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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Endpoints and request shape

This page collects the public integration surface for the model: supported endpoints, available request parameters, and example calls through the NagaAI API.

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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)

Supported Parameters

Available parameters for API requests

Size