Generate, edit, and combine references
Text-to-image, image editing, and multi-reference generation with up to 10 reference images.
New release · Image model
FLUX 3 Klein: open 4K model, 8 GB
FLUX 3 Image Klein is an open-weights image model that Black Forest Labs released on October 15, 2026. It has 5.6B parameters and handles text-to-image, image editing, and generation from up to 10 reference images. FLUX 3 Klein is not available on Nano Banana Pro yet; you can create images here today with Nano Banana Pro from 20 credits per image. Nano Banana Pro is an independent website and is not affiliated with Black Forest Labs.
5.6B parameters, open weights on Hugging Face
Native 4K, bounding boxes, up to 10 references
On this site: not available yet (checked October 15, 2026)
Specs
What FLUX 3 Image Klein can do
These numbers come from Black Forest Labs' launch announcement. Benchmark results in that announcement are the company's own evaluations.
Native 4K and bounding boxes
It shares native 4K generation and bounding-box control with the larger FLUX 3 Image model. A box sets where an element goes or keeps an edit inside one area.
Two checkpoints
A base model for fine-tuning and a step-distilled model for low-latency generation, with FP8, INT8, and NVFP4 builds.
Run it yourself
FLUX 3 Klein license, GPU, and API price
FLUX 3 Klein runs on your own GPU or through the Black Forest Labs API. Check the license before commercial use.
License: free under $5M revenue
The FLUX Kommunity License allows free commercial use for individuals and companies with annual revenue under $5M, plus research and non-commercial use. Larger companies need a self-hosted license or the API.
GPU: 8 GB of VRAM
The INT8 build runs on NVIDIA GeForce RTX GPUs with as little as 8 GB of VRAM through ComfyUI or Diffusers. Black Forest Labs reports about 4 seconds per 1MP image on an RTX 5090.
API: from $0.009 per image
The distilled model is in the Black Forest Labs API as flux-3-image-klein, priced from $0.009 per 1K image at launch.
Comparison
FLUX 3 Klein vs FLUX.2 [klein] vs Nano Banana Pro
FLUX figures come from Black Forest Labs. Nano Banana Pro figures are what our generator charges today.
FLUX 3 Image Klein
5.6B parameters, open weights, native 4K, up to 10 references. Black Forest Labs reports +91 Elo over FLUX.2 [klein] 9B in text-to-image.
FLUX.2 [klein]
The previous small FLUX model, offered as 4B and 9B variants. Black Forest Labs says FLUX 3 Klein beats the 9B with 38% fewer parameters.
Nano Banana Pro on this site
Available now, no GPU needed. 20 credits per text-to-image at 1K or 2K, 40 credits for an edit from a reference image.
FAQ
FLUX 3 Klein FAQ
What is FLUX 3 Image Klein?
An open-weights image model from Black Forest Labs, released on October 15, 2026. It has 5.6B parameters and handles text-to-image, image editing, and generation from up to 10 reference images.
Is FLUX 3 Klein free for commercial use?
Yes, for individuals and companies with annual revenue under $5M, under the FLUX Kommunity License. Larger companies need a self-hosted license or the Black Forest Labs API. Read the license before you ship.
What GPU do I need to run FLUX 3 Klein?
An NVIDIA GeForce RTX GPU with 8 GB of VRAM or more, using the INT8 build in ComfyUI or Diffusers, according to Black Forest Labs.
How much does the FLUX 3 Klein API cost?
From $0.009 per 1K image in the Black Forest Labs API at launch, using the model ID flux-3-image-klein.
Can I use FLUX 3 Klein on Nano Banana Pro?
No, not yet. FLUX 3 Klein is not in our generator. You can create images here today with Nano Banana Pro (20 credits per text-to-image at 1K or 2K), GPT Image 2.5, and Nano Banana 2.
Is Nano Banana Pro the official FLUX website?
No. Nano Banana Pro is an independent website. FLUX is a model family from Black Forest Labs, and we are not affiliated with Black Forest Labs. Upload only images you have the rights to use.