Black Forest Labs · 1 credits per image

FLUX 3 Klein

Fast FLUX for 1 credit an image

Try FLUX 3 Klein

FLUX 3 Klein is the smaller, faster version of Black Forest Labs' FLUX 3, released in October 2026. It has 5.6 billion parameters and open weights, and it still supports text-to-image, editing and multiple reference images.

At 1 credit per image it's tied with Muse Image as the cheapest model on AirGallery, which makes it a good way to explore a prompt before switching to a larger model for the final version.

Sample images

FLUX 3 Klein: A photo of a white ceramic coffee mug on a wooden cafe table next to a rain-streaked window, soft morning light. The mug is printed with the words "Good Morning" in black hand-lettered script.
Product photo with lettering
FLUX 3 Klein: A close-up portrait photo of an elderly fisherman with a weathered face, grey stubble and a navy knitted wool cap, a harbor at dusk softly out of focus behind him, shot on an 85mm lens.
Realistic portrait
FLUX 3 Klein: A flat vector travel poster of Lisbon: a yellow tram climbing a steep cobbled street, terracotta rooftops and the river behind. Bold headline at the top reading "LISBOA".
Illustrated poster

Every model on AirGallery gets the same three prompts, run once and shown unedited (November 2026). Compare them side by side.

Strengths

  • Cheapest model: 1 credit per image, generation or edit.
  • Quick results: Usually back in seconds, so you can try many variations.
  • Edits and references: Edit uploaded photos and combine several references, like full FLUX 3.

Best for

  • Drafts and prompt exploration
  • High-volume social images
  • Quick edits where speed beats fine detail

1 credits per image. Credits never expire, no subscription.

Questions

What is FLUX 3 Klein?

FLUX 3 Klein is Black Forest Labs' compact FLUX 3 model: 5.6 billion parameters, open weights, released in October 2026. It generates and edits images faster and more cheaply than full FLUX 3.

Is the quality as good as FLUX 3?

It's close for many prompts, but full FLUX 3 holds more fine detail. Use Klein to explore, then rerun your favorite prompt on FLUX 3 or Nano Banana Pro.

Can I use FLUX 3 Klein without a subscription?

Yes. AirGallery is pay-per-use: buy a credit pack once and each FLUX 3 Klein generation costs 1 credits. Credits never expire.

Do I need an API key to use FLUX 3 Klein?

No. AirGallery runs FLUX 3 Klein for you in the browser. Developers who want it in their own app can call it through the AirGallery API or MCP server with an AirGallery key.

Who owns the images I make with FLUX 3 Klein?

You do. Images you create are yours to download and use, subject to the model provider's usage policies and AirGallery's terms.

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