bfl/flux-2/kontext/max/multi
Flux 2 Kontext Max by BFL - AI-powered image editing, style transfer, and transformation. Edit photos with natural language instructions, remove backgrounds, change styles, and enhance images effortlessly.
PNG, JPEG, WebP, or GIF · 20 MiB maximum each
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/kontext/max/multiInput 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. |
images | string[] | Optional | Image prompt for the omni model. |
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: 3.5 |
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/kontext/max/multi",
"images": [
"https://static.sandbase.ai/examples/bfl/flux-2/kontext/max/multi/input_images_0.webp",
"https://static.sandbase.ai/examples/bfl/flux-2/kontext/max/multi/input_images_1.webp"
],
"prompt": "Put the little duckling on top of the woman's t-shirt.",
"output_format": "jpeg",
"guidance_scale": 3.5
}'
# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
-H "Authorization: Bearer YOUR_API_KEY"API README
FLUX.1 Kontext [max]
FLUX.1 Kontext [max] Multi applies natural-language changes to existing photos and can enhance supplied imagery. Multiple image inputs let a request carry several visual references into the same edit instead of relying on the prompt alone.
The model supports guidance from 1 to 20, ten aspect ratios, JPEG or PNG output, and seed control. This combination suits image-editing work that needs reference-rich direction and predictable delivery settings.
Highlights
Multiple image references. Supply several images when subject, composition, or treatment cues come from different assets.
Natural-language changes. Express the requested photo revision in a prompt that can be adjusted as the edit develops.
Image enhancement. Improve existing imagery while preserving its relationship to the supplied visual material.
Controlled delivery. Choose guidance from 1–20, one of ten aspect ratios, JPEG or PNG, and a seed for repeatable output.
Pricing
| Billing unit | Price |
|---|---|
| Per request | $0.08 |
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",
"images": [
"https://example.com/reference-1.png",
"https://example.com/reference-2.png"
],
"output_format": "jpeg",
"prompt": "Put the little duckling on top of the woman's t-shirt."
}
Technical Specs
| Spec | Value |
|---|---|
| Model ID | bfl/flux-2/kontext/max/multi |
| Inputs | aspect_ratio, guidance_scale, images, 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/kontext/max/text-to-image— Compare this concrete local family route.bfl/flux-2/kontext/dev— Compare this concrete local family route.bfl/flux-2/kontext/pro/multi— Compare this concrete local family route.