Black Forest Labs released the FLUX 3 Image Klein Prompt Upsampler on Hugging Face. It is a 9 billion‑parameter vision‑language model that turns a brief description, up to ten reference images, and optional bounding boxes into a full prompt for the FLUX 3 Image Klein generator. The model is a fine‑tuned version of Qwen3.5‑9B with the vision tower frozen. It runs by default in front of the image model, but can be disabled with a flag.
Why it matters
Artists and developers can generate richer image prompts automatically, saving time when creating detailed text‑to‑image inputs.
