FLUX.2 Flex API

Configurable FLUX.2 model balancing quality, latency, and control.

Modalities
Image, TextImage
Price
$0.05per Megapixel
Model type
Image generation
Released
Jun 12, 2026

FLUX.2 Flex overview

Sample FLUX.2 Flex 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 Flex specs

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

Configurable FLUX.2 model balancing quality, latency, and control.

FLUX.2 Flex 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

Product mockups with precise text and brand assets are documented use cases for this model, along with marketing materials and typography-heavy creative work.

It is also documented as suited to campaigns that need consistent characters across images, product placement across different contexts, and brand-accurate color matching.

Another documented use case is text-intensive layouts and images that require text overlays or careful preservation of fine details.

It is further documented for creative workflows that need fine-grained control over generation parameters, including manual quality-speed tradeoffs.

FLUX.2 Flex benchmarks by Artificial Analysis

Human-preference results for FLUX.2 Flex 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 Flex ranks #29 of 98.

FLUX.2 Flex API pricing

FLUX.2 Flex pricing in US dollars
UsagePriceUnit
Image generation$0.05per 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 Flex 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 Flex$0.05
FLUX.2 Klein 4B$0.014
FLUX.2 Klein 9B$0.015
FLUX.2 Klein 9B Preview$0.015
FLUX.2 Pro Preview$0.03

How to use the FLUX.2 Flex 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-flex",
  "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

All posts

FLUX.2 Flex FAQ

What inputs and outputs does FLUX.2 Flex support?

FLUX.2 Flex takes image, text as input and returns image.

When was FLUX.2 Flex released?

FLUX.2 Flex became available on June 12, 2026.

How much does FLUX.2 Flex cost?

FLUX.2 Flex costs $0.05 per Megapixel on AI/ML API, billed as you go with no subscription.

How is FLUX.2 Flex billed?

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

Can FLUX.2 Flex take an existing image as input?

Yes, FLUX.2 Flex accepts image input as well as a text prompt.

Who created FLUX.2 Flex?

FLUX.2 Flex was built by Black Forest Labs.

How do I call FLUX.2 Flex on AI/ML API?

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

Is FLUX.2 Flex available through a single API key?

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

Is FLUX.2 Flex a multimodal language model?

No. It is an image generation model that turns text or text-plus-image prompts into images.

What is FLUX.2 Flex best suited for?

It is a configurable version of FLUX.2 designed to balance image quality, generation speed, and user control.

Start building with FLUX.2 Flex

FLUX.2 Flex API

blackforestlabs/flux-2-flex

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-flex",
  "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."
}'