Black Forest Labs listed FLUX 3 Image Klein in its release notes on October 15, 2026.
What to know
- Size and licence type: BFL describes it as an open-weight, 5.6B-parameter version of FLUX 3 Image. The release notes do not state the licence, so check the model card before commercial use.
- Features: text-to-image, editing, multi-reference and bounding boxes.
- Two variants: a distilled variant for fast inference and a base variant for fine-tuning.
- Output: up to 4K.
Why it matters
Open weights let you run and fine-tune a model on your own hardware. Klein is the smaller sibling of FLUX 3 Image, which BFL released on October 1. For prompt tips, see how to write better image prompts, and for other options see best open-weight AI models and the model tracker.
Source: Black Forest Labs release notes. We summarise in our own words; check the source for the full details.