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Black Forest Labs adds up to 5x faster fast mode to FLUX Outpainting

June 11, 2026 at 13:30 EDT

Media Generation
Foundation Models

Black Forest Labs has added a speed-focused "fast mode" to its FLUX Outpainting image-extension feature. According to the company, it is up to 5x faster and is built for iterating on designs before switching to the quality-oriented "high mode" for final output.

June 11 · Black Forest Labs

FLUX Outpainting Gets a "Fast Mode" — Up to 5× Quicker for Design Iteration

A new speed-first mode lets designers rapidly test composition when extending an image, then switch to the existing high mode for the final, quality-focused render.

5×

Up to faster vs. standard

4MP

Full output resolution

$0.01

Per credit (BFL API guideline)

Iteration speed: fast mode vs. standard

Relative time to render the same outpaint — taller column = slower

fast mode

1×

design iteration

high mode

5×

quality finishing

Same 4MP output ceiling for both modes — the trade-off is speed, not resolution.

The intended workflow

fast mode

Rapidly trial composition & framing during iteration

→

high mode

Switch once satisfied for the quality-focused final render

Outpainting extends any image in any direction — for aspect-ratio changes, social reformatting, and banners — preserving lighting, texture, and composition with few visible seams. Just pass an image plus a target canvas size and placement; no text prompt required in some cases.

Praised in real-world use

"Seamless and natural" extensions
Few visible seams or lighting breakdowns
High-quality results in ComfyUI vs. paid apps

Where it still struggles

Quality can degrade on large extensions
Dev version may need careful prompt strategy
Fast-mode benchmarks not yet accumulated

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