Nuxt 4 is not yet released but will have full support from Netlify on Day 1. Users can opt their Nuxt 3 sites into "Nuxt 4" by setting future.compatibilityVersion: 4 in the Nuxt config file. Notable changes include a new default directory structure and minor fetching and caching behavior changes. Netlify has rewritten its support for Nuxt apps, unlocking improvements such as automatic support for server streaming, Blobs, on-demand cache invalidation, hybrid rendering, ISR with standard HTTP headers, fine-grained ISR configuration per route, and fewer function invocations. The Nuxt team has partnered with Codemod to make migrating existing sites seamless.