Scientifically useful physics simulations. Every model absolutely sucks at them.
Or, as someone else points out in another thread here, academic writing. It's one of the things newer models seem to have actually gotten worse at. Even when you give them detailed instructions on how to write and what to avoid, the "load-bearing", "A but not B" and journal-like writing make it in anyway, with the supposed AGI having no ability to reflect on how blatantly unacademic (and often unreadable) its writing is.
Or, as someone else points out in another thread here, academic writing. It's one of the things newer models seem to have actually gotten worse at. Even when you give them detailed instructions on how to write and what to avoid, the "load-bearing", "A but not B" and journal-like writing make it in anyway, with the supposed AGI having no ability to reflect on how blatantly unacademic (and often unreadable) its writing is.