FLUX.2 [klein] 9B
FLUX.2 Klein 9B is a 9B rectified-flow image model for generation and reference editing. It is step-distilled for a four-step generation process.
Model details
The model handles text-to-image generation and multi-reference editing in one pipeline. The weights run through BFL's reference code, Diffusers or ComfyUI. Hosted API access has separate service terms from the downloadable weight license.FLUX.2 [klein] 9B official documentation
Practical use
Practical guidance. The 9B version adds capacity while retaining a short sampling recipe. Compare the complete local memory requirement with the 4B model, including its larger text encoder. Evaluate both prompt-only generation and reference editing, since one workload can improve more than the other.
KV-cache variant
FLUX.2 Klein 9B-KV is an optimized four-step variant that caches reference-image key and value tensors. It retains the 9B image generator and separate 8B Qwen3 text embedder.FLUX.2 [klein] 9B-KV official documentation
Caching avoids repeated processing of reference tokens during later denoising steps. The benefit is most relevant to image-editing workloads with reference images. The downloadable weights remain under the non-commercial license.FLUX.2 [klein] 9B-KV official documentation
Specifications & access
| Detail | Value and conditions |
|---|---|
| Access | API, Downloadable, Provider product |
| Model identifiers | black-forest-labs/FLUX.2-klein-9Bflux-2-klein-9bblack-forest-labs/FLUX.2-klein-9b-kvflux-2-klein-9b-preview |
| Weight license | FLUX Non-Commercial License; commercial deployment needs separate terms.FLUX.2 [klein] 9B official documentation |
| Sampling | Four inference steps.FLUX.2 [klein] 9B official documentation |
| Text embedder | Separate 8B Qwen3 model.FLUX.2 [klein] 9B official documentation |
Related models
- FLUX.2 [klein] Base 9B
Black Forest Labs ยท FLUX.2
Undistilled nine-billion-parameter image generation and editing checkpoint for adaptation and custom pipelines.
Launch date not confirmedDownloadable