bfl/flux-1/krea
Flux 1 Krea is BFL's advanced text-to-image AI model. Create photorealistic images, illustrations, and concept art from natural language descriptions with exceptional detail and prompt adherence.
Example output — click Run to generate your own
Send your first request
OpenAI-compatible endpoint with unified authentication and usage tracking.
https://api.sandbase.ai/v1/runbfl/flux-1/kreaInput Schema
6 parameters · 1 required · 5 optional
| Parameter | Type | Required | Description |
|---|---|---|---|
prompt | string | Required | The prompt to generate an image from. |
seed | integer | Optional | The same seed and the same prompt given to the same version of the model will output the same image every time. |
aspect_ratio | string | Optional | The aspect ratio of the generated image. · Options: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16 21:916:93:24:35:41:14:53:42:39:16 |
output_format | string | Optional | The format of the generated image. · Options: jpeg, png · Default: "jpeg" jpegpng |
guidance_scale | number | Optional | The 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. · Min: 1 · Max: 20 · Default: 4.5 |
num_inference_steps | integer | Optional | The number of inference steps to perform. · Min: 1 · Max: 50 · Default: 28 |
Output Schema
| Field | Type | Description |
|---|---|---|
id | string | Unique identifier for the generation task |
status | string | Task status: pending, running, completed, failed, timeout |
model | string | Model used for the generation |
outputs | array | Array of output items |
outputs[].url | string | URL of the generated artifact |
outputs[].content_type | string | MIME type (e.g. image/png, video/mp4) |
error | object | null | Error details if failed, null on success |
error.type | string | Machine-readable error type code |
error.message | string | Human-readable error description |
Async Workflow
This model uses asynchronous execution. Submit a request and poll for the result.
- Submit — POST to /v1/run, receive an
id - Poll — GET /v1/run/{id} until status is
completed,failed, ortimeout - Retrieve — Read
outputsfrom the completed response
Code Examples
Ready-to-run snippets
# Step 1: Submit
curl -X POST https://api.sandbase.ai/v1/run \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "bfl/flux-1/krea",
"prompt": "A candid street photo of a woman with a pink bob and bold eyeliner on a graffiti-covered subway platform. She wears a bright yellow patent leather coat over a black-and-white checkered turtleneck and platform boots. Natural subway lighting creates an authentic urban scene with a relaxed, unposed feel.",
"output_format": "jpeg",
"guidance_scale": 4.5,
"num_inference_steps": 28
}'
# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
-H "Authorization: Bearer YOUR_API_KEY"API README
FLUX.1 Krea [dev]
FLUX.1 Krea [dev] is a FLUX.1 image model tuned toward a distinctive polished aesthetic, favoring compelling composition and visual finish for prompt-led creation. It supports photographic and stylized work where creators want a strong art-directed look rather than the more neutral behavior of a general foundation model.
Use it for fashion, lifestyle, editorial, concept art, and campaign ideation where aesthetic character is central. Describe the subject and action first, then camera, composition, lighting, palette, texture, and mood; the Krea treatment should reinforce a clear brief rather than compensate for an undefined scene.
Highlights
- Krea-tuned visual aesthetics. Favors polished, art-directed imagery with a distinctive creative finish.
- Strong compositional taste. Builds readable hierarchy, framing, color relationships, and atmosphere.
- Photographic and stylized range. Moves between realistic editorial imagery and expressive visual treatments.
- Prompt-led art direction. Connects subject, lighting, texture, and mood to the requested aesthetic.
Pricing
| Billing unit | Price |
|---|---|
| Per request | $0.025 |
When to Use
| ✅ Good fit | ❌ Consider alternatives |
|---|---|
| The model's named workflow matches the source material and intended output | A different input modality or model route is required |
| A managed asynchronous result is suitable for the production pipeline | A synchronous, interactive editor is essential |
| The documented controls cover the required duration, framing, or format | The project needs controls outside this endpoint's schema |
| Creative iteration benefits from a repeatable request structure | Exact deterministic pixels, frames, geometry, or samples are mandatory |
| A finished downloadable media asset is the desired deliverable | Editable source layers or a native project file are required |
Prompt Guide
For generation, state the intended result first, then add the subject or source treatment, progression, style, and delivery constraints. Keep one creative variable per phrase, use the documented field names for controls, and change one setting at a time when comparing results.
{
"aspect_ratio": "21:9",
"output_format": "jpeg",
"prompt": "A candid street photo of a woman with a pink bob and bold eyeliner on a graffiti-covered subway platform. She wears a bright yellow patent leather coat over a black-and-white checkered turtleneck and platform boots. Natural subway lighting creates an authentic urban scene with a relaxed, unposed feel."
}
Technical Specs
| Spec | Value |
|---|---|
| Model ID | bfl/flux-1/krea |
| Inputs | aspect_ratio, guidance_scale, num_inference_steps, output_format, prompt, seed |
| Required inputs | prompt |
| Output fields | content_type, url |
| Execution | Async (submit, then poll for result) |
| Aspect Ratio | 21:9 / 16:9 / 3:2 / 4:3 / 5:4 / 1:1 / 4:5 / 3:4 / 2:3 / 9:16 |
| Output Format | jpeg / png |
Related Models
bfl/flux-1/krea/image-to-image— Compare this concrete local family route.bfl/flux-1/krea/redux— Compare this concrete local family route.bfl/flux-1/dev— Compare this concrete local family route.