Black Forest Labs
FLUX.1 Krea [dev]
FLUX.1 [dev] tuned by Krea for natural, less AI-looking images. On Leap, it sits beside 130 other models in one studio.
- Text to image
- 5 aspect ratios
- Start free, no card
- Every top model, one account
- Pay per run, priced before it starts
- 01Describe what you want to see
- 02See the exact price, then press go
- 03Keep it in your library, or take it further
Start with an idea
Three ways to try FLUX.1 Krea [dev]
Side by side
More image models on Leap
Questions
FLUX.1 Krea [dev] on Leap, answered.
- Is this the real FLUX.1 Krea [dev]?
- Yes. Leap sends your request to Black Forest Labs's model through its provider and gives you back what it makes. Switch to any other model in the same studio when an idea needs it.
- What does it cost?
- In dollars, per run: the provider's list price plus 10%. You see the exact price before every run, a run that fails costs nothing, and there is no subscription. Every model's price is on the pricing page.
- Do I need a Black Forest Labs account?
- No. One Leap account and one balance run FLUX.1 Krea [dev] and every other model, in the studio, through the API and from your agents.
- What happens to what I make?
- It stays in your library while your account is active, ready to use anywhere.
Your idea, FLUX.1 Krea [dev].
Start free, no card. Every run shows its price before it starts.
Make it with FLUX.1 Krea [dev]For developers
Run FLUX.1 Krea [dev] from code
- Model ID
- black-forest-labs/flux-krea-dev
- Makes
- Image
- Pricing
- Per run, quoted first: POST /v1/quotes
Inputs
What the model takes. Leave out anything with a default.
Promptprompt
Text, up to 4,000 characters, required
Aspect ratioaspect_ratio
1:1, 3:4, 9:16, 4:3, 16:9. Default: 4:3
Imagesn
1 to 4. Default: 1
Num Inference Stepssettings.num_inference_steps
1 to 50. Default: 28The number of inference steps to perform.
Guidance scale (CFG)settings.guidance_scale
1 to 20. Default: 4.5The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt when looking for a related image to show you.
Accelerationsettings.acceleration
None, Regular, High. Default: NoneThe speed of the generation.
Seedseed
0 to 4294967295The same seed and input give the same image.
The request
The same envelope for every model; only the model and its input change. With prefer: wait=60 the answer holds the result. Agents can call it through the MCP server at mcp.tryleap.ai.
curl https://api.tryleap.ai/v1/generations \ -H "x-api-key: $LEAP_API_KEY" \ -H "content-type: application/json" \ -H "prefer: wait=60" \ -d '{ "model": "black-forest-labs/flux-krea-dev", "input": { "prompt": "A paper boat drifting down a rainy street at dusk" } }'