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FLUX.1 Kontext [max]

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.

Use in agentGet API key
Base price
$0.08USD / run
Execution
async
Model type
image
Input fields
6

Try the model

Playground

Open playground
Input
The prompt to generate an image from.

PNG, JPEG, WebP, or GIF · 20 MiB maximum each

Image prompt for the omni model.
120
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. Range: 1 to 20.
The format of the generated image. Allowed values: jpeg, png.
The aspect ratio of the generated image. Allowed values: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16.
The same seed and the same prompt given to the same version of the model will output the same image every time.
OutputReady

Your output will appear here

Complete the inputs, then click Run.

Specifications

Pricing

Base price
$0.08 / run

Context & modalities

Input
Schema-defined
Output
image

Capabilities

Chat
Not supported
Vision
Not supported
Reasoning
Not supported
Structured output
Not supported
Function calling
Not supported
Audio input
Not supported

Access

Provider
BFL
Model ID
bfl/flux-2/kontext/max/multi
Execution
async
API
Unified Run API
Endpoint
/v1/run

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 unitPrice
Per request$0.08

When to Use

✅ Good fit❌ Consider alternatives
The model's named workflow matches the source material and intended outputA different input modality or model route is required
A managed asynchronous result is suitable for the production pipelineA synchronous, interactive editor is essential
The documented controls cover the required duration, framing, or formatThe project needs controls outside this endpoint's schema
Creative iteration benefits from a repeatable request structureExact deterministic pixels, frames, geometry, or samples are mandatory
A finished downloadable media asset is the desired deliverableEditable 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

SpecValue
Model IDbfl/flux-2/kontext/max/multi
Inputsaspect_ratio, guidance_scale, images, output_format, prompt, seed
Required inputsprompt
Output fieldscontent_type, url
ExecutionAsync (submit, then poll for result)
Aspect Ratio21:9 / 16:9 / 3:2 / 4:3 / 5:4 / 1:1 / 4:5 / 3:4 / 2:3 / 9:16
Output Formatjpeg / png

Related Models

Start building

Send your first request

OpenAI-compatible endpoint with unified authentication and usage tracking.

Production API
Unified Run API endpoint
https://api.sandbase.ai/v1/run
Model ID
bfl/flux-2/kontext/max/multi
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
  -X POST "https://api.sandbase.ai/v1/run" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "bfl/flux-2/kontext/max/multi",
  "images": [
    "https://static.sandbase.ai/examples/bfl/flux-2/kontext/max/multi/input_images_0.webp",
    "https://static.sandbase.ai/examples/bfl/flux-2/kontext/max/multi/input_images_1.webp"
  ],
  "prompt": "Put the little duckling on top of the woman's t-shirt.",
  "output_format": "jpeg",
  "guidance_scale": 3.5
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
  status=$(printf '%s' "$result" | jq -r .status)
  case "$status" in completed|failed|timeout) break ;; esac
  sleep 2
  result=$(curl --fail-with-body --silent \
    -H "Authorization: Bearer $SANDBASE_API_KEY" \
    "https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"

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