FLUX 3 Image Klein
Black Forest Labs' 5.6B open-weights image model for text-to-image, editing, and up to 10 reference images, running on 8 GB GPUs.
Overview
Black Forest Labs released FLUX 3 Image Klein on October 15, 2026, a 5.6B-parameter open-weights model covering text-to-image generation, image editing, and multi-reference generation with up to 10 reference images. It supports native 4K output and bounding boxes for placing elements or restricting edits, and ships as a base model for fine-tuning, a step-distilled model for low latency, and FP8, INT8, and NVFP4 builds. BFL's internal evaluations rank it first among open-weights image models, with gains of 91 Elo in text-to-image and 70 in editing over the 9B FLUX.2 [klein] at 38% fewer parameters. The INT8 build runs on NVIDIA RTX GPUs with 8 GB of VRAM.
This is a sourced directory entry. Features and capabilities are reported in the linked sources; this entry does not document independent Aymorphic testing.
Key features
- 5.6B parameters; weights need about 11.2 GB in BF16 and 5.6 GB in FP8
- Text-to-image, image editing, and multi-reference generation with up to 10 reference images
- Native 4K generation and bounding-box control for placement and region-limited edits
- Base model for fine-tuning plus a step-distilled model for low-latency generation
- INT8 build runs on RTX GPUs with 8 GB VRAM; about 4 seconds for a 1MP image on an RTX 5090 in ComfyUI
- Median API latency of 4.54 s (text-to-image) and 7.18 s (editing) for a 1MP image (BFL-measured)
- Safety measures include dataset filtering, red teaming, and external evaluation by Cinder
Use cases
- Local image generation and editing on consumer RTX GPUs
- Fine-tuning a small open model on a brand or product style
- Reference-driven compositing from several source images
Pricing
Open weights under the FLUX Kommunity License: free commercial use for individuals and companies under $5M annual revenue; larger organizations need a self-hosted license or the API. BFL API (flux-3-image-klein) starts at $0.009 per 1K image.
Pricing reflects the source record and may change. Confirm current terms with the provider.
Dates and sources
- Released
- 15 Oct 2026
- Record updated
- 18 Oct 2026
- Record last checked
- 18 Oct 2026