FLUX.1 [dev]

bfl/flux-1/dev/image-to-image

Flux 1 Dev is BFL's intelligent image editing model. Transform, retouch, and reimagine existing images using text prompts - from background replacement to artistic style conversion.

Use in agent Get API key

Base price: $0.03USD / run
Execution: async
Model type: image
Input fields: 7

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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

The URL of the image to generate an image from.

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.

Num Inference Steps(integer)

1050

The number of inference steps to perform. Range: 10 to 50.

Strength(number)

0.011

The strength of the initial image. Higher strength values are better for this model. Range: 0.01 to 1.

Output Format(string)

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

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: $0.03 / 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/dev/image-to-image
Execution: async
Base URL: https://api.sandbase.ai
API: Unified Run API
Endpoint: /v1/run

API README

FLUX.1 [dev]

FLUX.1 [dev] reinterprets a supplied image through the adaptable FLUX.1 Dev foundation, using the source as a compositional and visual condition while permitting broader transformation than a narrowly localized edit. It can explore new styles, environments, palettes, and rendering approaches around recognizable source cues.

Choose it for research-driven style transfer, concept variation, visual domain conversion, and source-conditioned generation. Describe which high-level features should survive—such as subject, layout, silhouette, or palette—and which aspects are free to change, then tune the creative strength outside the prose brief.

Highlights

Source-conditioned regeneration. Builds a new visual from the composition and content of an input image.
Broad style transformation. Moves the source into different photographic, illustrative, or graphic treatments.
Adjustable source influence. Balances reference fidelity against creative reinterpretation in the generated result.
Adaptable development workflow. Supports local experiments and customized image-to-image pipelines.

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 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.

{
  "image": "https://example.com/start-frame.png",
  "output_format": "jpeg",
  "prompt": "A cat dressed as a wizard with a background of a mystic forest."
}

Technical Specs

Spec	Value
Model ID	`bfl/flux-1/dev/image-to-image`
Inputs	guidance_scale, image, num_inference_steps, output_format, prompt, seed, strength
Required inputs	prompt, image
Output fields	content_type, url
Execution	Async (submit, then poll for result)
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/redux — 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/dev/image-to-image

# 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 $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "bfl/flux-1/dev/image-to-image",
  "image": "https://static.sandbase.ai/examples/bfl/flux-1/dev/image-to-image/input_image_0.png",
  "prompt": "A cat dressed as a wizard with a background of a mystic forest.",
  "strength": 0.95,
  "output_format": "jpeg",
  "guidance_scale": 3.5,
  "num_inference_steps": 40
}
SANDBASE_JSON
)
run_id=$(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 [dev]This model `BFL`	Image	$0.03 / run	Jun 2, 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 [dev] through SandBase?

Create a SandBase API key, then send requests with the model ID "bfl/flux-1/dev/image-to-image" 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 [dev] and the other models in the catalog; you do not need to sign up with BFL separately.