FLUX.2 Klein 9B LoRA API

About FLUX.2 Klein 9B LoRA

FLUX.2 Klein 9B LoRA runs Black Forest Labs' step-distilled FLUX.2 [klein] 9B with up to three of your own LoRA files per request. Text to image comes in nine aspect ratios at 1k or 2k, and editing takes one to three reference images. Most of our test images came back in about ten seconds, at one flat price per image, with no review of prompts, weights or results.

Call it with the model name black-forest-labs/flux-2-klein-9b-lora/text-to-image on POST /jobs/createTask, from 3 credits per image ($0.03). New accounts get 30 free credits to try it in the Playground first.

Introduction

FLUX.2 Klein 9B LoRA Text to image draws one image from a written prompt on Black Forest Labs' FLUX.2 [klein] 9B, the step-distilled 9B model, with up to three of your own LoRA files loaded from direct links. Choose one of nine aspect ratios at 1k or 2k and get a JPEG back, most often in about ten seconds of model time.

Choose a mode by starting material

Key features

Your LoRAs, both klein 9B builds

LoRAs trained on the distilled klein 9B and on klein Base 9B both loaded here in our tests. FLUX.1 and klein 4B LoRAs, and files saved in diffusers PEFT format, ran without an error and changed nothing, so check the base model on the LoRA's card before you use it.

Fast enough to iterate

That makes it practical to try a LoRA at three strengths and a few seeds in one sitting, then keep the best frame.

Request parameters

Pricing

Prices are in credits, the same credits you use on the website (1 credit = $0.01). The hold is taken when the task is accepted and settled to the actual charge when it finishes; failed tasks are refunded.

Each task is rounded up to whole credits, so one run at the lowest tier costs 3 credits per image ($0.03).

For an exact number before you run, send the same body to POST /jobs/quote.

Use cases

Run a hub LoRA as an API call

Paste a direct .safetensors link from a model hub, set the scale and write the prompt. There is nothing to train, host or keep warm, and up to three LoRAs stack in one request.

Prompt guide & pro tips

Trigger first, then sentences

Start with the LoRA's trigger phrase from its model card, then describe subject, clothing, place, light and lens in full sentences. The model follows long, specific prompts well, and there is no negative prompt, so say what you want rather than what to avoid.

Move the scale in small steps

Start at 0.8 to 1. In our tests 0.5 gave a faint version of a style and 4 broke the picture into blocks. Raise or lower by 0.2 and look at faces and hands first; they are the first things to distort.

Check that the LoRA is doing the work

Run the same prompt and seed with and without the file. Style LoRAs often refine a look the words already ask for, such as grain, grade or a pixel grid; LoRAs that teach new content change the picture outright. No visible change usually means the wrong base model.

Describe the clothes you want

Without a LoRA the model adds or keeps clothing on its own.

API quick start

Call the FLUX.2 Klein 9B LoRA API in three steps

1. Create an API key. Sign in to PopNow and create a key in the API console. Keys start with sk-popnow- and use the same credits as the website.
2. Send the request. POST /jobs/createTask with model black-forest-labs/flux-2-klein-9b-lora/text-to-image and an input object that follows the parameter table. The response returns a task ID straight away.
3. Get the result. Poll GET /jobs/recordInfo with the task ID, or pass a callBackUrl and we post the result to it. Download the output links when the task succeeds.

# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $IDEMPOTENCY_KEY" \
  -d '{
  "model": "black-forest-labs/flux-2-klein-9b-lora/text-to-image",
  "input": {
    "prompt": "A ceramic teapot on a linen cloth, soft window light, muted palette",
    "aspect_ratio": "1:1",
    "resolution": "1k"
  }
}'

# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

Replace the prompt and any links with your own. The API tab has the response, polling and callback reference.

FLUX.2 Klein 9B LoRA API questions

All FLUX models

FLUX.2 Klein Base 9B LoRA is the undistilled build: two to five times slower, with softer, more varied pictures. The distilled build is quicker and more polished.

• FLUX.2 Max APITop-tier FLUX: photoreal light and exact brand colorsFrom 11 credits per image
• FLUX 3 APIVideo with synced sound and a quick draft tierFrom 45 credits for a 5-second clip
• FLUX.2 Klein 9B LoRA APIFast FLUX.2 Klein 9B that loads up to three of your LoRAsFrom 3 credits per image
• FLUX.2 Klein Base 9B LoRA APIUndistilled Klein 9B for varied looks with your LoRAsFrom 4 credits per image
• FLUX.2 Klein 4B LoRA APISmall, quick FLUX.2 Klein 4B with your own LoRAsFrom 3 credits per image
• FLUX.2 Klein Base 4B LoRA APIUndistilled Klein 4B that loads your own LoRAsFrom 3 credits per image
• FLUX.2 Klein 9B APIFast FLUX edits that keep faces and poses intactFrom 2 credits per image
• FLUX.2 Klein 4B APIThe smallest, quickest FLUX for rapid draftsFrom 2 credits per image
• FLUX.2 Dev LoRA APIFLUX.2 Dev images and edits with your own LoRAsFrom 4 credits per image
• FLUX.2 Pro APIPhotoreal images with readable text and hex color controlFrom 5 credits per image
• FLUX.2 Flex APISpells headlines and labels exactly as writtenFrom 9 credits per image
• FLUX.2 Dev APIOpen-weights FLUX that can merge people into one sceneFrom 2 credits per image
• FLUX.1 Krea Dev LoRA APIPhotographic FLUX.1 Krea with your own LoRAsFrom 4 credits per image
• FLUX.1 Dev ControlNet LoRA APIPose, depth or edge control on FLUX.1 with your LoRAsFrom 6 credits per image
• FLUX.1 Fill Dev LoRA APIMasked inpainting on FLUX.1 Fill with your own LoRAsFrom 7 credits per image
• FLUX.1 Dev LoRA APIClassic FLUX.1 Dev with up to three of your LoRAsFrom 3 credits per image
• FLUX.1 Schnell LoRA APIFast FLUX.1 Schnell that loads your own LoRAsFrom 1 credit per image

Other image APIs

• Qwen Image 2.1 LoRA APIQwen Image 2.1 images and edits with up to three of your LoRAsFrom 5 credits per image
• MiniMax H3 Image LoRA APIH3 stills and edits with up to three of your LoRAsFrom 7 credits per image
• Anima Turbo LoRA APIAnime art with your own style or character LoRAsFrom 3 credits per image
• Krea 2 Turbo LoRA APIKrea 2 Turbo images and restyles with your own LoRAsFrom 4 credits per image
• P-Image LoRA APIFast P-Image renders and edits with one LoRA of your ownFrom 1 credit per image
• Z-Image Base LoRA APIZ-Image Base with up to three of your own LoRAsFrom 3 credits per image

More about FLUX.2 Klein 9B LoRA

Try it

FLUX.2 Klein 9B LoRA AI Image Generator onlineCreate images with FLUX.2 Klein 9B LoRA in PopNow

Docs

FLUX.2 Klein 9B LoRA model ID and input schema in the API docsPopNow API quickstart: your first request in five minutesImage generation guide for the PopNow APIWebhooks: get FLUX.2 Klein 9B LoRA results without polling