Flux 3 Image is now in Fenestra. Pick Flux 3 from the model list in Create or Edit and it works like every other model: drop in a view, write a prompt, add references if you want them.

Three things make it worth switching to for architecture and interior work:

• Edits stay local. Change a facade material or add a pendant and the pixels you did not mention are left as they were. You can keep refining one view without it drifting.
• Up to ten references in one generation. Your render plus material boards, furniture shots and a mood image, composed into a single frame.
• Native 2K and 4K output. 4K is around 16 megapixels straight from the model, so grain, stone and signage hold up on a printed board.

What is Flux 3?

Flux 3 Image is the new image model from Black Forest Labs, the team behind Flux 2 Pro and Flux 2 Klein, released on 1 October 2026. It generates and edits in one model, and the part that matters for design work is that it edits the region you describe and leaves the rest alone, so a chain of five edits lands where you planned. The full facts, prompts and FAQ are on the Flux 3 model page.

Is Flux 3 good for architecture and interior design?

Yes, and for a specific reason: it respects the drawing. Here is how the first tests went.

Exteriors. Season and sky are the obvious test. The cladding, the roof edge, the chimney and every sheep stayed put while the ground went white and the interior lights came on. Material swaps behave the same way: name the cladding and the openings are left alone.

Interiors with references. This is where references pay off. An empty timber room and one board of furniture, art and material samples went in together and came out as a composed room. The model works out where each piece belongs before it renders the frame, so the sofa lands at the right scale on the right wall and the room is left as drawn.

New angles and presentation output. Ask for the same house from above and the materials, the chimney and the field come with it. At 4K that frame comes straight from the model rather than an upscaler, which is the difference between slate that reads as slate and slate that reads as noise once it is printed at A1.

How do you use Flux 3 in Fenestra?

1. Open a project and choose Create or Edit.
2. Pick Flux 3 from the model list.
3. For edits, describe the change and say what should stay. "Keep the windows and roofline" is doing real work in the prompts above.
4. Add up to nine reference images and refer to them by number in the prompt.
5. Set the resolution. 1K is fine for exploring, 2K for client review and 4K for the final board.

The Edit tool's Edit Area also works with Flux 3 if you would rather paint the region than describe it.

How much does Flux 3 cost in Fenestra?

Flux 3 is included on every plan and uses credits like the rest of the model list. Cost scales with resolution, so 1K explorations are cheap and 4K is the one to save for the view you are printing. You will see the credit cost in the generate button before you commit.

What is different from Flux 2 Pro?

Flux 2 Pro is still in Fenestra and still produces a beautiful cinematic single image. Flux 3 is the one to reach for when you are iterating on an existing view, when you have references to compose, or when the output needs to be 4K. If you have been using Flux 2 Pro for client-facing renders, run the same prompt through both and compare.

Try Flux 3

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