Black Forest LabsImage modelFast enough to think with.
Cheap enough that a bad prompt costs nothing worth noticing.
Composition tests
Find the framing before you pay for the final.
Prompt tuning
See how wording changes the result, fast.
Bulk imagery
Large sets where speed and cost matter more than the last detail.
- Provider
- Black Forest Labs
- Family
- FLUX 2
- Size
- 9 billion parameters
- Reference images
- Up to 4
- Prices
- 1 credit at HD, 2 at Full HD or 4K
- API and MCP
- Yes
- Plans
- Every plan
- Cost
- 1 to 2 credits per image
Nano BananaWhat is Flux 2 Klein 9B?
Flux 2 Klein 9B is the small, fast model in Black Forest Labs' FLUX 2 family, at 9 billion parameters. It returns images in moments with up to four reference images, and on APImage it costs 1 credit at HD and 2 at Full HD or 4K. It is included on every plan, including the free tier. Use it to iterate on composition and prompt cheaply, then finish on Flux 2 Pro, Flux 2 Max or FLUX 3 Image.
How much does Flux 2 Klein 9B cost?
1 credit at HD and 2 at Full HD or 4K, plus 1 credit per megapixel of reference images.
Is it on the free plan?
Yes. Klein 9B is included on every plan, including the free tier's three watermarked images.
Is it in the API?
Yes, in the REST API and the MCP server.
How do I use it?
Open the image studio and pick Flux 2 Klein 9B. Write the prompt and add references if you have them. Generate, adjust, generate again. Move the winner to Flux 2 Pro, Max or FLUX 3 Image for the final.