FLUX.2 [klein] 4B AI
FLUX.2 [klein] 4B is Black Forest Labs' small, open (Apache-2.0) FLUX.2 model: sub-second text-to-image and editing with up to 4 reference images, at a fraction of a cent per image. Released January 2026. Try it online in the Studio or call it from code, up to 93% below the official price.
- Developer
- Black Forest Labs
- FLUX family
- Released
- January 2026
- Sizes
- up to 2K
- 2 sizes
- From
- $0.001/image
- 1K
Try it
Try FLUX.2 [klein] 4B AI now
Runs on your balance at the price on the button; failed runs are refunded. Results are saved to your account.
What it is
What is FLUX.2 [klein] 4B?
Real-time FLUX
klein 4B distills FLUX.2 into 4 steps, so images come back in well under a second — for live previews, batch jobs and interactive apps.
Edits too
Give it up to 4 reference images and describe the change; the output follows the input image.
Capabilities
What FLUX.2 [klein] 4B can do
Sub-second
4-step distilled
Fraction of a cent
Per 1 MP image
4 references
Image editing
Open weights
Apache-2.0
Examples
FLUX.2 [klein] 4B examples
Prompts you can load into the Studio and try.
Flat-lay of breakfast on a marble table, top-down, bright daylight
- Image Edit
Make the jacket in image 1 bright yellow, keep everything else
Use cases
What people use FLUX.2 [klein] 4B for
- Images from a description
- Illustrations, product visuals and concepts, up to 2K.
- Editing your images
- Change backgrounds, colours or outfits, or combine up to 4 images in one edit.
- Any format
- 7 aspect ratios, from banners to vertical posts.
Versions
FLUX.2 [klein] 4B in the FLUX family
Every FLUX model we offer, newest first. FLUX AI covers the whole family.
| Model | Released | Max size | From |
|---|---|---|---|
| FLUX 3 Image Klein | October 2026 | 4K | $0.0011/image |
| FLUX 3 | October 2026 | 4K | $0.0317/image |
| FLUX 3 Video | August 2026 | 720p · 5–20 s | $0.1564/s |
| FLUX.2 [klein] 4B | January 2026 | 2K | $0.001/image |
| FLUX.2 [max] | December 2025 | 4 MP | $0.0644/image |
| FLUX.2 [pro] | November 2025 | 4 MP | $0.0276/image |
| FLUX.2 [flex] | November 2025 | 4 MP | $0.046/image |
| FLUX.1 Kontext [pro] | May 2025 | 1K | $0.0348/image |
| FLUX.1 Kontext [max] | May 2025 | 1K | $0.0695/image |
How it compares
FLUX.2 [klein] 4B vs similar models
FLUX.2 [klein] 4B vs FLUX.2 [pro]
FLUX.2 [klein] 4B
- Lower price: $0.001/image vs $0.0276/image at 1K (97% less).
- Higher maximum resolution: 2K vs 4 MP.
- Newer model (released January 15, 2026).
FLUX.2 [pro]
- Edits with up to 8 input images (vs 4).
- More aspect ratios: 10 vs 7.
Where to use it
Three ways to use FLUX.2 [klein] 4B
In the Studio
No code: write a prompt, pick the settings, generate. The price is shown before you run.
Through the API
One key and one request shape for every model; poll the generation or get a webhook.
FAQ
FLUX.2 [klein] 4B AI questions
FLUX.2 [klein] 4B is Black Forest Labs' open-weights model. CheaperGen provides API access to the open weights, run on GPU inference for open-source models, and does not own the model. Trademarks belong to their respective owners.