If we think that machines that recombine and interpolate our prior out are intelligent then yes we have probably peaked as a species. Anyway evolution is not telological. It may surprise HN posters but people were as intelligent if not more so as present thousands of years ago. When a problem is solved is more a question of attention, reward, available knowledge base, etc. intelligence is an adaptation to solve the problems of biological life. It would be hard to argue that solving this cypher would have increased anyone's reproductive fitness that much hence it was unsolved. Unsolved problems are often so less because of intrinsic difficulty but lack of conditions that impell their resolution. It is not at all surprising that llms with the full human knowledge base at their disposal, ample computational resources, and the programmed reward of finding the best completion are solving unsolved problems nobody needed to solve anyway. This however is not intelligence in the human sense. Humans solve problems for biological advantage in a dynamic landscape. Llms solve problems to optimize a completion function in a fixed pre trained one.