They can, but they are known to have a self-favoring bias, and in this case, the error is so easily identified that it raises the question of why GPT-5 would both come up with it & preserve it when it can so easily identify it; while if that was part of OP's original inputs (whatever those were) it is much less surprising (because it is a common human error and mindlessly parroted in a lot of the 'scaling has hit a wall' human journalism).