# Run FLUX.1 dev

The sharpest open image model. Slower, and much better at text in images. Ready in about 90 seconds on an L40S, from $0.89/hr. No install, no code.

## What it does

FLUX.1 dev makes images from text like Stable Diffusion does, but the results are noticeably cleaner. Hands, faces, and small details hold together where older models fall apart.

Its stand-out skill is readable text. If your image needs a sign, a label, or a headline inside it, this is the model that gets the letters right.

It is bigger and slower than Stable Diffusion XL, so it costs more per image. Use it for final work and use a faster model while you are still experimenting.

## Your setup

We run FLUX.1 dev on an L40S with 48GB of memory, at $0.89 per hour, billed by the minute. It takes about 18 seconds per image.

FLUX.1 dev is roughly three times the size of Stable Diffusion XL and needs about 24GB of memory at full precision. It will run on a 24GB RTX 4090 in a compressed form, but compression is where the fine detail and the readable text go. The L40S has enough headroom to run it uncompressed, which is the entire reason to pick this model.

## What it costs

200 images takes about 60 minutes of GPU time, which is about $0.89.

## Two ways to run it

- **Open the app.** A ComfyUI workspace with a FLUX graph already wired up. Type, generate, adjust.
- **Run a batch job.** Send a list of prompts and collect the finished images. The GPU stops itself when the last one is done.

## Model facts

| Field | Value |
|---|---|
| Parameters | 12B |
| License | FLUX.1 dev Non-Commercial License |
| Memory required | 24GB minimum, 48GB recommended |
| Base model | Trained from scratch by Black Forest Labs |
| Publisher | Black Forest Labs |
| Recommended hardware | L40S, 48GB |
| Category | [Image generation](https://gpuvault.io/working-on/image-generation/) |

## Questions people ask

### Can I use FLUX.1 dev images commercially?

Not under this version. FLUX.1 dev is released under a non-commercial license, so the images are fine for personal work, tests, and internal concepts but not for paid client work or products you sell. Black Forest Labs sells a separate commercial license, and FLUX.1 schnell is available under Apache 2.0 if you need commercial rights today. If your work is commercial, use Stable Diffusion XL instead.

### Do I need to install anything to use FLUX.1 dev?

No. We start a machine with FLUX.1 dev already loaded and hand you a link. Everything runs in your browser, there is nothing to download, and nothing is left on your computer afterwards. It works the same on a Mac, a Windows laptop, or a Chromebook. A workspace is usually ready in about 90 seconds.

### How much does it cost to run 200 images?

About $0.89. FLUX.1 dev takes about 18 seconds per image on the L40S we recommend, so 200 images is roughly 60 minutes of GPU time at $0.89 per hour. Billing is by the minute, and a batch job shuts the GPU off the moment the last item finishes. The calculator above works this out for your own numbers.

### Can I run FLUX.1 dev on a cheaper card?

Sometimes, and the calculator will not always make it look worth it. FLUX.1 dev is roughly three times the size of Stable Diffusion XL and needs about 24GB of memory at full precision. It will run on a 24GB RTX 4090 in a compressed form, but compression is where the fine detail and the readable text go. The L40S has enough headroom to run it uncompressed, which is the entire reason to pick this model. If you want to try a different card anyway, the advanced catalog lets you pick one and shows the estimated time before you commit.

### What are the license restrictions on FLUX.1 dev?

FLUX.1 dev is released under the FLUX.1 dev Non-Commercial License. That is not a permissive license, so read it before you use the output in paid work. We show the license on every model page precisely because this catches people out, and there is usually a permissively licensed alternative in the same category.

### What happens to my files after I stop?

Anything you save into your workspace folder stays in your account and is there when you come back. Everything else is destroyed: the machine is terminated and its disk is wiped. Batch job inputs and outputs are deleted from our storage 24 hours after you download them. We do not read your files or use them to train anything.

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*Source: https://gpuvault.io/model/flux-1-dev/ — GPUVault, GPU rental by the minute.*