Lovable now builds with Fable 5.1. It’s especially good at fixing and improving existing apps without breaking what already works. On the most difficult tasks, it outperforms Fable 5 by 17%, at a 31% lower cost. It’s also better at checking its own work and has sharper visual taste, with a 3.5% lift in visual design quality. For Lovable builders, this means more reliable updates, improved design quality, and less time spent fixing unintended issues.