We’ve recently added support for Flux 2 Klein alongside Flux 2 Pro in Fenestra. Both models are very capable, but they suit different stages of a design workflow.

Flux 2 Klein Built for speed and cost efficiency.

In many cases it generates images in under a second. It understands prompts well, keeps geometry intact, and is ideal for quick iteration. This makes it a good fit for early exploration and testing multiple directions without burning credits.

Flux 2 Pro Slower, but produces more cinematic results.

It excels at lighting, material depth, and overall atmosphere. Prompt adherence is strong, and the outputs feel more polished, making it better suited for presentations or moments where visual quality matters most.

Flux 2 Pro

Flux 2 Klein

Both models are incredibly capable, I recommend using both. If you want more cinematic renderings Flux 2 Pro provides the best results but Flux 2 Klein holds up well for speed, style and credit use.

Update, October 2026: Black Forest Labs has since released Flux 3, which edits locally, takes up to ten references and outputs native 4K. If you are iterating on an existing view rather than generating a fresh one, see Flux 3 for architecture and interior design.

Try it yourself in Fenestra.

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