An annoyingly common question I get as an AI PhD student is “When can you get the ChatGPT AI to do something useful? It can’t even work on my phone yet. Siri is pretty dumb.” To be fair, I think their criticism is correct. I personally wished that AI was better integrated on my phone. LLMs can solve IMO problems, so shouldn’t it be a cakewalk for it to remind me of the text I forgot to respond to last week? Obviously not, since it doesn’t exist in my pocket yet. Or maybe Apple’s new update yesterday fixed this and my research project is obsolete. We are releasing iOSWorld ( a dynamic iPhone benchmark with 26 newly created apps grounded in personal context. Each of the 26 apps is centrally seeded around one persona, Jordan Avery, and the apps interact together in a realistic ecosystem that reflect real app interactions. We create 133 personalized mobile agent tasks to test in this environment, and the best model, even with privileged information, only scores 51%.