FLUX.2 [klein] Base 4B
FLUX.2 Klein Base 4B is a 4B 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 4B official documentation
Practical use
Practical guidance. Choose the 4B base for a compact adaptation project with permissive weight licensing. Keep a held-out set of subjects and edits to measure whether a LoRA learns the desired change without overwriting unrelated features. Compare base and distilled outputs separately.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Access | Downloadable |
| Model identifiers | black-forest-labs/FLUX.2-klein-base-4B |
| Weight license | Apache 2.0FLUX.2 [klein] Base 4B official documentation |
| Sampling | Undistilled; the example uses 50 steps and guidance 4.FLUX.2 [klein] Base 4B official documentation |
Related models
- FLUX.2 [klein] 4B
Black Forest Labs · FLUX.2
Four-billion-parameter image generation and reference-editing model distilled to four sampling steps.
Launch date not confirmedAPI · Downloadable · Provider product