Show HN: GPT5 generated kayak weather forecaster

I wanted to share a project idea I've had bouncing around in my head for months now, but hadn't had the time to build out properly with other AI tools. Inspired by the demos from today's announcement, I decided to abandon any productive work and try out the new model. While it wasn't as easy as they showed on stage, it feels like a step-change improvement over any tools I've tried previously (Claude Code primarily, but models going back to GPT-3.5). The app itself has limited utility for HN I'm sure, but I thought I would share my real world example of how it has definitely leveled up my ability to build. This one feels different, FWIW.