Thanksgiving last year, after GPT-4 was released, I realized large language models were finally good enough to bring my idea to life: an AI book generator. Over the holiday weekend, I built the prototype for https://instabooks.ai , to allow anyone to instantly generate 200+ page books on any topic. I sell them in pdf, epub and print form and they take about 30 minutes to complete. Since launch, over 10,000 books have been generated on topics ranging from niche hobbies to advanced research. The system runs almost entirely on its own, requiring only occasional updates and customer support. The best part of it: as new LLM models come out, the books get better written as well, so each year it improves without much effort on my end.