Black Forest Labs
FLUX.3 Image Klein
FLUX.3 Image Klein is the small, open-weights member of Black Forest Labs' FLUX.3 family, run at 1K through OpenRouter. At 15 credits an image it ties with GPT Image 1 Mini as the cheapest model here that takes references, and its references are free: up to ten photos, for edits that keep a character or product the same across shots.
FLUX.3 Image Klein is made by Black Forest Labs. Prompt Generator is independent and not affiliated with Black Forest Labs; we run the model through OpenRouter.
15 credits
- Model
- FLUX.3 Image Klein · Black Forest Labs
- Cost
- 15 credits
Your results appear here when you press Generate.
Specs
- Vendor
- Black Forest Labs
- Type
- Text to image
- Price
- 15 credits per image
- Aspect ratios
- 1:1, 4:3, 3:4, 16:9, 9:16
- Reference images
- up to 10
- Served via
- OpenRouter
Best for
- Cheap edits from several reference photos
- Keeping a character the same across many images
- Testing a FLUX.3 prompt
Tips
- Iterate here, then move to FLUX.3 Image (75 credits) for the final.
- Name each reference by its role, for example 'the logo from photo 3'.
Questions
1How many credits does FLUX.3 Image Klein use?
15 credits per image, one image per run. Reference photos cost nothing extra. If a run fails, the credits go back to your balance; runs stopped by the model's safety filter are refunded up to 10 times a day.
2What can I give FLUX.3 Image Klein besides a prompt?
Up to 10 reference photos (PNG, JPEG or WebP, up to 12 MB each). Leave them out and pick Create image to work from the prompt alone, or add them and pick Edit photo. Output sizes: 1:1, 4:3, 3:4, 16:9 or 9:16.
3Can I use what I make with FLUX.3 Image Klein in paid work?
Yes, when you made it on a paid plan or after buying credits. Results made only with the free sign-up credits are for personal, non-commercial use. Anything you upload must be yours to use, and people shown in it must have agreed.
Compare with all models.