Flux 2 Klein 4B

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flux-2-klein-4b

Black Forest Labs|Created Jan 22, 2026

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FLUX.2 [klein] 4B is the quickest and most budget-friendly model in the FLUX.2 family, designed for high-throughput workloads while still delivering excellent image quality.

Overview Specifications Activity Performance Uptime Examples API Reference

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Pricing-50%

Pay-as-you-go rates for this model. More details can be found here.

Image

$0.007

Capabilities

Input Modalities

TextImage

Output Modalities

Image

Supported Parameters

Available parameters for API requests

Size

Usage Analytics

Token usage of this model on our platform

Throughput

Time-To-First-Token (TTFT)

Not enough TTFT data

Code Example

Example code for using this model through our API with Python (OpenAI SDK) or cURL. Replace placeholders with your API key and model ID.

Basic request example. Ensure API key permissions. For more details, see our documentation.

from openai import OpenAI

client = OpenAI(base_url="https://api.naga.ac/v1", api_key="YOUR_API_KEY")

resp = client.images.edit(
    model="flux-2-klein-4b",
    image=open("image.png", "rb"),
    prompt="A cute baby sea otter wearing a beret",
    n=1,
    size="1024x1024",
    response_format="url"
)
print(resp.data)