FLUX.2 [klein] Base 9B
FLUX.2 Klein Base 9B is a 9B rectified-flow image model for generation and reference editing. It is the undistilled foundation checkpoint for fine-tuning and custom pipelines.
Model details
The base has neither step nor guidance distillation. It exposes the full model for LoRA training, research and custom sampling. BFL distributes it as weights; the public Klein API uses the distilled model.FLUX.2 [klein] Base 9B official documentation
Practical use
Practical guidance. Use the 9B base when custom training needs the undistilled model. Plan for its text encoder as well as the generator during training and inference. Evaluate diversity and subject consistency on images outside the adaptation set before reducing sampling steps.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Access | Downloadable |
| Model identifiers | black-forest-labs/FLUX.2-klein-base-9B |
| Weight license | FLUX Non-Commercial License; commercial deployment needs separate terms.FLUX.2 [klein] Base 9B official documentation |
| Sampling | Undistilled; the example uses 50 steps and guidance 4.FLUX.2 [klein] Base 9B official documentation |
| Text embedder | Separate 8B Qwen3 model.FLUX.2 [klein] Base 9B official documentation |
Related models
- FLUX.2 [klein] 9B
Black Forest Labs · FLUX.2
Nine-billion-parameter rectified-flow image model with four-step generation and reference editing.
Launch date not confirmedAPI · Downloadable · Provider product