CAT-Flow: Curvature-Adaptive sTeps for Flow Matching
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Computer Science > Machine Learning
arXiv:2609.01746 (cs)
[Submitted on 1 Sep 2026]
Title:CAT-Flow: Curvature-Adaptive sTeps for Flow Matching
Authors:Qinchan Li, Pedro Cisneros-Velarde, Keru Fu, Samuel Antunes Miranda, Sharan Vaswani, Hao Zhang
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Abstract:Flow Matching has emerged as a leading framework for generative modeling, powering state-of-the-art systems such as FLUX and Stable Diffusion 3.5. However, the iterative nature of its ODE-based sampling process creates a fundamental efficiency bottleneck: the quality of generated samples is highly sensitive to the choice of step-sizes, and current models typically require 20 to 30 steps for good quality. In this work, we propose two lightweight, training-free algorithms, CAT-OV and CAT-OT that adapt step-sizes at inference time based on a novel connection between Flow Matching sampling and gradient flow. Our algorithms are computed efficiently by not requiring additional neural function evaluations. Specifically, CAT-OT estimates curvature over time via a finite-difference approximation of the time-derivative of the vector field, while CAT-OV approximates curvature over the state space via a gradient of the vector field. Under suitable conditions, both methods have truncation error bounds of constant order. Empirically, CAT-OV and CAT-OT outperform existing step-size heuristics in image quality metrics across four text- to-image Flow Matching models, reducing the number of generation steps required to reach comparable quality by up to 40%.
| Subjects: | Machine Learning (cs.LG) |
| Cite as: | arXiv:2609.01746 [cs.LG] |
| (or arXiv:2609.01746v1 [cs.LG] for this version) | |
| https://doi.org/10.48550/arXiv.2609.01746
arXiv-issued DOI via DataCite
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View a PDF of the paper titled CAT-Flow: Curvature-Adaptive sTeps for Flow Matching, by Qinchan Li and 5 other authors
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