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FLUX: FLUX.3 Image KleinNEW
black-forest-labs/flux-3-image-kleinimages
FLUX 3 Image Klein is an open-weights image generation and editing model from Black Forest Labs. It is suited for text-to-image, multi-reference editing that keeps characters and subjects consistent across images, reference-based style transfer, and text rendering. At 5.6B parameters, it is the smaller, faster member of the FLUX 3 Image family.
Price
Context / Max output
46.9K / 46.9K
Released
Oct 15, 2026
Parameters
promptrequiredaspect_ratio1:11:22:12:33:23:44:34:55:45:77:59:169:2116:921:9resolutionsize438x10241024x438512x10241024x512576x10241024x576682x10241024x682768x10241024x768818x10241024x8181024x1024876x20482048x8761024x20482048x10241152x20482048x11521364x20482048x13641536x20482048x15361638x20482048x16382048x20481754x40964096x17542048x40964096x20482304x40964096x23042730x40964096x27303072x40964096x30723276x40964096x32764096x4096imageimage-to-image (via /v1/images/edits)How to use via API
import base64
from openai import OpenAI
client = OpenAI(base_url="https://api.mixen.ai/v1", api_key="mxn-...")
img = client.images.generate(
model="black-forest-labs/flux-3-image-klein",
prompt="Милый кот-космонавт на Марсе",
size="438x1024", # либо extra_body={"aspect_ratio": "1:1", "resolution": "768"}
n=1,
)
with open("image.png", "wb") as f:
f.write(base64.b64decode(img.data[0].b64_json))
# image-to-image: передать референс(ы) через multipart
edited = client.images.edit(
model="black-forest-labs/flux-3-image-klein",
image=open("photo.png", "rb"), # один или несколько референсов
prompt="Добавь неоновую вывеску на фасад, сохрани композицию",
)
with open("edited.png", "wb") as f:
f.write(base64.b64decode(edited.data[0].b64_json))
