FLUX.2 Klein 9B LoRA API

Introduction

FLUX.2 Klein 9B LoRA Image editing changes one to three source images from a written instruction on Black Forest Labs' step-distilled FLUX.2 [klein] 9B, with up to three of your own LoRA files loaded. Keep the source shape with auto or pick one of nine shapes at 1k or 2k. Most edits took about ten seconds of model time, there is no mask or strength control to tune, and nothing is filtered.

Choose a mode by starting material

Key features

Same person, new scene

In our tests the face and hair carried through changes of outfit and place: a man on a park bench in a hoodie came back on a car park roof at dusk in an open-collar shirt, still clearly the same person.

Up to three sources

Two head-and-shoulders portraits taken apart became one couple at a lit fountain, each keeping their face. With two or three sources, faces and hair can drift a little, so check each person before you use the result.

LoRAs on edits

A film or analog LoRA sets the grade of the edited picture.

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 4 credits per image ($0.04).

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

Use cases

Wardrobe and location changes

Move a person into a new place and outfit in one pass while keeping their likeness, for lookbooks, mood boards and character sheets.

Putting people together

Combine two or three portraits into one scene, then restyle the result with a LoRA so the series matches.

Fast retouch rounds

At about ten seconds per edit you can try several instructions and LoRA strengths on the same photo and keep the best version, instead of settling for the first attempt.

Prompt guide & pro tips

Protect first, then change

Start the instruction with what must stay the same, such as face, hair and expression, then describe the change in concrete terms: the garment, the place and the light. Short, specific instructions held faces better than long lists in our tests.

Give each source a role

With several images, say what each one brings: the woman from the first image, the man from the second, the room from the third. The order in your prompt should match the upload order.

Lower a LoRA that changes faces

If the person stops looking like the source, take the LoRA scale down by 0.2 and run the same seed again. Anatomy LoRAs are the usual cause; style LoRAs rarely move a face.

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/edit 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/edit",
  "input": {
    "prompt": "A ceramic teapot on a linen cloth, soft window light, muted palette",
    "image_urls": [
      "https://media.popnow.ai/influencer/examples/marco.webp"
    ],
    "aspect_ratio": "auto",
    "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