investor money stops.
And of course, not if you care about token throughput more than fancy abilities. Or price for that matter.
So for many if not most businesses needs GPT-4 isn't the best tool out there, and GPT-5 is the canonical example of a vaporware right now.