Flex
2 modes on this page
Flex turns a text prompt into an image. Pick a mode, write the prompt, run it in the studio.
Input
FormMode
Prompt*
Image Size
Result
Preview
Generated with Flex
$0.05 per megapixel·~10s
What Flex is for
Flex from Black Forest Labs is a text-to-image model. You describe the frame and it returns a still image in about 10 seconds, billed at $0.05 per megapixel. This page groups 2 modes (Image Editing and Text to Image) so you are not hunting separate URLs for the same family.
Flex is billed in Knowlify credits at the compute cost ($0.05 per megapixel). A typical run is about 10 seconds. Published rate: Your request will cost $0.05 per megapixel on both input and output side, rounded up to the nearest megapixel. For example, a 1024x1024 image will cost $0.05, and a 1920x1080 image will cost $0.10 ($0.06 × 2 megapixels). Similarly, a 512x512 output will cost $0.05 ($0.05 for 0.26 megapixels, rounded to 1 megapixel).
Pick Flex for text to image at $0.05 per megapixel and ~10s. Compare it with Flux, Flux 1, Flux 2 Klein on the related cards below if you need a different look, speed, or input type.
How to use Flex
- 1. Write a still prompt for Flex. Be specific about subject, style, and lens.
- 2. Run it. The prompt opens in the Knowlify studio, where Flex generates.
- 3. Stay in the studio to turn a document or a longer prompt into a narrated video.
What you need
- A prompt that names the subject, style, and framing.
- Image Size (square_hd, square, portrait_4_3, portrait_16_9, and more).
Example prompt
a barber cutting hair in a steam-filled shop, hard window light, dark studio product, one hard key, glossy, no text, no watermark
Frequently asked questions
How do I run Flex?
Run Flex on Knowlify at /generate/flex. This page has 2 modes in one dropdown. Write the prompt on this page and it opens in the studio, where Flex generates a still image. The same studio also turns documents into full narrated videos.
Where can I use Flex online?
On Knowlify (Black Forest Labs's model, knowlify.com/generate/flex). You do not need a separate playground. Flex runs in the studio next to document-to-video.
Can I make a longer video with Flex?
Flex itself produces a still image. On Knowlify you can take that output, or skip it and upload a document, and generate a full narrated video with a script you can edit.
What do I need to run Flex?
A text prompt is enough. Flex generates the image from that description in the studio.
How long does Flex take?
Plan on about 10 seconds for a typical run, then whatever queue time the studio has. Video models sit at the high end of that range.
Does Flex have more than one mode?
Yes. This page has 2 modes: Image Editing and Text to Image. Switch them in the Mode dropdown instead of opening a new URL.
What does Flux 2 Flex cost?
Your request will cost $0.05 per megapixel on both input and output side, rounded up to the nearest megapixel. For example, a 1024x1024 image will cost $0.05, and a 1920x1080 image will cost $0.10 ($0.06 × 2 megapixels). Similarly, a 512x512 output will cost $0.05 ($0.05 for 0.26 megapixels, rounded to 1 megapixel). Knowlify charges this as credits, at the compute cost.
What is Flux 2 Flex best for?
Text-to-image generation with FLUX.2 [flex] from Black Forest Labs. Features adjustable inference steps and guidance scale for fine-tuned control. Enhanced typography and text rendering capabilities. It turns a text prompt into an image.
Do I need an account to use Flux 2 Flex?
A free Knowlify account, yes. This page composes the prompt; the studio is where Flux 2 Flex actually runs.