The AI Bench
Black Forest Labs · Differs by model

FLUX.2

Black Forest Labs image models. The 4B “klein” is small, fast and free for business; the 9B and the big “dev” are non-commercial.

How much memory it needs

Memory to run each model, from its model card or the size of its files. Smaller versions trade some quality for less memory.

ModelVersionNeedsBusiness use
FLUX.2 [klein] 4BFP88.3 GBAllowed
BF1613.0 GB
FLUX.2 [klein] 9B4-bit GGUF13.0 GBNot allowed
BF1629.0 GB
FLUX.2 [dev]4-bit20.0 GBNot allowed
BF1680.0 GB

Which computers run it

The best model in this group for each machine.

ComputerBest versionFit
Laptop or PC, no graphics card, 32 GBFLUX.2 [klein] 4B FP8Needs a graphics card
RTX 4060 · 8 GBFLUX.2 [klein] 4B FP8Spills into system RAM
RTX 3060 · 12 GBFLUX.2 [klein] 4B FP8Runs well
RTX 5060 Ti · 16 GBFLUX.2 [klein] 9B 4-bit GGUFRuns well
RTX 4090 · 24 GBFLUX.2 [dev] 4-bitRuns well
RTX 5090 · 32 GBFLUX.2 [dev] 4-bitRuns great
Mac with M4 · 16 GBFLUX.2 [klein] 4B FP8Runs well
Mac with M4 Pro · 48 GBFLUX.2 [dev] 4-bitRuns great
Mac with M5 Max · 128 GBFLUX.2 [dev] BF16Runs great
Ryzen AI Max+ 395 · 128 GBFLUX.2 [dev] BF16Runs well
DGX Spark · 128 GBFLUX.2 [dev] BF16Runs well
RTX PRO 6000 · 96 GBFLUX.2 [dev] BF16Runs well
Mac Studio with M5 Ultra · 256 GBFLUX.2 [dev] BF16Runs great
Mac Studio with M3 Ultra · 512 GBFLUX.2 [dev] BF16Runs great

What it is good and bad at

Good at

  • Text-to-image and image editing
  • klein 4B fits a 16 GB card

Not good at

  • klein 9B and dev: non-commercial licence
  • dev needs about 80 GB at full quality (about 20 GB at 4-bit)

Start it

  • FLUX.2 [klein] 4B: runs in ComfyUI (also diffusers, ComfyUI-GGUF, stable-diffusion.cpp (GGUF)). Model card
  • FLUX.2 [klein] 9B: runs in ComfyUI (also diffusers, ComfyUI-GGUF). Model card
  • FLUX.2 [dev]: runs in ComfyUI (also diffusers (bnb 4-bit)). Model card