LibreFLUX is an open-source version based on the Apache 2.0 license, offering full T5 context length with the implementation of attention masks. It restores classifier-free guidance and removes most of the FLUX aesthetic fine-tuning/DPO, meaning it may be less visually appealing than the base FLUX but has the potential to be more easily fine-tuned to any new distribution. The development of LibreFLUX adheres to the core principles of open-source software, which typically involves greater complexity, slower, clunkier performance, and aesthetics reminiscent of the early 2000s.