Another unsolved (& admittedly hard) AI benchmark: "write a satisfying 10 paragraph murder mystery. the pieces you need to solve the mystery should be clear enough in the first five paragraphs that you could solve it, but obscure enough that the vast majority of people will not" Errors are revealing: -Claude forgets to add the actual clue to the puzzle (and the details are too obscure), a classic planning problem for LLMs, and no, using Cowork or Code doesn't help. -ChatGPT 5.4 Pro creates a…