Flux 1 Kontext Max

bfl/flux-1/kontext-max

Flux 1 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.

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Base price: $0.08USD / run
Execution: async
Model type: image
Input fields: 6

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Playground

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Input

Prompt(string)

The prompt to generate an image from.

Image URL(string)

Upload

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

Image prompt for the omni model.

This field is required.

Guidance scale (CFG)(number)

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.

Output Format(string)

The format of the generated image. Allowed values: jpeg, png.

Aspect Ratio(string)

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.

Seed(integer)

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.

Model card

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-1/kontext-max
Execution: async
Base URL: https://api.sandbase.ai
API: Unified Run API
Endpoint: /v1/run

API README

Flux 1 Kontext Max

Flux 1 Kontext Max is the premium Kontext model for maximum prompt adherence, editing consistency, and visual finish. It retains the family’s unified creation and editing behavior while prioritizing difficult transformations, typography, character continuity, and polished output when quality matters more than the Pro tier’s lower cost.

Choose Max for final campaign assets, complex multi-step revisions, text-heavy designs, and character work where small continuity failures are unacceptable. Give exact replacement wording, preservation instructions, desired styling, and compositional hierarchy, then keep later edits scoped to avoid drifting from the approved identity.

Highlights

Premium editing consistency. Maintains stronger continuity across difficult and successive image revisions.
Maximum prompt adherence. Follows complex creative and preservation instructions with greater precision.
High-end typography handling. Edits or creates designed text while respecting layout and visual context.
Character and style fidelity. Keeps recurring subjects and aesthetic direction stable across transformations.

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 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-max`
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.

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-1/kontext-max

# 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 $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "bfl/flux-1/kontext-max",
  "image": "https://static.sandbase.ai/examples/bfl/flux-1/kontext-max/output_url_0.png",
  "prompt": "Put a donut next to the flour.",
  "output_format": "jpeg",
  "guidance_scale": 3.5
}
SANDBASE_JSON
)
run_id=$(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"

Choose your model

Compare models

All image & video models

Model	Type	Default price	Released
Flux 1 Kontext MaxThis model `BFL`	Image	$0.08 / run	May 29, 2025
Flux 3 Text to Image `BFL`	Image	$0.05 / run	Oct 1, 2026
Flux 3 Edit `BFL`	Image	$0.05 / run	Oct 1, 2026
Flux 2 Klein 4B Edit `BFL`	Image	$0.02 / run	Jan 15, 2026
Flux 2 Klein 9B Edit `BFL`	Image	$0.02 / run	Jan 15, 2026
Flux 2 Klein 9B Text to Image `BFL`	Image	$0.01 / run	Jan 15, 2026

Questions

FAQ

How do I call BFL Flux 1 Kontext Max through SandBase?

Create a SandBase API key, then send requests with the model ID "bfl/flux-1/kontext-max" to Unified Run API (/v1/run) at https://api.sandbase.ai. The request examples on this page show the exact payload.

Do I need a separate BFL account?

No. One SandBase API key and balance gives you access to BFL Flux 1 Kontext Max and the other models in the catalog; you do not need to sign up with BFL separately.