FLUX.2

FLUX.2 is Black Forest Labs' resolution-controlled image family on Pixapi. Choose flux-2-pro, flux-2-max, or flux-2-flex, then pass resolution as 1MP, 2MP, 3MP, or 4MP.

API surface

Operation	Endpoint	Mode
Image generation	POST /v1/images/generations	Sync
Image generation task	POST /v1/async/images/generations	Async
Image editing	POST /v1/images/edits	Sync
Image editing task	POST /v1/async/images/edits	Async

Model ids

Model id	Best for
flux-2-pro	Balanced FLUX.2 quality and credit cost
flux-2-max	Highest-quality FLUX.2 output
flux-2-flex	Flexible FLUX.2 resolution tiers

Pricing

Model id	1MP	2MP	3MP	4MP
flux-2-pro	3	4	5	6
flux-2-max	6	8	11	13
flux-2-flex	4	8	12	16

If you omit resolution, Pixapi bills the 1MP tier.

Request fields

Send the common fields at the top level. Put the model-specific controls listed below inside providerOptions.

Field	Type	Required	Description
model	string	Yes	flux-2-pro, flux-2-max, flux-2-flex. Case-sensitive model ID.
prompt	string	Yes	Describe the subject, composition, style, and requested edits. Pixapi keeps the first 2,000 characters; provide a non-empty prompt for both generation and editing.
n	integer	No	Default 1; only integer 1 is supported.
size	string	No	Use pixel dimensions WIDTHxHEIGHT, for example 1024x1024.
image	string / string[]	For edits	Public HTTP(S) image URL or URL array; required on /images/edits. Up to 8 references. Output plus all references must total ≤ 9 MP; output ≤ 4 MP. Pixapi currently accepts at most 4 reference images.
resolution	string	No	1MP (Pixapi default), 2MP, 3MP, 4MP; 1 MP = 1,048,576 pixels. Controls the billed tier.
providerOptions	object	No	Model-specific options; see the table below.

providerOptions

All fields in this table are nested inside providerOptions, not alongside model.

Field	Type	Description
nsfw_check	boolean	Optional prompt/image moderation; default false.
output_format	string	Output image format: jpeg (default), png, or webp.
seed	integer	Random generation seed; omit for a random result.
prompt_upsampling	boolean	Improve and expand the prompt; default false.
safety_tolerance	integer	0–5, default 2; higher values allow more permissive filtering.
steps	integer	Flex only: 1–50, default 50; more steps take longer.
guidance	number	Flex only: 1.5–10, default 5; higher values follow the prompt more strongly.

Input rules

Use size for pixels and resolution for the tier.

Example

cURL

curl https://api.pixapi.ai/v1/images/generations \
  -H "Authorization: Bearer $PIXAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"flux-2-pro","prompt":"A clean editorial product photo on a warm gray background","n":1,"resolution":"2MP"}'

Python

import os
import requests

response = requests.post(
    "https://api.pixapi.ai/v1/images/generations",
    headers={
        "Authorization": f"Bearer {os.environ['PIXAPI_KEY']}",
        "Content-Type": "application/json",
    },
    json={
  "model": "flux-2-pro",
  "prompt": "A clean editorial product photo on a warm gray background",
  "n": 1,
  "resolution": "2MP"
},
)
response.raise_for_status()
print(response.json())

JavaScript

const response = await fetch('https://api.pixapi.ai/v1/images/generations', {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.PIXAPI_KEY}`,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "model": "flux-2-pro",
  "prompt": "A clean editorial product photo on a warm gray background",
  "n": 1,
  "resolution": "2MP"
}),
});

if (!response.ok) {
  throw new Error(await response.text());
}

console.log(await response.json());

Go

package main

import (
  "bytes"
  "fmt"
  "io"
  "net/http"
  "os"
)

func main() {
  body := []byte(`{
  "model": "flux-2-pro",
  "prompt": "A clean editorial product photo on a warm gray background",
  "n": 1,
  "resolution": "2MP"
}`)

  req, err := http.NewRequest(
    "POST",
    "https://api.pixapi.ai/v1/images/generations",
    bytes.NewBuffer(body),
  )
  if err != nil {
    panic(err)
  }
  req.Header.Set("Authorization", "Bearer "+os.Getenv("PIXAPI_KEY"))
  req.Header.Set("Content-Type", "application/json")

  resp, err := http.DefaultClient.Do(req)
  if err != nil {
    panic(err)
  }
  defer resp.Body.Close()

  result, _ := io.ReadAll(resp.Body)
  fmt.Println(string(result))
}

Edit an image

{
  "model": "flux-2-pro",
  "prompt": "Replace the background with a minimalist studio set",
  "image": "https://example.com/input.png",
  "n": 1
}

For async requests and task polling, see Async Media Tasks.

For the shared response shape, see the API Reference.