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Flux.2 API

Text to Image

Black Forest Labs image model. Supports 3 modes: Flex, Pro, and Max with reference images.

Click or drag & dropPNG, JPG, WEBP, GIF · Max 100MB
Output

Your generated image will appear here

Features

What Flux.2 API offers

Three variants: Flex (extra controls), Pro (balanced), and Max (adds 5:4 and 21:9 aspect ratios in the playground)
Output quality presets: 1K or 2K
Flex mode exposes steps (1 to 50) and CFG (1.5 to 10) for fine control
Shared text prompt plus up to 10 reference images to steer content or style
Wide aspect ratio options including auto, 1:1 through 9:16, plus Max-only 5:4 and 21:9
Separate generate and poll endpoints per variant (flex, pro, max routes)
Metered pricing per Black Forest Labs model name (flux.2-flex, flux.2-pro, flux.2-max)

Use cases

Built for

Primary

Marketing stills - Match brand crops with precise aspect_ratio and quality settings

#2

Concept art - Flex mode for iterative tuning with steps and CFG before locking a look

#3

Reference-driven design - Product or mood-board images as image_urls alongside the prompt

#4

Key art and posters - Max aspect ratios for cinematic 21:9 layouts

#5

UX and slides - Fast Pro runs when Flex-level tuning is unnecessary

#6

Batch pipelines - Select Flex versus Max per job based on latency and budget

FAQ

About Flux.2 API

Black Forest Labs Flux.2 is offered as three variants: Flex, Pro, and Max. Each has its own generate and status URL; Flex adds steps and CFG, Max unlocks additional aspect ratios compared with Pro.

Use Flex when you want explicit diffusion controls. Use Pro for standard production ratios without tuning steps or CFG. Use Max when you need the extended aspect ratio list, including ultrawide.

The playground sends up to 10 reference image URLs in image_urls for any variant.

Billing keys map per variant (flux.2-flex, flux.2-pro, flux.2-max). Compare the listed rates in the dashboard or docs for each tier.