This is just the VAE for FLUX.2. Per the blog post, the VAE for FLUX.2 is released under an Apache 2.0 license. (thank you BFL!).
FLUX.2 - VAE: A new variational autoencoder for latent representations that provide an optimized trade-off between learnability, quality and compression rate. This model provides the foundation for all FLUX.2 flow backbones, and an in-depth report describing its technical properties is available here. The FLUX.2 - VAE is available on HF under an Apache 2.0 license.
For the Flux.2 series of models, it appears the VAE is only included in the original format in the FLUX.2-Dev repo. I am adding it alone in this seperate repo so it can be accessed during training with AI Toolkit