FLUX.2 API pricing: Pro and Flex cost per image

FLUX.2 API pricing is per image. On Black Forest Labs' own API, FLUX.2 [pro] starts at $0.03 per text-to-image output and FLUX.2 [flex] at $0.05, and the price rises with output resolution. Through Sume's POST /v1/images, FLUX.2 Pro costs $0.0375 and FLUX.2 Flex $0.0625 per image, plus a 5.5% agent fee by default.

Black Forest Labs' prices come from its pricing page, read on 2026-09-28. Sume's prices are computed from the pricing code behind GET /v1/images/models, and the request details come from the Image API docs.

What does FLUX.2 cost on Black Forest Labs' API?

Black Forest Labs sells credits at 1 credit = $0.01, with the same price in the API and its Playground. FLUX.2 uses megapixel-based pricing, so these are starting prices that rise with output resolution.

• Batch requests multiply the base cost by the number of images: four FLUX.2 [pro] images start at $0.12.
• FLUX.2 [dev] has no hosted API on Black Forest Labs' side.

What does FLUX.2 cost through Sume?

Sume's catalog has two FLUX.2 ids. In current pricing code each one has a single list rate per image, and Sume bills the list rate × 1.25. Image billing is all-or-nothing: a completed generation is billed in full, and a failed or canceled one is not billed (Image API).

• The pricing line on GET /v1/images/models/{model_id}/endpoints is the amount charged per image, with Sume's margin already applied. Read it before a large batch.
• Every 200 response carries usage.cost, the USD amount billed to your wallet.
• API pricing and AI image generator API cost compare FLUX.2 with the rest of the image catalog.

How do I call the FLUX.2 API on Sume?

Send the model id and a prompt. In current catalog code both FLUX.2 ids accept 1:1, 16:9, 9:16, 4:3 and 3:4 among their aspect ratios. provider.options must be omitted or empty.

curl -X POST "https://api.sume.com/v1/images" \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "black-forest-labs/flux.2-pro",
    "prompt": "a glass teapot on a linen tablecloth, soft window light",
    "aspect_ratio": "16:9"
  }'

Should I use FLUX.2 Pro or Flex?

On Sume, the documented difference between the two ids is the price. Sume's docs show FLUX.2 only with a text prompt, so treat both as text-to-image there. Black Forest Labs describes [pro] as for production workflows and [flex] as for fine-grained control and typography; run the same prompt through both before you commit a batch.

Sume's catalog doesn't include FLUX.2 [max], FLUX.2 [klein] or FLUX.2 [dev]. For [max] or [klein], call Black Forest Labs' own API; [dev] is local only.