Black Forest Labs’ FLUX.2 family is now fully out in the open, but “open” covers three meaningfully different models with three different licenses — worth sorting out before picking one to build on.
Watch: Black Forest Labs: FLUX 2 – The King of AI Image Generation (YouTube)
The three tiers
FLUX.2 [dev] is the flagship: a 32-billion-parameter rectified flow transformer capable of generating, editing, and combining images from text instructions, with weights published on Hugging Face for local use. FLUX.2 [klein], which launched January 15, 2026, is a size-distilled version of that base model, released in two sizes — 4B and 9B parameters. The two klein sizes carry different licenses: the 4B model is Apache 2.0, meaning genuinely unrestricted commercial use, while the 9B model runs under the FLUX.2-dev Non-Commercial License instead. Same model family, same release day, different rules depending on which size you pick.
What the small one actually gets you
The 4B klein model is the one worth paying attention to if you’re working on consumer hardware: Black Forest Labs’ own figures put it at generating or editing an image in under half a second on modern hardware, and it’s designed to fit inside roughly 13GB of VRAM — comfortably within reach of cards like an RTX 3090 or 4070, not just top-tier workstation GPUs. NVIDIA worked directly with Black Forest Labs and ComfyUI to ship FP8-quantized versions at launch, cutting VRAM requirements by about 40% and improving performance by a similar margin on RTX hardware.
Why “editing and combining,” not just “generating,” is the detail to notice
FLUX.2 [dev]‘s stated capability set includes editing and combining images from text instructions, not just generating new ones from scratch. That’s a meaningfully different tool than a pure text-to-image model — it points toward compositing and iterative editing workflows rather than one-shot generation, which matters more for anyone doing production creative work than a benchmark score does.
What to actually pick
If you want unrestricted commercial use on modest hardware, the 4B klein model is the only one of the three that guarantees that combination — the 9B klein and the 32B dev model both carry non-commercial terms. Both klein sizes are available directly in ComfyUI and through Diffusers, so testing the difference between them doesn’t require switching tooling, just swapping which checkpoint you load.