FLUX 3 Klein: 4K images on an 8 GB GPU
Black Forest Labs released FLUX 3 Image Klein on the 15th of October 2026, an open image model that runs on home graphics cards. Through the API, 1,000 pictures cost about 9 dollars.
Black Forest Labs' FLUX 3 Image KleinBlack Forest Labs released FLUX 3 Image Klein on the 15th of October 2026, an open image model with 5.6 billion parameters. Its INT8 build runs on home graphics cards with 8 GB of memory, the company wrote.
Open means anyone can download the weights, the learned values that make up the model. Use is free for businesses with under 5 million dollars in yearly revenue, under the FLUX Kommunity License.
FLUX 3 Klein makes 4K pictures, edits, and works from 10 references
The model makes pictures from text, edits pictures and works from up to 10 reference images, the company's blog says. It draws native 4K pictures and places objects inside boxes the user marks.
It is the second open release of FLUX 3 after FLUX 3 Action, the company wrote. Weights are on Hugging Face, with ComfyUI support from day one.
Speed: 0.59 seconds on a DGX Station, 8.9 seconds on an RTX 4070
A 1024 by 1024 picture takes 0.59 seconds on Nvidia's DGX Station with the fast 16 step build, a chart on the blog shows. It takes 8.9 seconds on a GeForce RTX 4070 in the INT8 build.
Nvidia measured the times, the blog says. The full weights need 11.2 GB of memory, and the FP8 build needs 5.6 GB.
Below we break down the API price: 9 dollars for 1,000 pictures
The API starts at 0.009 dollars for a picture of about 1 megapixel, the blog says. So 1,000 pictures cost 9 dollars, by our arithmetic.
On an RTX 4070, 100 pictures take about 15 minutes, by our arithmetic.
What is confirmed and what is not
FLUX 3 Klein beats FLUX.2 klein 9B by 91 Elo points for text to picture and 70 for editing, Black Forest Labs wrote. Elo is a rating built from head to head comparisons.
These are the company's own tests, and the blog cites no outside test. It says FLUX 3 Klein ranks above Ideogram V4.5 and FLUX.2 pro.
Key facts
Released by Black Forest Labs on the 15th of October 2026.
5.6 billion parameters, open weights on Hugging Face.
Runs on 8 GB graphics cards in its INT8 build.
API from 0.009 dollars a picture, 9 dollars per 1,000.
Free for businesses under 5 million dollars a year.