x-Prediction Is All You Need:Training-Free Accelerated Generation via Endpoint Decodability
arXiv:2607.06114v1 Announce Type: new Abstract: Diffusion and flow matching models generate high-quality samples, but their ODE samplers often need tens to hundreds of neural function evaluations (NFEs). This remains a practical challenge for released checkpoints, since many accelerators require additional design choices and training cost through retraining, distillation, or trajectory redesign. We investigate a different route based on $x$-prediction. During sampling, standard affine probabilit