bfl/flux-2/pro
Flux 2 Pro 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/proInput Schema
4 parameters · 1 required · 3 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. |
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: "jpeg" jpegpng |
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/pro",
"prompt": "An intense close-up of knight's visor reflecting battle, sword raised, flames in background, chiaroscuro helmet shadows, hyper-detailed armor, square medieval, cinematic lighting",
"aspect_ratio": "16:9",
"output_format": "jpeg"
}'
# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
-H "Authorization: Bearer YOUR_API_KEY"API README
FLUX.2 Pro
bfl/flux-2/pro converts a written brief into a generated image. The brief can be expressed as natural language or organized as structured JSON inside the prompt. Structured prompting can separate the scene, subjects, style, lighting, mood, composition, and camera direction.
Simple natural-language prompts and structured prompt strings use the same request field. The endpoint returns the generated image through an output URL. The local request contract does not expose an image-input field.
Highlights
Production-optimized generation. Designed for dependable image creation in operational pipelines.
Studio-grade output. Delivers professional visual quality out of the box.
Zero-configuration quality. Internal optimization handles quality decisions without inference-step or guidance tuning.
Consistency and speed. Prioritizes predictable results and fast iteration across repeated generations.
Pricing
| Billing unit | Price |
|---|---|
| Per request | $0.03 |
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": "16:9",
"output_format": "jpeg",
"prompt": "An intense close-up of knight's visor reflecting battle, sword raised, flames in background, chiaroscuro helmet shadows, hyper-detailed armor, square medieval, cinematic lighting"
}
Technical Specs
| Spec | Value |
|---|---|
| Model ID | bfl/flux-2/pro |
| Inputs | aspect_ratio, 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-2/pro/edit— Compare this concrete local family route.bfl/flux-2/dev— Compare this concrete local family route.bfl/flux-2/dev/edit— Compare this concrete local family route.