Flux 2 Flex

Vendor: Black Forest Labs

Image

Balanced Flux 2 quality with a flexible image workflow

Typical latency: 10-20s
Reference inputs: Up to 10
toolId: flux-2-flex

Input modes

text-to-imageimage-to-image

Parameters

Parameter	Type	Default	Values	Notes
image_size	select	square	auto \| square \| square_hd \| landscape_4_3 \| landscape_16_9 \| portrait_4_3 \| portrait_16_9	Output frame shape and size. Auto matches the reference image when editing.
output_format	select	png	png \| jpeg	File format for the result. PNG keeps transparency; JPEG is smaller.
safety_tolerance	select	2	1 \| 2 \| 3 \| 4 \| 5	How strict the content filter is.
enable_safety_checker	toggle	true	—	NSFW content filter

Pricing

Pricing will be published shortly — contact us for early access rates

Prices last updated: —

API example

POST /v1/generations — flux-2-flex

curl -X POST https://api.mukelabs.com/v1/generations \
  -H "Authorization: Bearer $MUKE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "toolId": "flux-2-flex",
    "inputMode": "text-to-image",
    "prompt": "your prompt here",
    "params": { "image_size": "auto" },
    "references": [],
    "idempotencyKey": "a-unique-key-per-task",
    "subjectId": "your-user-id"
  }'

FAQ

How do I call Flux 2 Flex on Muke Labs?

Submit POST /v1/generations with toolId "flux-2-flex" and one of its input modes (text-to-image, image-to-image), then poll GET /v1/generations/{jobId} for the result.

What does Flux 2 Flex cost?

Public pricing for this model is being finalized — contact us for early access rates. All tasks are billed from your prepaid USD balance and failed tasks refund automatically.

What happens if a task fails?

The job returns status "failed" with a typed error code, and its charge is returned to your balance automatically.

Where do I get an API key?

Create one in the developer portal (https://portal.muke.name), then send it as a Bearer token on every request.