Flux 2 Klein 9B Uncensored
Flux 2 Klein 9B Uncensored is Black Forest Labs's image model, hosted on Vellria with nothing to install: text to image and image to image, output up to 1024×1024. Run it in Studio or over the REST API, 5 credits (100 credits = $1.00).
vellria-flux-2-klein-9bFlux 2 Klein 9B is developed by Black Forest Labs. Vellria provides access to the model; it does not own it. All trademarks belong to their respective owners.
Output
No generation yetCover art
5 credits
Your request will cost 5 credits.
About FLUX.2 Klein 9B
Also known as: FLUX.2 [klein] 9B · Flux 2 Klein · Black Forest Labs FLUX.2 klein
FLUX.2 Klein 9B is the compact member of Black Forest Labs' FLUX.2 family, a nine-billion-parameter model that handles fresh images and instruction edits in one place. Black Forest Labs describes it as tuned for realism and crisper text generation, so skin, fabric and the lettering on signs come out clean for a model of its size. Vellria runs both halves hosted and uncensored, with nothing to install.
Starting from text gives seven shapes at roughly one megapixel: square, two landscape and two portrait proportions, and the wide and tall screen formats. Every run costs the same flat price whichever shape you choose, and a seed lets you rerun a frame you like with one change at a time.
Editing takes one to three pictures at the same flat price. Leave the size unset and the result follows the proportions of the first picture; choose one of the seven sizes when the edit has to fit a specific frame. Write the change as an instruction, for example a new outfit, a different room or new light, and name what should stay.
There is no negative prompt, no guidance or step setting and no prompt-expansion step, so the prompt is the whole control: describe what belongs in the frame. For the quickest and cheapest drafts, Pruna P-Image is faster; for edits that combine up to ten pictures named in the prompt, use Qwen Image 2.1; and for finished images above one megapixel, Seedream 5.0 Pro goes larger.
FLUX.2 Klein 9B in action
FLUX.2 Klein 9B outputs with the exact prompts behind them.
Text to image
Detailed close-up portrait of a Scottish woman in her early forties with silver-streaked red hair, freckles and grey-green eyes, wearing a cable-knit fisherman sweater, overcast coastal light, fine skin texture and individual hair strands, 100mm lens, photorealistic
Text to image
Glamour portrait of a Brazilian woman in her thirties in a sheer champagne silk robe over a matching slip, standing in a sunlit bathroom with green tiles and potted ferns, damp hair, soft backlight, confident and suggestive, fine detailed photography
Text to image
Highly detailed fantasy portrait of a dwarven blacksmith man in his forties with a braided red beard and soot on his forearms, leather apron, holding a glowing horseshoe in tongs at a roaring forge, sparks in the air, photoreal concept art
Text to image
Cinematic wide shot of a man in his thirties in a wool overcoat standing on a frozen lake at dawn, pale pink sky, mist rising from cracks in the ice, distant pine forest, extremely fine detail, quiet and vast, 65mm film look
Text to image
Macro photograph of morning dew drops on a spider web strung between wild grass stems, each droplet reflecting the sunrise, soft creamy bokeh, ultra-fine detail
Text to image
Detailed architectural photograph of an ornate Art Deco hotel lobby with geometric brass inlays, green marble columns and a sweeping staircase, warm evening light, no people, no text, no signs
Text to image
A woman in her thirties lying on her stomach on rumpled white sheets, reading a paperback, her bare back and shoulders in soft afternoon light through linen curtains, the sheet draped at her waist, intimate and tasteful, fine detailed photography
- Before
AfterEdit
Restyle the photo as a moody black-and-white portrait with deep shadows and fine film grain; keep her face, the sweater and the framing
When to pick FLUX.2 Klein 9B
Pick it when
- Legible lettering matters: a sign, a label, a tattoo or a caption has to read correctly in the picture.
- You want realistic skin and fabric at one flat price, in fresh images and in edits with up to three references.
- About one megapixel in a square, landscape, portrait or screen shape is enough for where the picture will be used.
Pick another model when
- You want the cheapest, fastest drafts to explore many ideas; Pruna P-Image costs less per run.
- An edit has to combine more than three references; Qwen Image 2.1 takes up to ten and lets you name each one.
- The final image must be larger than about one megapixel; Seedream 5.0 Pro renders finished high-resolution images.
Prompt or reference
Start from text to compose something new and choose its frame. Attach a few pictures when the subject already exists and an instruction should be applied to it: leave the size unset to keep the first picture's proportions, or pick one for a fixed frame. The price is the same either way.
How to use FLUX.2 Klein 9B on Vellria
- Prompt: up to 10,000 characters in the panel above.
- To edit or combine pictures, attach 1–3 reference images; leave them out to start from text.
- Cost: 5 credits — see pricing.
Example prompts
A neon sign reading 'OPEN ALL NIGHT' above a bar door, an adult woman in a black leather jacket leaning beside it, rain-soaked street, cinematic night photo.
An adult man in a white towel by a hotel window at dawn, city skyline behind him, soft side light, natural skin texture, editorial photograph.
Wide frame: an adult couple in silk robes on a yacht deck at sunset, golden light on the water, relaxed candid moment, 35mm film look.
Edit: change the outfit of the adult woman in the first picture to the emerald evening gown from the second picture; keep her face, hair and pose.
Edit: move the adult subject of this picture to a candlelit wine cellar and warm up the light; keep the framing and the expression unchanged.
Tips
- Put any words that must appear in the picture in quotes, and say where they go: on a sign, a label or a shirt.
- Describe materials and light concretely; 'brushed steel' and 'low window light' help more than generic quality words.
- For edits, place the picture whose framing you want to keep first; with no size chosen, the result inherits it.
- Keep each edit to one change per run, then chain runs when you need several changes.
- Lock the seed once a composition works, and vary one detail at a time to compare results fairly.
Specifications
| Size (Text to image): | 1024×1024 (1:1)1248×832 (3:2)832×1248 (2:3)1152×864 (4:3)864×1152 (3:4)1360×768 (16:9)768×1360 (9:16) |
|---|---|
| Size (Image to image): | 1K · Matches input image1024×1024 (1:1)1248×832 (3:2)832×1248 (2:3)1152×864 (4:3)864×1152 (3:4)1360×768 (16:9)768×1360 (9:16) |
| Reference images: | 1–3 reference images |
See also: uncensored AI image generator · uncensored image editor.
Pricing
Text to image
| Size | Credits |
|---|---|
| 1024×1024 (1:1) | 5 credits |
| 1248×832 (3:2) | 5 credits |
| 832×1248 (2:3) | 5 credits |
| 1152×864 (4:3) | 5 credits |
| 864×1152 (3:4) | 5 credits |
| 1360×768 (16:9) | 5 credits |
| 768×1360 (9:16) | 5 credits |
Image to image
| Size | Credits |
|---|---|
| 1K · Matches input image | 5 credits |
| 1024×1024 (1:1) | 5 credits |
| 1248×832 (3:2) | 5 credits |
| 832×1248 (2:3) | 5 credits |
| 1152×864 (4:3) | 5 credits |
| 864×1152 (3:4) | 5 credits |
| 1360×768 (16:9) | 5 credits |
| 768×1360 (9:16) | 5 credits |
FLUX.2 Klein 9B vs Qwen Image 2.1 and Pruna P-Image
FLUX.2 Klein 9B is the Black Forest Labs option among the image models on Vellria: a compact FLUX.2 model for realistic fresh images and short instruction edits at one flat price, with clean lettering as its particular strength.
| Model | Price | Max size | Reference images |
|---|---|---|---|
| Flux 2 Klein 9B Uncensored This page | 5 credits | 1024×1024 | Up to 3 |
| Qwen Image 2.1 Uncensored | from 7 credits | 1184×896 | Up to 10 |
| Pruna P-Image Uncensored | 4 credits | 1024×1024 | Up to 5 |
Prices and limits come from the live model catalog.
FLUX.2 Klein 9B or Qwen Image 2.1?
- Price: from 7 credits (FLUX.2 Klein 9B: 5 credits)
- Max size: 1184×896 (FLUX.2 Klein 9B: 1024×1024)
- Reference images: Up to 10 (FLUX.2 Klein 9B: Up to 3)
- Extra reference images: +1 credit per extra image (FLUX.2 Klein 9B: No extra charge)
Qwen Image 2.1 takes many more reference pictures and lets the prompt name each one, at a small charge per extra picture. Pick it for scenes assembled from several sources, and this model for realism and readable text.
FLUX.2 Klein 9B or Pruna P-Image?
- Price: 4 credits (FLUX.2 Klein 9B: 5 credits)
- Reference images: Up to 5 (FLUX.2 Klein 9B: Up to 3)
Pruna P-Image is quicker and cheaper and accepts a few more pictures in an edit. Use it to explore ideas in bulk, then rerun the keeper here when detail and lettering need to hold up.
FLUX.2 Klein 9B API: price and a first request
FLUX.2 Klein 9B costs 5 credits over the API, the same rate as in Studio. Model id vellria-flux-2-klein-9b on POST /v1/generate/image.
curl https://vellria.com/v1/generate/image \
-H "Authorization: Bearer vll_..." \
-H "Content-Type: application/json" \
-d '{
"model": "vellria-flux-2-klein-9b",
"prompt": "…",
"size": "1024*1024"
}'Parameters, polling and uploads: API documentation · NSFW image API.
FAQ
Does FLUX.2 Klein 9B allow NSFW?
Yes, for fictional adult content: nudity and explicit scenes between adults are allowed in fresh images and in edits. Minors are refused automatically, and editing real people without their consent is prohibited.
Is FLUX.2 Klein 9B free?
No, there is no free plan, but a new account created with Google gets 20 credits as a gift, valid for 7 days: enough to try FLUX.2 Klein 9B, which costs 5 credits. After that every run is paid from prepaid credits at the rate this page shows before you start, and a run that fails at the provider is refunded automatically. Is there a free uncensored AI generator? covers the cheapest way to a first result.
Who makes FLUX.2 Klein 9B?
Black Forest Labs, the team behind the FLUX models. Klein is the compact line of the FLUX.2 family and this is its nine-billion-parameter version; on Vellria it runs hosted as an online generator and API.
Can it render text in images?
Yes, that is one of its strengths. Put the exact words in quotes and say where they appear; short phrases on signs, labels and clothing come out most reliably, while long blocks of small text can still break.
What shape does an edit come back in?
With no size chosen, the result follows the proportions of the first picture you attach. You can also pick one of the seven sizes, and the edit is framed to it at the same price.
Can I use FLUX.2 Klein 9B through the API?
Yes. The API section on this page shows the request for text and for edits; see the API reference for uploading reference pictures and polling for the result.
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