Use the FLUX 3 Klein API for prompt-based image generation and reference-guided editing, alongside FLUX.2 Klein 4B, 9B, Turbo, LoRA, and style-training endpoints. Choose 1K, 2K, or 4K outputs through one asynchronous API.
FLUX 3 Klein FLUX 3 Klein Text to Image is a live Muapi endpoint for text-to-image. Submit it with one API key and poll the shared result endpoint.
FLUX 3 Klein FLUX 3 Klein Image Edit is a live Muapi endpoint for image editing. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 4b is a live Muapi endpoint for text-to-image. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 4b Edit is a live Muapi endpoint for image editing. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 9b is a live Muapi endpoint for text-to-image. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 9b Edit is a live Muapi endpoint for image editing. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 4b Turbo is a live Muapi endpoint for text-to-image. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 4b Turbo Edit is a live Muapi endpoint for image editing. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 9b Turbo is a live Muapi endpoint for text-to-image. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 9b Turbo Edit is a live Muapi endpoint for image editing. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 4b Text To Image LoRA is a live Muapi endpoint for LoRA inference. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 9b Text To Image LoRA is a live Muapi endpoint for LoRA inference. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 4b Edit LoRA is a live Muapi endpoint for LoRA inference. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 9b Edit LoRA is a live Muapi endpoint for LoRA inference. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 4b Style LoRA Trainer is a live Muapi endpoint for LoRA training. Submit it with one API key and poll the shared result endpoint.
FLUX.2 FLUX 2 Klein 9b Style LoRA Trainer is a live Muapi endpoint for LoRA training. Submit it with one API key and poll the shared result endpoint.
The FLUX Klein API brings the compact Black Forest Labs image family to one developer endpoint catalog. FLUX 3 Klein adds text-to-image generation and instruction-based editing with 1K, 2K, or 4K output, multiple image results, aspect-ratio controls, and PNG, JPEG, or WebP formats. FLUX.2 Klein remains available in 4B, 9B, Turbo, LoRA inference, and style-training variants.
Use the FLUX 3 Klein API when you want resolution-selectable image generation or edits in a straightforward asynchronous workflow. Compare the 4B and 9B FLUX.2 Klein options for a different model generation, or browse the broader [FLUX.2 API](/flux-2) and [FLUX 3 API](/flux-3) catalogs. Each Muapi request uses the same API key, request ID, result polling endpoint, and optional webhook pattern.
Create images from text prompts at 1K, 2K, or 4K with nine aspect ratios, three output formats, prompt enhancement, and up to four results per request.
Send 1–10 reference image URLs and a natural-language edit prompt. Choose automatic or fixed framing and request up to four outputs.
Compare 4B, 9B, and Turbo text-to-image and editing models, plus the listed LoRA inference endpoints.
Submit an asynchronous request, poll its result ID, or provide a webhook URL for completion notifications.
Generate or edit images with FLUX 3 Klein, then retrieve image URLs from the standard Muapi result endpoint.
curl -X POST https://api.muapi.ai/api/v1/flux-3-klein-text-to-image \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"A sculptural glass perfume bottle on a warm limestone plinth, soft editorial light","resolution":"2K","aspect_ratio":"4:3","num_images":2}'
# Response: {"request_id":"REQUEST_ID"}Select resolution, aspect ratio, output format, and image count. The listed price is per output image.
curl -X POST https://api.muapi.ai/api/v1/flux-3-klein-edit-image \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"Replace the plain background with a warm limestone studio, preserving the product shape","images_list":["https://example.com/product.jpg"],"resolution":"2K","aspect_ratio":"auto"}'Provide one to ten publicly accessible reference image URLs and describe the requested edit.
curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \ -H "x-api-key: YOUR_API_KEY"
Read completed image URLs from the outputs array.
It is an asynchronous API for generating images from prompts and editing reference images with the FLUX 3 Klein model. The endpoint supports 1K, 2K, and 4K image outputs.
Muapi charges $0.009 per 1K output image, $0.014 per 2K output image, and $0.036 per 4K output image. A request for multiple outputs is charged per image.
Yes. Call `flux-3-klein-edit-image`, provide 1–10 public URLs in `images_list`, and describe the edit in `prompt`. FLUX.2 Klein also has separate editing endpoints in the catalog.
Set `num_images` from 1 to 4. Pricing is calculated per generated output image.
Choose PNG, JPEG, or WebP. Text-to-image supports 1:1, 4:3, 3:4, 3:2, 2:3, 16:9, 9:16, 21:9, and 9:21. Editing also supports `auto` framing.
This catalog lists FLUX 3 Klein for 1K–4K text-to-image generation and editing, and FLUX.2 Klein for 4B/9B and Turbo image, editing, LoRA, and training endpoints. They are separate model generations with different available endpoints.
Use one API key to generate and edit images with FLUX 3 Klein, then compare its requests with FLUX.2 Klein variants.