FLUX.2 Flex API

blackforestlabs/flux-2-flex
Configurable FLUX.
Output
$0.065 / MP (variable)
Released
Jun 12, 2026

How to use FLUX.2 Flex API

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

r = requests.post(
    "https://api.aimlapi.com/v1/images/generations",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "blackforestlabs/flux-2-flex",
      "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-flex",
    "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-flex","prompt":"A cat holding a sign that says hello"}'

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

FLUX.2 Flex API Pricing

TypePrice
Output
$0.065 / MP (variable)

FLUX.2 Flex Benchmarks

BenchmarkScoreWhat it measuresSourceRetrieved
Text-to-Image Arena
1026
Human preference Elo from blind pairwise comparisons of generated images, measured independently by Artificial AnalysisSourceSeptember 28, 2026

FLUX.2 Flex vs other models

ModelInputOutputContextBest for
FLUX.2 Flex
This page
$0.065 / 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 Flex takes image, text as input and returns image.

FLUX.2 Flex became available on June 12, 2026.

FLUX.2 Flex is priced at $0.065 / MP (variable).

FLUX.2 Flex is billed per generation — a fixed charge per output rather than by prompt length.

Yes, FLUX.2 Flex accepts image input as well as a text prompt.

FLUX.2 Flex was built by Black Forest Labs.

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

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

No. It is an image generation model that turns text or text-plus-image prompts into images.

It is a configurable version of FLUX.2 designed to balance image quality, generation speed, and user control.

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