Flux 2 Klein 9b Edit
Playground
Try it on WavespeedAI!FLUX.2 [klein] 9B Edit is a high-quality image editing model with 9B parameters, offering precise modifications using natural language instructions. Ready-to-use REST inference API, best performance, no cold starts, affordable pricing.
Features
FLUX.2 Klein 9B Edit
FLUX.2 Klein 9B Edit is a powerful image editing model with 9B parameters. Upload images and describe your edits in natural language — the model delivers higher quality transformations and better prompt understanding than the 4B variant.
Why Choose This?
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Enhanced editing quality 9B parameter model delivers richer detail and better prompt interpretation than the 4B variant.
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Text-guided editing Describe edits in natural language — transform styles, modify content, combine elements, and more.
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Multi-image input Upload multiple reference images and combine elements across them (e.g., “Put the person in image1 into image2”).
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Flexible output sizing Optionally set output size, or leave empty to match input image dimensions.
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Prompt Enhancer Built-in tool to automatically improve your prompts for better results.
Parameters
| Parameter | Required | Description |
|---|---|---|
| prompt | Yes | Text description of the desired edit |
| images | Yes | Source images to edit (can add multiple) |
| size | No | Output dimensions (empty = same as input image) |
| seed | No | Random seed for reproducibility (-1 for random) |
How to Use
- Write your prompt — describe the edit you want (e.g., “Put the person in image1 into image2”, “Change to watercolor style”).
- Upload images — add source images using ”+ Add Item” button.
- 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 | $0.016 |
Simple flat-rate pricing regardless of image size.
Best Use Cases
- Image Compositing — Combine elements from multiple images seamlessly.
- Style Transfer — Transform images to different artistic styles with high fidelity.
- Professional Editing — When 4B quality isn’t enough for production work.
- Content Transformation — Change moods, lighting, or visual themes with precision.
- Complex Edits — Multi-image operations that require better understanding.
Pro Tips
- Be specific in your prompt — clearly describe what should change.
- Reference images by number in prompts (e.g., “Put the person in image1 into image2”).
- Leave size empty to preserve original image dimensions.
- Use the same seed to compare different prompts on the same images.
Notes
- If size is not specified, output matches input image dimensions.
- 9B model offers better detail than 4B at slightly higher cost.
- Need LoRA support? Try FLUX.2 Klein 9B Edit LoRA.
Related Models
- FLUX.2 Klein 9B Edit LoRA — Edit with LoRA support for custom styles.
- FLUX.2 Klein 4B Edit — Lighter 4B version at lower cost.
- FLUX.2 Klein 9B Text-to-Image — Text-to-image generation.
Authentication
For authentication details, please refer to the Authentication Guide.
API Endpoints
Submit Task & Query Result
# Submit the task
curl --location --request POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/flux-2-klein-9b/edit" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}" \
--data-raw '{
"seed": -1,
"enable_sync_mode": false,
"enable_base64_output": false
}'
# Get the result
curl --location --request GET "https://api.wavespeed.ai/api/v3/predictions/${requestId}/result" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}"
Parameters
Task Submission Parameters
Request Parameters
| Parameter | Type | Required | Default | Range | Description |
|---|---|---|---|---|---|
| prompt | string | Yes | - | ||
| images | array | Yes | [] | 1 ~ 3 items | List of reference image URLs (1-3 images). |
| size | string | No | - | 256 ~ 1536 per dimension | |
| seed | integer | No | -1 | -1 ~ 2147483647 | |
| enable_sync_mode | boolean | No | false | - | If set to true, the function will wait for the result to be generated and uploaded before returning the response. It allows you to get the result directly in the response. This property is only available through the API. |
| enable_base64_output | boolean | No | false | - | If enabled, the output will be encoded into a BASE64 string instead of a URL. This property is only available through the API. |
Response Parameters
| Parameter | Type | Description |
|---|---|---|
| code | integer | HTTP status code (e.g., 200 for success) |
| message | string | Status message (e.g., “success”) |
| data.id | string | Unique identifier for the prediction, Task Id |
| data.model | string | Model ID used for the prediction |
| data.outputs | array | Array of URLs to the generated content (empty when status is not completed) |
| data.urls | object | Object containing related API endpoints |
| data.urls.get | string | URL to retrieve the prediction result |
| data.has_nsfw_contents | array | Array of boolean values indicating NSFW detection for each output |
| data.status | string | Status of the task: created, processing, completed, or failed |
| data.created_at | string | ISO timestamp of when the request was created (e.g., “2023-04-01T12:34:56.789Z”) |
| data.error | string | Error message (empty if no error occurred) |
| data.timings | object | Object containing timing details |
| data.timings.inference | integer | Inference time in milliseconds |
Result Request Parameters
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
| id | string | Yes | - | Task ID |
Result Response Parameters
| Parameter | Type | Description |
|---|---|---|
| code | integer | HTTP status code (e.g., 200 for success) |
| message | string | Status message (e.g., “success”) |
| data | object | The prediction data object containing all details |
| data.id | string | Unique identifier for the prediction, the ID of the prediction to get |
| data.model | string | Model ID used for the prediction |
| data.outputs | string | Array of URLs to the generated content (empty when status is not completed). |
| data.urls | object | Object containing related API endpoints |
| data.urls.get | string | URL to retrieve the prediction result |
| data.status | string | Status of the task: created, processing, completed, or failed |
| data.created_at | string | ISO timestamp of when the request was created (e.g., “2023-04-01T12:34:56.789Z”) |
| data.error | string | Error message (empty if no error occurred) |
| data.timings | object | Object containing timing details |
| data.timings.inference | integer | Inference time in milliseconds |