bfl/flux-2/flash
Flux 2 Flash by BFL - generate stunning images from text prompts with state-of-the-art AI. Supports multiple aspect ratios, styles, and high-resolution output for creative and commercial use.
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-2/flashInput Schema
5 parameters · 1 required · 4 optional
| Parameter | Type | Required | Description |
|---|---|---|---|
prompt | string | Required | The prompt to generate an image from. |
seed | integer | Optional | The seed to use for the generation. If not provided, a random seed will be used. |
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 · Default: "16:9" 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: "png" jpegpng |
guidance_scale | number | Optional | 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: 0 · Max: 20 · Default: 2.5 |
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-2/flash",
"prompt": "An army of ants battles for a sugar cube in a giant sandbox, with tiny plastic soldier toys caught in the melee. Ant bodies shine against gritty beige sand and the glossy, crystalline cube. Fiery sunrise spills golden highlights, throwing dramatic shadows, amplifying the excitement. Shot macro (100mm), aperture f/2.8 for soft background, centered composition with ground-level POV, mixing organic and manufactured textures.",
"aspect_ratio": "16:9",
"output_format": "png",
"guidance_scale": 2.5
}'
# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
-H "Authorization: Bearer YOUR_API_KEY"API README
Flux 2 Flash
Flux 2 Flash is the speed-focused FLUX.2 Flash generation route, designed for quick visual response without reducing the task to a low-quality placeholder. It turns a scene brief into a polished image suitable for fast concept comparison and high-throughput production.
Use it when turnaround and iteration volume matter: live creative tools, A/B variants, social assets, thumbnails, or early campaign exploration. Lead with the subject and action, then add composition, lighting, materials, and style. Move to a quality-oriented tier only when final-detail demands exceed the Flash result.
Highlights
- Low-latency generation. Produces visual concepts quickly for interactive and high-throughput workflows.
- Prompt-faithful scene building. Coordinates subject, composition, lighting, materials, and style despite the speed focus.
- Polished rapid previews. Creates useful design and photographic candidates rather than simple rough placeholders.
- Scalable creative iteration. Makes broad A/B exploration and many-variant production practical.
Pricing
| Output size | Billing unit | Price |
|---|---|---|
| First started megapixel | Per request | $0.005 |
| Each additional started megapixel | Per megapixel | $0.005 |
When to Use
| ✅ Good fit | ❌ Consider alternatives |
|---|---|
| The project needs this exact generation or editing route | The intended task belongs to video, audio, or 3D media |
| Available references match every required local field | Required source assets or rights are unavailable |
| The brief can specify composition, color, and finish | Output must be deterministic at pixel level |
| Supported dimensions and formats fit final placement | Delivery requires unsupported canvas specifications |
| An asynchronous generated image fits production | A live frame-synchronous response is mandatory |
Prompt Guide
Write a complete visual brief: identify the subject and references, define composition and viewpoint, describe lighting, palette, materials, typography, and finish, then list exact preservation constraints. FLUX.2 Klein does not rely on prompt upsampling, so use clear descriptive sentences rather than sparse keywords.
{
"prompt": "A photorealistic editorial composition with precise subject placement, controlled lighting, exact colors, and clean typography",
"seed": 1,
"aspect_ratio": "21:9",
"output_format": "jpeg"
}
Technical Specs
| Spec | Value |
|---|---|
| Model ID | bfl/flux-2/flash |
| Input fields | seed (integer)<br>prompt (string)<br>aspect_ratio (string; 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16)<br>output_format (string; jpeg, png)<br>guidance_scale (number; 0–20) |
| Required input | prompt |
| Output fields | url, content_type |
| Execution | Asynchronous job |
Related Models
bfl/flux-2-lora-gallery/apartment-stagingbfl/flux-2-lora-gallery/face-to-full-portraitbfl/flux-2-lora-gallery/multiple-angles