The AI demos showcased at GitHub HQ included a dating app designed in under two minutes by Uizard's CEO, Tony Beltramelli, as well as various apps built with Anthropic's language model, including an art curator and fashion search engine. Superhuman's pre-launch feature Instant Reply was also demonstrated, which aims to make email management more efficient by providing passive AI features. The event was hosted by Jam at GitHub HQ, featuring demos from these companies and a focus on developer-friendly tools such as bug reports and AI debugging assistants.