Flux 2 Klein 9b

Name: Flux 2 Klein 9b
Author: BFL

bfl/flux-2/klein/9b/edit

Flux 2 Klein 9b 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 agent Get API key

Base price: $0.01USD / run
Execution: async
Model type: image
Input fields: 6

Try the model

Playground

Open playground

Input

Prompt(string)

The prompt to edit the image.

Image URL or upload(array)

Upload

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

The URLs of the images for editing. A maximum of 4 images are allowed.

Number of Inference Steps(integer)

The number of inference steps to perform. Range: 4 to 8.

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 seed to use for the generation. If not provided, a random seed will be used.

OutputReady

Your output will appear here

Complete the inputs, then click Run.

Specifications

Pricing

Base price: $0.01 / 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/klein/9b/edit
Execution: async
API: Unified Run API
Endpoint: /v1/run

API README

Flux 2 Klein 9b

Flux 2 Klein 9B Edit changes and enhances existing photos through natural-language instructions. It keeps the supplied visual at the center of the process, allowing a written brief to revise an asset rather than replace it with an unrelated composition.

The model uses a focused 4–8 inference-step range for concise iteration. It also accepts optional image inputs, supports ten aspect ratios, exports JPEG or PNG, and provides a seed for repeatable comparisons.

Highlights

Natural-language editing. Describe the requested photo change in familiar creative language and refine the instruction between attempts.

Existing-image enhancement. Improve a supplied visual while retaining the asset that establishes its subject and composition.

Focused iteration range. Work within 4–8 inference steps when a project benefits from short review cycles.

Placement-ready output. Choose among ten aspect ratios, export JPEG or PNG, and retain a seed for reproducible variations.

Pricing

Billing unit	Price
Per request	$0.015

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": "png",
  "prompt": "Turn this into a realistic image"
}

Technical Specs

Spec	Value
Model ID	`bfl/flux-2/klein/9b/edit`
Inputs	aspect_ratio, images, num_inference_steps, 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/klein/9b/edit/lora — Compare this concrete local family route.
bfl/flux-2/klein/9b — Compare this concrete local family route.
bfl/flux-2/klein/9b/base — 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-2/klein/9b/edit

# 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 $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "bfl/flux-2/klein/9b/edit",
  "images": [
    "https://static.sandbase.ai/examples/bfl/flux-2/klein/9b/edit/input_images_0.png"
  ],
  "prompt": "Turn this into a realistic image",
  "output_format": "png",
  "num_inference_steps": 4
}
SANDBASE_JSON
)
run_id=$(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 language models

Model	Context	Input / 1M	Output / 1M	Released
Flux 2 Klein 9bThis model `BFL`	—	—	—	Jan 15, 2026
FLUX Virtual Try-On `BFL`	—	—	—	May 28, 2026
Flux Pro Erase `BFL`	—	—	—	May 21, 2026
Flux 2 Pro `BFL`	—	—	—	May 14, 2026
FLUX.2 [klein] 9B LoRA `BFL`	—	—	—	Mar 17, 2026
FLUX.2 [klein] 9B LoRA `BFL`	—	—	—	Mar 17, 2026