What LLMs or AI agents do you use, and why?

"My Microsoft PM intern process was way less standardized than I expected. I didn't even have a recruiter screen. I got moved straight into a superday with three back-to-back interviews, each around 45 to 60 minutes, with breaks in between. The first round was led by a software engineer who basically audited how technical I was and how I work with engineers, the second made me open my calendar and turn my real student life into PM thinking, and the last mixed responsible-AI judgment with broader Microsoft product critique. The whole thing felt much more like they were testing my niche and how I think in context than running a clean product design, product strategy, and behavioral split. I got the offer, and what was funny is that I interviewed through a privacy/compliance-heavy group, but later ended up interning in education."