Portable LLM on a USB Stick: I Built Offline AI That Runs Anywhere [2026 Guide]

Last month I was sitting in a client's office — no Wi-Fi, a locked-down corporate laptop, and a deadline to rewrite 40 API endpoint descriptions. Every cloud-based AI tool I normally rely on was completely unreachable. So I pulled a Samsung T7 SSD from my bag, plugged it into the USB-C port, and had a portable LLM on a USB stick generating clean documentation in under two minutes. No internet. No API keys. No data leaving the room. This wasn't a party trick. It's genuinely the most useful thing