Flux 2 Klein 4B Edit LoRA | Custom LoRA Image API

FLUX.2 Klein 4B Edit LoRA

FLUX.2 Klein 4B Edit LoRA is a lightweight yet powerful image editing model with full LoRA support. Upload images, describe your edits, and optionally apply up to 3 custom LoRA adapters for personalized styles — all with fast generation and affordable pricing.

Why Choose This?

Text-guided editing Describe edits in natural language — transform styles, modify content, apply effects, and more.
LoRA support Apply up to 3 custom LoRA adapters for personalized styles, characters, or visual aesthetics.
Multi-image input Upload up to 4 reference images for context-aware editing.
Flexible output sizing Optionally set output size, or leave empty to match input image dimensions.
Prompt Enhancer Built-in tool to automatically improve your prompts for better results.
Lightweight and fast 4B parameter model optimized for quick turnaround at affordable pricing.

Parameters

Parameter	Required	Description
prompt	Yes	Text description of the desired edit
images	Yes	Source images to edit (up to 4 images)
loras	No	List of LoRA adapters to apply (up to 3)
size	No	Output dimensions (empty = same as input image)
seed	No	Random seed for reproducibility (-1 for random)

LoRA Format

Each LoRA in the loras array has:

path (required) — URL to the LoRA weights file
scale (optional) — Weight multiplier, default 1

How to Use

Write your prompt — describe the edit you want (e.g., "make it a real picture", "add sunset lighting").
Upload images — add up to 4 source images using "+ Add Item" button.
Add LoRAs (optional) — click "+ Add Item" to include custom LoRA adapters.
Set size (optional) — specify output dimensions or leave empty to match input.
Set seed — use -1 for random, or specify a number for reproducibility.
Run — submit and download the edited image.

Pricing

Item	Cost
Per image	$0.017

Simple flat-rate pricing regardless of image size or LoRA count.

Best Use Cases

Style Transfer — Transform images with custom LoRA styles.
Reality Enhancement — Convert illustrations or renders to photorealistic images.
Character Consistency — Apply character LoRAs while editing images.
Creative Retouching — Apply artistic edits with natural language and LoRA combinations.
Batch Editing — Affordable pricing enables large-scale image editing.

Pro Tips

Be specific in your prompt — clearly describe what should change.
Use LoRAs to add consistent styles across multiple edits.
Leave size empty to preserve original image dimensions.
Start with LoRA scale 1.0 and adjust based on results.
Use the same seed to compare different prompts or LoRA combinations.

Notes

Maximum 4 images can be uploaded per generation.
Up to 3 LoRAs can be applied simultaneously.
If size is not specified, output matches input image dimensions.
For best results, use high-quality source images.

Related Models

FLUX.2 Klein 4B Edit — Standard version without LoRA support.
FLUX.2 Pro — Flagship-quality text-to-image generation.
Qwen Image Edit 2511 — Image editing with bilingual text support.

Flux 2 Klein 4b Edit Lora API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/flux-2-klein-4b/edit-lora with your input as JSON. The endpoint returns a prediction id; poll the prediction endpoint until status flips to completed, then read the output URL from data.outputs[0]. Examples for Flux 2 Klein 4b Edit Lora below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/flux-2-klein-4b/edit-lora" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "seed": -1,
    "enable_sync_mode": false,
    "enable_base64_output": false
}'

# Response includes a prediction id. Poll for the result:
curl -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY"

# When status is "completed", read the output from data.outputs[0].

Node.js example

// npm install wavespeed
const WaveSpeed = require('wavespeed');

const client = new WaveSpeed(); // reads WAVESPEED_API_KEY from env

const result = await client.run("wavespeed-ai/flux-2-klein-4b/edit-lora", {
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "seed": -1,
        "enable_sync_mode": false,
        "enable_base64_output": false
});

console.log(result.outputs[0]); // → URL of the generated output

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "wavespeed-ai/flux-2-klein-4b/edit-lora",
    {
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "seed": -1,
    "enable_sync_mode": false,
    "enable_base64_output": false
}
)

print(output["outputs"][0])  # → URL of the generated output

Flux 2 Klein 4b Edit Lora API — Frequently asked questions

What is the Flux 2 Klein 4b Edit Lora API?

Flux 2 Klein 4b Edit Lora is a WaveSpeedAI model for AI inference, exposed as a REST API on WaveSpeedAI. FLUX.2 [klein] 4B Edit with LoRA support enables precise image-to-image editing with natural language instructions, multi-reference support, and LoRA customization. Ready-to-use REST inference API, best performance, no cold starts, affordable pricing. You can call it programmatically or try it from the playground above.

How do I call the Flux 2 Klein 4b Edit Lora API?

POST your input parameters to the model's REST endpoint (shown in the API tab of this playground) with your WaveSpeedAI API key in the Authorization header. Submission returns a prediction ID; poll the prediction endpoint until status flips to "completed", then read the output URL from the result. The playground generates a ready-to-paste code sample in Python, JavaScript, or cURL for whatever inputs you've set. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/wavespeed-ai/flux-2-klein-4b-edit-lora.

How much does Flux 2 Klein 4b Edit Lora cost per run?

Flux 2 Klein 4b Edit Lora starts at $0.017 per run. That figure is the base price — the final charge scales with the parameters you set in the form (output size, length, count, references, or whatever knobs this model exposes), so a higher-quality or larger output costs more than a minimal one. The exact cost for your current input is shown live next to the Generate button before you submit, and the actual per-call charge is recorded on the prediction afterwards.

What inputs does Flux 2 Klein 4b Edit Lora accept?

Key inputs: `prompt`, `images`, `seed`, `enable_base64_output`, `enable_sync_mode`, `loras`. The full JSON schema (types, defaults, allowed values) is rendered above the Generate button and mirrored in the API reference at https://wavespeed.ai/docs/docs-api/wavespeed-ai/flux-2-klein-4b-edit-lora.

How long does Flux 2 Klein 4b Edit Lora take to generate?

Average end-to-end generation time on WaveSpeedAI is around 23 seconds per request — measured across recent runs. Queue time scales with global demand; live status is visible in the prediction record.

Can I use Flux 2 Klein 4b Edit Lora outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (WaveSpeedAI). The license summary appears on the model card above; see WaveSpeedAI's Terms of Service for platform-level conditions.

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