Flux 2 Klein 4b Edit

Flux 2 Klein 4b Edit

Playground

FLUX.2 [klein] 4B Edit enables precise image-to-image editing with natural language instructions and multi-reference support. Ready-to-use REST inference API, best performance, no cold starts, affordable pricing.

Features

FLUX.2 Klein 4B Edit is a lightweight yet powerful image editing model. Upload images and describe your edits in natural language — the model transforms styles, modifies content, and applies effects 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.

• Multi-image input Upload multiple 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 the lowest cost.

Parameters

How to Use

1. Write your prompt — describe the edit you want (e.g., “Change image1 to the comic style”, “add sunset lighting”).
2. Upload images — add source images using ”+ Add Item” button.
3. Set size (optional) — specify output dimensions or leave empty to match input.
4. Set seed — use -1 for random, or specify a number for reproducibility.
5. Run — submit and download the edited image.

Pricing

Simple flat-rate pricing regardless of image size.

Best Use Cases

• Style Transfer — Transform images to comic, anime, painting, or other styles.
• Quick Edits — Fast, affordable edits for creative iteration.
• Batch Processing — Low cost enables large-scale image editing.
• Content Transformation — Change moods, lighting, or visual themes.
• Prototyping — Rapidly test editing ideas before using higher-tier models.

Pro Tips

• Be specific in your prompt — clearly describe what should change.
• Leave size empty to preserve original image dimensions.
• Use the same seed to compare different prompts on the same image.
• Reference images by number in prompts (e.g., “Change image1 to…”).

Notes

• If size is not specified, output matches input image dimensions.
• For best results, use high-quality source images.
• Need LoRA support? Try FLUX.2 Klein 4B Edit LoRA.

Related Models

• FLUX.2 Klein 4B Edit LoRA — Edit with LoRA support for custom styles.
• FLUX.2 Klein 9B Edit — Higher quality 9B version.
• FLUX.2 Klein 4B Text-to-Image — Text-to-image generation.

Authentication

For authentication details, please refer to the Authentication Guide.

API Endpoints

Submit Task & Query Result

set -euo pipefail

export WAVESPEED_API_KEY="your-api-key"

REQUEST_BODY=$(cat <<'JSON'
{
  "prompt": "A cinematic ocean wave at sunrise, highly detailed",
  "images": [
    "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg"
  ],
  "seed": -1
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/flux-2-klein-4b/edit" \
  -H "Authorization: Bearer ${WAVESPEED_API_KEY}" \
  -H "Content-Type: application/json" \
  -d "${REQUEST_BODY}")

TASK=$(printf '%s' "${SUBMIT_RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
PREDICTION_ID=$(printf '%s' "${TASK}" | jq -r '.id // empty')
if [ -z "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL=$(printf '%s' "${TASK}" | jq -r '.urls.get // empty')
if [ -z "${RESULT_URL}" ]; then RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/${PREDICTION_ID}/result"; fi

# 2. Poll until the prediction finishes.
while true; do
  RESPONSE=$(curl --silent --show-error --fail-with-body \
    "${RESULT_URL}" \
    -H "Authorization: Bearer ${WAVESPEED_API_KEY}")
  RESULT=$(printf '%s' "${RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
  STATUS=$(printf '%s' "${RESULT}" | jq -r '.status // empty')

  case "${STATUS}" in
    completed) printf '%s\n' "${RESULT}" | jq '.outputs'; break ;;
    failed|cancelled|timeout) printf '%s\n' "${RESULT}" | jq . >&2; exit 1 ;;
    created|processing) sleep 2 ;;
    *) printf 'Unexpected status: %s
' "${STATUS}" >&2; exit 1 ;;
  esac
done

Parameters

Task Submission Parameters

Request Parameters

Response Parameters

Result Request Parameters

Result Response Parameters