UlazAI - AI Image & Video Tools
New in Image Studio · FLUX 3 Klein by Black Forest Labs
FLUX 3 Klein2 credits an image. Up to 4K.
FLUX 3 Klein is the small image model in Black Forest Labs' FLUX 3 family. It runs in the UlazAI Image Studio from 21 October, at 2 credits for a 1K image and 8 for 4K. We ran nine prompts through it before we wrote this page, twelve images in total. Every image here is one of those runs. Use this prompt opens the same settings in the Studio.
Measured on 21 October
- 2 credits
- for a 1K image
- 29-83 s
- per run in our test, queue included
- 10 images
- as references in one edit, no extra cost
- 1 to 4
- images per batch in the Studio
Pick a prompt, swap the subject
One run per prompt. Nothing here was picked from a pile of retries. Scroll sideways for more
Short text comes out right
The beach menu has five dishes with Dutch prices like 6,75. The Texel poster has one word in big letters. Both were spelled right the first time. We did not test long paragraphs, so zoom in before you print anything with small type.
New mug, same morning light
We gave Klein its own mug photo and asked for glazed terracotta and a croissant. The table, the window light and the camera angle stayed. The shape of the mug changed too, and we did not ask for that. If the shape matters, say so in your prompt.
Change the mug to glazed terracotta with a speckled finish and put a small butter croissant on a white plate next to it. Keep the table, light and camera angle the same.
Before
After
Two photos in, one scene out
Edit mode takes up to 10 reference images and they don't cost extra. We sent the fisherman and the living room and asked for him on the sofa with a newspaper. His face, the raincoat and the room came along. That's one 2K image, so 3 credits. Use this prompt →
Four drafts before you pay for one good render
Set the batch size to 4 and you get four takes of one prompt. On UlazAI a batch of four at 1K costs 5 credits. Our sticker run gave four versions in 29 seconds. And the honest part: we asked for an otter and got something closer to a bear cub. A cheap batch shows you that before you spend 20 credits on Nano Banana Pro.
How many credits does FLUX 3 Klein cost?
You pay per image. Extra images in a batch cost about half, and reference images in edit mode are free. Below is Klein next to the two other low-cost models in the Studio. At 1K it costs half of what they cost. At 4K the gap is small: 8 against 9 for Nano Banana 2.1.
Generate with FLUX 3 Klein| Model | 1K | 2K | 4K |
|---|---|---|---|
| FLUX 3 Klein | 2 | 3 | 8 |
| Seedream 5.0 Flash | 4 | 4 | n/a |
| Nano Banana 2.1 | 4 | 6 | 9 |
When Nano Banana 2.1 is the better pick
Klein is a small model. A face that has to stay the same through ten edits, or a hero image that goes through round after round of feedback, deserves a test with Nano Banana 2.1 first. Use Klein for drafts, series, posters, menus and quick product shots.
Open, prompt, pick a size
- Open the Image Studio and choose FLUX 3 Klein.
- Type a prompt, or add up to 10 photos and describe what has to change.
- Pick an aspect ratio, 1K, 2K or 4K and a batch of 1 to 4, then generate. The same credits also run AI videos, so a still can become the first frame of a clip.
Every prompt on this page
Copy them, change the subject, keep what works.
Chalkboard menu 3:4 · 2K
Chalkboard menu for a Dutch beach cafe called STRANDTENT DE ZEEMEEUW, hand-lettered in white chalk, five lines with prices: Kroket 4,50 / Tosti 5,00 / Erwtensoep 6,75 / Appeltaart 4,25 / Koffie 3,00, small seagull doodle, wooden frame, photographed on a terraceTravel poster 2:3 · 2K
Retro travel poster for the Dutch island Texel: lighthouse, dunes and sheep, flat screen-print style, the word TEXEL in bold sans-serif at the topPortrait 3:4 · 1K
Close-up portrait of an elderly fisherman with a weathered face and a yellow raincoat, harbour in the background, overcast light, 85mm photoInterior, 4K 16:9 · 4K
Scandinavian living room with a green velvet sofa, terracotta wall, large monstera plant, late afternoon sun, architectural interior photoProduct shot 4:3 · 1K
A matte black ceramic coffee mug on a pale oak table, morning window light from the left, soft shadow, a thin wisp of steam, product photo, shallow depth of fieldPhone wallpaper 9:21 9:21 · 1K
Vertical phone wallpaper: green aurora over a frozen fjord at night, a tiny red cabin with a lit window on the shore, stars, calm and coldSticker, 4 variations 1:1 · 1K · 4×
Flat vector sticker of a cheerful otter holding a vintage film camera, thick white outline, limited palette of teal, cream and orange, plain light grey backgroundEdit: terracotta mug 4:3 · 1K · with reference image
Change the mug to glazed terracotta with a speckled finish and put a small butter croissant on a white plate next to it. Keep the table, light and camera angle the same.Two photos, one scene 16:9 · 2K · with 2 reference images
The fisherman from image 1, in his yellow raincoat and cap, sits on the green velvet sofa in the living room from image 2, reading a folded newspaper. Keep his face and the room exactly as they are, same afternoon light.Questions about FLUX 3 Klein on UlazAI
How much does FLUX 3 Klein cost on UlazAI?
2 credits for a 1K image, 3 for 2K and 8 for 4K. A batch of four at 1K costs 5, because extra images in a batch cost about half. Reference images in an edit are free.
Does FLUX 3 Klein make video?
No. FLUX 3 is a whole family from Black Forest Labs, and the video models in it are separate. Klein makes still images. For clips, use the UlazAI Video Studio.
Which aspect ratios does FLUX 3 Klein support?
1:1, 4:3, 3:4, 3:2, 2:3, 16:9, 9:16, 21:9 and 9:21. In edit mode there is also auto, which keeps the shape of your first image.
How many photos can I use in one edit?
Up to 10. Refer to them in your prompt by order, like 'the man from image 1'. More than 10 is refused before you pay.