PRODUCT-MARKET FIT HAS ALWAYS BEEN A TREADMILL, BUT IT JUST GOT WAY FASTER

Summary from the TLDR Founders newsletter

Product-market fit has always been a treadmill, but the AI innovation cycle is making it go at a much faster pace. Founders now need to be concerned about whether they're compounding fast enough to keep their product-market fit. Teams that compound customer usage into model performance run faster. The teams pulling ahead are building for the intelligence they expect to have in six to nine months.