It seriously struggles with “how many letters are in <word>” and I kinda get why (it just converts words to numbers), although it should work when you type the letters with a space in between (so each letter is a number, and repeated letters are repeated numbers). But I was surprised when it started screwing up easy math again
I honestly think “GPT-5” was just a way for them to shift people onto lower cost models for most stuff while still rolling out a bit of an upgrade to their best model. But it definitely feels rushed. Seems like they’re really starting to feel the pressure from competitors and I’m sure they’re far from making money