FLUX.2 Klein 9B Preview API

blackforestlabs/flux-2-klein-9b-preview
Preview release of the compact FLUX.
Output
$0.0195 / MP (variable)
Released
Jun 12, 2026

How to use FLUX.2 Klein 9B Preview API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to blackforestlabs/flux-2-klein-9b-preview.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/images/generations",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "blackforestlabs/flux-2-klein-9b-preview",
      "prompt": "A cat holding a sign that says hello"
    },
)
print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/images/generations", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "blackforestlabs/flux-2-klein-9b-preview",
    "prompt": "A cat holding a sign that says hello"
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/images/generations \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"blackforestlabs/flux-2-klein-9b-preview","prompt":"A cat holding a sign that says hello"}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

FLUX.2 Klein 9B Preview API Pricing

TypePrice
Output
$0.0195 / MP (variable)

FLUX.2 Klein 9B Preview vs other models

ModelInputOutputContextBest for
$0.0195 / MP (variable)
Image generation at scale
$0.325 / 1M tokens
$78 / 1M tokens
128K tokens
Image generation at scale
$6.5 / 1M tokens
$39 / 1M tokens
Image generation at scale
Image generation at scale
$0.0195 / MP (variable)
Image generation at scale

Frequently asked questions

FLUX.2 Klein 9B Preview takes image, text as input and returns image.

FLUX.2 Klein 9B Preview became available on June 12, 2026.

FLUX.2 Klein 9B Preview is priced at $0.0195 / MP (variable).

FLUX.2 Klein 9B Preview is billed per generation — a fixed charge per output rather than by prompt length.

Yes, FLUX.2 Klein 9B Preview accepts image input as well as a text prompt.

FLUX.2 Klein 9B Preview was built by Black Forest Labs.

Send a request to https://api.aimlapi.com/v1/images/generations with blackforestlabs/flux-2-klein-9b-preview as the model id.

Yes. FLUX.2 Klein 9B Preview is served through AI/ML API, so the same key and endpoint format used for other models applies.

It is a preview release of the compact FLUX.2 Klein 9B model from Black Forest Labs.

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