FLUX-2-klein-4b

deepinfra/black-forest-labs/FLUX-2-klein-4b

FLUX.2 [klein] 4B (January 2026), BFL's smallest and fastest image model: a 4B distilled rectified-flow transformer that does text-to-image and multi-reference editing in under a second, runs on consumer GPUs, Apache 2.0.

Get API Key Read the Docs

curl "$AUDIOLAB_API_URL/v1/inference" \
  -H "Authorization: Bearer $AUDIOLAB_API_KEY" \
  -H "Idempotency-Key: $AUDIOLAB_REQUEST_ID" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "deepinfra/black-forest-labs/FLUX-2-klein-4b",
  "prompt": "A mountain lake at sunrise."
}'

Input Price: $0.0119 / image
Output Price: —
Input: Text
Output: Image

Capabilities

Explore what FLUX-2-klein-4b supports, then use the API section for a request tailored to this model.

Model Information

Provider: DeepInfra
Product: Image Generation
Release Date: Jan 15, 2026
Data Policy: Not specified
Region: US
Input: Text
Output: Image

Provider Documentation

Playground

Try FLUX-2-klein-4b by DeepInfra. Requests use the selected workspace’s credits and API pricing.

FLUX-2-klein-4b

This model uses a dedicated input format. Explore its API example or open the supported playground.

View API reference

Providers

Compare available endpoints, pricing, and context limits for FLUX-2-klein-4b.

Provider	Context	Output	Input Price	Output Price	Endpoint
DeepInfra	Not specified	Image	$0.0119 / image	—	`black-forest-labs/FLUX-2-klein-4b`

Prices are catalog rates. Your workspace’s estimate and endpoint pricing determine the final charge.

Input and Output Limits

Formats and limits AudioLab enforces on each request.

Limit	Value
Max units	1
Path	/v1/inference
Native	{"width":1024,"height":1024,"output_format":"png","safety_tolerance":2,"pricingBasis":"published-units-v1"}

Status

Current catalog availability. Your workspace’s access is checked separately before a request runs.

Checking availability…

A live availability check is not available right now.

Getting Started

Use your workspace API key and the exact model identifier below. Set the API URL to the endpoint shown in your workspace and keep credentials on your server.

curl "$AUDIOLAB_API_URL/v1/inference" \
  -H "Authorization: Bearer $AUDIOLAB_API_KEY" \
  -H "Idempotency-Key: $AUDIOLAB_REQUEST_ID" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "deepinfra/black-forest-labs/FLUX-2-klein-4b",
  "prompt": "A mountain lake at sunrise."
}'

Read the Endpoint Reference

Request Parameters

Available parameters depend on the provider and request format. The endpoint reference explains accepted values and required fields.

Parameter	Details
`model`	`deepinfra/black-forest-labs/FLUX-2-klein-4b` — Required model identifier.
`prompt`	View Accepted Values

Input and Output Limits

Formats and limits AudioLab enforces on each request.

Limit	Value
Max units	1
Path	/v1/inference
Native	{"width":1024,"height":1024,"output_format":"png","safety_tolerance":2,"pricingBasis":"published-units-v1"}

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FLUX-2-devDeepInfra	Not specified	$0.0085 / image	—
FLUX-1-devDeepInfra	Not specified	$0.0077 / image	—
FLUX-1-schnellDeepInfra	Not specified	$0.0004 / image	—
sdxl-turboDeepInfra	Not specified	$0.0002 / image	—
Gemini Nano Banana 2.1Google Gemini	Not specified	$1.275 / 1M tokens	$25.50 / 1M tokens

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