--- title: Flux Klien 9B API | Image to Image | ModelsLab description: Flux Klein 9B is a powerful AI text-to-image & image-to-image model that transforms existing images using text prompts. url: https://modelslab.com/models/modelslab/flux-klien-9B-image-to-image.md canonical: https://modelslab.com/models/modelslab/flux-klien-9B-image-to-image type: product component: Playground/Endpoint/Index generated_at: 2026-10-08T22:18:06.902364Z --- [![Flux Klien 9B thumbnail](https://assets.modelslab.ai/api-logos/01KPMZY676ZM0Z7YJWBM9C78QP.png)](https://modelslab.com/models/modelslab)Flux Klien 9B --- [by ModelsLab](https://modelslab.com/models/modelslab)Flux Klien 9B Model transform an existing image into a new version using a text prompt, rather than generating a picture from scratch. You upload a source image and then describe how you want it changed `flux-klein` Open Source Model [Unlimited Usage](https://modelslab.com/pricing) [LLMs.txt](https://modelslab.com/models/modelslab/flux-klein/llms.txt) [Learn more](https://modelslab.com/flux-klien-9b) EndpointSelect Endpoint [API Playground](/models/modelslab/flux-klien-9B-image-to-image)API DocumentationVibe CodeRelated ModelsDeveloper SupportModel Specs Input --- Reference Image Add Images orAdd URL File preview Prompt Young woman in red Hanfu, intricate embroidery. Impeccable makeup, red floral forehead pattern. Elaborate high bun, golden phoenix headdress, red flowers, beads. Holds round folding fan with lady, trees, bird. Neon lightning-bolt lamp, bright yellow glow, above extended left palm. Soft-lit outdoor night background, silhouetted tiered pagoda, blurred colorful distant lights. Advanced Settings Customize your input with more control. **$0.0047** per image generation Login to Generate Output --- Idle Unknown content type Looking for something different? --- Models that trade off differently against the one you are viewing ### Better quality Newer flagship models that generally produce stronger results. 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API access starts at $21/month, and open-source models are unlimited on the $149/month plan. ### Technical Specifications Model IDflux-klein ProviderModelsLab CategoryImage Models TaskText to Image Price$0.0047 per generation AddedMarch 11, 2026 ### Key Features - High-resolution AI image generation from text prompts - Negative prompt support for precise control - Multiple output formats and aspect ratios - Adjustable inference steps and guidance scale - Batch generation support via API ### Quick Start Integrate Flux Klien 9B into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/pricing) to get started. PythonJavaScriptcURLPHP ``` import requests import json url = "https://modelslab.com/api/v6/images/img2img" headers = { "Content-Type": "application/json" } data = { "model_id": "flux-klein", "prompt": "your prompt here", "key": "YOUR_API_KEY" } try: response = requests.post(url, headers=headers, json=data) response.raise_for_status() # Raises an HTTPError for bad responses (4XX or 5XX) result = response.json() print("API Response:") print(json.dumps(result, indent=2)) except requests.exceptions.HTTPError as http_err: print(f"HTTP error occurred: {http_err} - {response.text}") except Exception as err: print(f"Other error occurred: {err}") ``` ### Pricing Flux Klien 9B API costs $0.0047 per generation. Plans start at $21/month, and open-source models are unlimited on the $149/month plan. [View pricing plans](https://modelslab.com/pricing) ### Use Cases - Product photography and e-commerce visuals - Marketing and social media content creation - Concept art and design prototyping - Custom illustrations and artwork [Flux API](/flux-api) [Learn more about Flux Klien 9B ](https://modelslab.com/flux-klien-9b) [Browse Image Models](https://modelslab.com/models?feature=imagen) [More from ModelsLab](https://modelslab.com/models/modelslab) [View Pricing](https://modelslab.com/pricing) Flux Klien 9B FAQ --- ### What is Flux Klien 9B ? Flux Klien 9B is a text to image AI model by ModelsLab available on ModelsLab. API access starts at $21/month, and open-source models are unlimited on the $149/month plan. ### How do I use the Flux Klien 9B API? You can integrate Flux Klien 9B into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "flux-klein" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does Flux Klien 9B cost? Flux Klien 9B costs $0.0047 per generation. ModelsLab plans start at $21/month (Basic), and the $149/month Open Source plan includes unlimited generation on open-source models. ### What is the Flux Klien 9B model ID? The model ID for Flux Klien 9B is "flux-klein". Use this ID in your API requests to specify this model. ### Do I need a paid plan to use Flux Klien 9B ? Yes. ModelsLab is subscription-based with no free tier — plans start at $21/month (Basic, 3,250 API calls). The $149/month Open Source Unlimited plan includes unlimited generation across open-source models; premium third-party models are billed per call from your wallet. --- *This markdown version is optimized for AI agents and LLMs.* **Links:** - [Website](https://modelslab.com) - [API Documentation](https://docs.modelslab.com) - [Blog](https://modelslab.com/blog) --- *Generated by ModelsLab - 2026-10-09*