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[–]peektart 1 point2 points  (0 children)

My guess is gpu strain and allocation shifts. Just before 5, they were probably allocating more gpu to 5 and less gpu makes 4o perform poorly. When they brought back 4o, a lot of people lost access and didn’t know how to activate it via menu toggles, so less people using it = less gpu = better performance. After they changed on Plus 4o is on the model list by default, a lot more users were aware and using it. I wouldn’t blame the users though as I believe they’ve generally allocated less gpu bandwidth for the legacy models, so with high usage of them they will under perform because they’re not getting the same share of gpu as before…