FLUX.2 Klein 9B API

Compact 9B FLUX.2 model for efficient image generation.

Modalities
Image, TextImage
Price
$0.015per Megapixel
Model type
Image generation
Released
Jun 12, 2026

FLUX.2 Klein 9B overview

Sample FLUX.2 Klein 9B image generated through AI/ML API: A ginger cat asleep on a stack of exactly three hardcover books in a rainy bookshop window at dusk. Gold lette

FLUX.2 Klein 9B specs

Model ID
blackforestlabs/flux-2-klein-9b
Developer
Black Forest Labs
Input
Image, Text
Output
Image
Endpoint
POST https://api.aimlapi.com/v1/images/generations

Compact 9B FLUX.2 model for efficient image generation.

FLUX.2 Klein 9B API Pricing
- Pricing on request

High-volume image generation
Produce product visuals, thumbnails, and marketing assets programmatically at scale.

Creative and concept art
Turn text prompts into illustrations, mockups, and design explorations.

Use cases

Real-time image generation is a documented use case for FLUX.2 Klein 9B, which is described as built for applications requiring real-time image generation without sacrificing quality.

Text-to-image generation is another documented use case for this model; the model card says it can generate images from text descriptions.

Image editing with multiple references is also documented; the model supports multi-reference editing capabilities and is described as suitable for single-reference and multi-reference editing workflows.

Interactive visual workflows are a documented fit as well, with the model described as the flagship small model for the quality-versus-latency frontier and recommended for real-time, interactive applications.

FLUX.2 Klein 9B benchmarks by Artificial Analysis

Human-preference results for FLUX.2 Klein 9B in text to image, next to models available on AI/ML API. Data retrieved Nov 3, 2026.

Text to image

Elo · text-to-image arena

AI/ML API price

USD per Megapixel

Models on AI/ML API

Arena results for models you can call with the same API key.

Text to image

Blind pairwise human votes on images generated from text prompts. FLUX.2 Klein 9B ranks #68 of 98.

FLUX.2 Klein 9B API pricing

FLUX.2 Klein 9B pricing in US dollars
UsagePriceUnit
Image generation$0.015per Megapixel

The final price depends on request parameters such as resolution or duration.

Prices from the AI/ML API price list, checked on Nov 4, 2026.

FLUX.2 Klein 9B vs other image models: prices

AI/ML API rates for 5 models, per Megapixel.

AI/ML API prices in USD per Megapixel
ModelPer Megapixel
FLUX.2 Klein 9B$0.015
FLUX.2 Klein 4B$0.014
FLUX.2 Klein 9B Preview$0.015
FLUX.2 Pro Preview$0.03
FLUX.2 Flex$0.05

How to use the FLUX.2 Klein 9B API

View docs

Build with your agent

Give your agent the model details, code and documentation.

1Get your API key

Create API key
export AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"

2Make your first request

curl 'https://api.aimlapi.com/v1/images/generations' \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "blackforestlabs/flux-2-klein-9b",
  "prompt": "A ginger cat asleep on a stack of exactly three hardcover books in a rainy bookshop window at dusk. Gold lettering on the glass reads OPEN LATE. Warm lamp light inside, raindrops and blurred neon reflections outside, 35mm film photo."
}'

Related articles

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FLUX.2 Klein 9B FAQ

What inputs and outputs does FLUX.2 Klein 9B support?

FLUX.2 Klein 9B takes image, text as input and returns image.

When was FLUX.2 Klein 9B released?

FLUX.2 Klein 9B became available on June 12, 2026.

How much does FLUX.2 Klein 9B cost?

FLUX.2 Klein 9B costs $0.015 per Megapixel on AI/ML API, billed as you go with no subscription.

How is FLUX.2 Klein 9B billed?

FLUX.2 Klein 9B is billed per generation, a fixed charge per output rather than by prompt length.

Can FLUX.2 Klein 9B take an existing image as input?

Yes, FLUX.2 Klein 9B accepts image input as well as a text prompt.

Who created FLUX.2 Klein 9B?

FLUX.2 Klein 9B was built by Black Forest Labs.

How do I call FLUX.2 Klein 9B on AI/ML API?

Send a request to https://api.aimlapi.com/v1/images/generations with blackforestlabs/flux-2-klein-9b as the model id.

Is FLUX.2 Klein 9B available through a single API key?

Yes. FLUX.2 Klein 9B is served through AI/ML API, so the same key and endpoint format used for other models applies.

What is FLUX.2 Klein 9B designed for?

It is a compact 9-billion-parameter FLUX.2 model built for efficient image generation.

What is the FLUX.2 Klein 9B model ID?

Use blackforestlabs/flux-2-klein-9b as the model parameter. Requests go to https://api.aimlapi.com/v1/images/generations with your AI/ML API key.

Start building with FLUX.2 Klein 9B

FLUX.2 Klein 9B API

blackforestlabs/flux-2-klein-9b

Build with your agent

Give your agent the model details, code and documentation.

1Get your API key

Create API key
export AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"

2Make your first request

curl 'https://api.aimlapi.com/v1/images/generations' \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "blackforestlabs/flux-2-klein-9b",
  "prompt": "A ginger cat asleep on a stack of exactly three hardcover books in a rainy bookshop window at dusk. Gold lettering on the glass reads OPEN LATE. Warm lamp light inside, raindrops and blurred neon reflections outside, 35mm film photo."
}'