Flux 2 Klein Base 9B Text to Image LoRA | Custom LoRA Image API

WaveSpeed AI FLUX.2 Klein Base 9B Text-to-Image LoRA

WaveSpeed AI FLUX.2 Klein Base 9B Text-to-Image LoRA is a high-quality text-to-image generation model with full LoRA support. Built on a 9B-parameter architecture, it delivers stronger detail, better prompt understanding, and more reliable visual fidelity than the 4B variant, while remaining fast and cost-effective for production workflows.

Why Choose This?

Higher-quality generation The 9B model produces richer detail, stronger prompt adherence, and more refined outputs than the 4B variant.
Full LoRA support Apply custom LoRA adapters for personalized styles, characters, aesthetics, or branded visual directions.
Flexible image sizing Set custom width and height directly for the exact output dimensions you need.
Prompt Enhancer Built-in prompt enhancement can help improve image quality and prompt clarity.
Balanced speed and quality More capable than the 4B version while still remaining practical for fast creative iteration.
Production-ready workflow Suitable for custom character work, visual branding, style control, and other high-quality generation tasks.

Parameters

Parameter	Required	Description
prompt	Yes	Text description of the image you want to generate.
width	No	Output width in pixels. Default: `1024`.
height	No	Output height in pixels. Default: `1024`.
loras	No	List of LoRA adapters to apply during generation.
seed	No	Random seed for reproducibility. Use `-1` for random generation.

LoRA Format

Each item in the loras array supports:

Field	Required	Description
path	Yes	URL to the LoRA weights file.
scale	No	LoRA weight multiplier. Default: `1`.

How to Use

Write your prompt — describe the subject, style, lighting, composition, and mood you want.
Set the image size — choose width and height for your desired output dimensions.
Add LoRAs (optional) — include one or more LoRA adapters if you want custom style or character control.
Adjust LoRA scale (optional) — start with 1 and fine-tune if needed.
Set a seed (optional) — use -1 for random generation, or a fixed value for reproducible results.
Submit — run the model and download the generated image.

Example Use Case

Generate a cinematic fantasy portrait using a custom character LoRA and a painterly style LoRA, with dramatic lighting and highly detailed textures.

Pricing

Item	Cost
Per image	$0.02

Billing Rules

Pricing is fixed at $0.02 per generated image
width, height, seed, and the number of LoRAs do not affect pricing
Flat-rate pricing applies regardless of image dimensions or LoRA count

Best Use Cases

Custom character generation — Apply character LoRAs for more consistent identity across generations.
Style personalization — Use style LoRAs to create distinctive visual aesthetics.
Brand content creation — Generate on-brand visuals using custom-trained LoRA styles.
High-quality creative work — Use the 9B model when the 4B variant is not enough for production quality.
Professional content generation — Balance strong detail and prompt fidelity with practical cost and speed.
Hybrid visual control — Combine multiple LoRAs for more specialized outputs, such as character + style workflows.

Pro Tips

Be specific in your prompt about subject, style, lighting, colors, and atmosphere.
Start with LoRA scale = 1 and adjust based on how strongly you want the adapter to influence the result.
Combine multiple LoRAs carefully when you want hybrid effects.
Use the same seed when comparing different prompts or LoRA combinations.
If a LoRA relies on trigger words, include them in your prompt.
Start with standard dimensions like 1024 × 1024, then adjust once the concept is working well.

Notes

prompt is required.
width and height default to 1024.
seed = -1 means random generation.
LoRAs can be stacked for combined effects.
For best results, use LoRAs trained on FLUX-compatible models.
The 9B model offers better detail and prompt understanding than the 4B variant at a slightly higher cost.

Related Models

FLUX.2 Klein Base 9B Text-to-Image — Standard version without LoRA support.
FLUX.2 Klein 4B Text-to-Image LoRA — Lighter 4B version at lower cost.
FLUX.2 Pro — Flagship-quality text-to-image generation.

Flux 2 Klein Base 9b Text To Image Lora API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/flux-2-klein-base-9b/text-to-image-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 Base 9b Text To Image Lora below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/flux-2-klein-base-9b/text-to-image-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",
    "size": "1024*1024",
    "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-base-9b/text-to-image-lora", {
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "size": "1024*1024",
        "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-base-9b/text-to-image-lora",
    {
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "size": "1024*1024",
    "seed": -1,
    "enable_sync_mode": false,
    "enable_base64_output": false
}
)

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

Flux 2 Klein Base 9b Text To Image Lora API — Frequently asked questions

What is the Flux 2 Klein Base 9b Text To Image Lora API?

Flux 2 Klein Base 9b Text To Image Lora is a WaveSpeedAI model for AI inference, exposed as a REST API on WaveSpeedAI. FLUX.2 [klein] Base 9B with LoRA support is a high-quality text-to-image model with 9B parameters, offering enhanced realism, crisper text generation, and fast 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 Base 9b Text To Image 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-base-9b-text-to-image-lora.

How much does Flux 2 Klein Base 9b Text To Image Lora cost per run?

Flux 2 Klein Base 9b Text To Image Lora starts at $0.020 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 Base 9b Text To Image Lora accept?

Key inputs: `prompt`, `size`, `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-base-9b-text-to-image-lora.

How do I get started with the Flux 2 Klein Base 9b Text To Image Lora API?

Sign up for a free WaveSpeedAI account to claim starter credits, copy your API key from /accesskey, then call the endpoint shown in the API tab of the playground. The playground also auto-generates a code sample in Python, JavaScript, or cURL for the parameters you've set.

Can I use Flux 2 Klein Base 9b Text To Image 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.

ExamplesView all

Related Models

README

WaveSpeed AI FLUX.2 Klein Base 9B Text-to-Image LoRA

Why Choose This?

Parameters

LoRA Format

How to Use

Example Use Case

Pricing

Billing Rules

Best Use Cases

Pro Tips

Notes

Related Models

Flux 2 Klein Base 9b Text To Image Lora API — Quick start

Flux 2 Klein Base 9b Text To Image Lora API — Frequently asked questions