bfl/flux-1/kontext
Flux 1 Kontext 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
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/kontextInput Schema
6 parameters · 2 required · 4 optional
| Parameter | Type | Required | Description |
|---|---|---|---|
image | string | Required | Image prompt for the omni model. · Min length: 1 |
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: 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-1/kontext",
"image": "https://static.sandbase.ai/examples/bfl/flux-1/kontext/output_url_0.png",
"prompt": "Put a donut next to the flour.",
"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
Flux 1 Kontext combines text-to-image generation with context-aware editing in one production model. It can create new imagery, revise objects and backgrounds, preserve recurring characters through multiple edits, replace text in designed assets, and transform visual style using straightforward natural-language instructions.
Use it for iterative creative workflows where the same image evolves through several directed steps. Quote exact wording when changing signs or labels, name the character or object that must remain consistent, and keep each edit focused so identity, layout, and visual context survive successive revisions.
Highlights
- Character consistency across edits. Maintains recognizable identity through repeated scene and appearance changes.
- Direct text replacement. Revises words in signs, posters, and labels while retaining surrounding styling.
- Context-aware object editing. Changes selected content without needlessly rebuilding unrelated regions.
- Unified creation and revision. Supports both new image generation and source-led transformation.
Pricing
| Billing unit | Price |
|---|---|
| Per request | $0.04 |
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 image-conditioned 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",
"image": "https://example.com/start-frame.png",
"output_format": "jpeg",
"prompt": "Put a donut next to the flour."
}
Technical Specs
| Spec | Value |
|---|---|
| Model ID | bfl/flux-1/kontext |
| Inputs | aspect_ratio, guidance_scale, image, output_format, prompt, seed |
| Required inputs | prompt, image |
| 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/dev— Compare this concrete local family route.bfl/flux-1/dev/edit— Compare this concrete local family route.bfl/flux-1/dev/image-to-image— Compare this concrete local family route.