Mage API · Image model

Flux 2 API

Long prompts and multi-reference edits

Get an API keyTry Flux 2 in the playground
POST https://api.mage.space/v1/flux2/generate

At a glance

The Flux 2 API runs Flux 2 through Mage at POST https://api.mage.space/v1/flux2/generate. A request at the default settings costs 40 Gems (about $0.04), with no subscription. Flux 2 takes no @handle mentions.

Overview

What the Flux 2 API does

Flux 2 Dev, the open-weights model that thrives on long, detailed prompts. Generates or edits from up to 3 reference images, up to 2K.

Flux 2 Dev, an open-weights model for long, detailed prompts, generation, and edits from up to three reference images.

It accepts image, additional_images as inputs.

Quick start

Call the Flux 2 API

Set MAGE_API_KEY, submit to /flux2/generate, and poll status_url until the request completes.

cURL
STATUS_URL=$(curl --request POST 'https://api.mage.space/v1/flux2/generate' \
  --header "Authorization: Bearer $MAGE_API_KEY" \
  --header 'Content-Type: application/json' \
  --data '{
  "prompt": "Editorial portrait in soft daylight, 35mm film look",
  "aspect_ratio": "4:5",
  "model_id": "flux2-dev"
}' | jq -r '.status_url')

# Repeat until status is "completed"; result.url is the file
curl "$STATUS_URL" --header "Authorization: Bearer $MAGE_API_KEY"
Python
import os, time, requests

headers = {"Authorization": f"Bearer {os.environ['MAGE_API_KEY']}"}
request = requests.post(
    "https://api.mage.space/v1/flux2/generate",
    headers=headers,
    json={
      "prompt": "Editorial portrait in soft daylight, 35mm film look",
      "aspect_ratio": "4:5",
      "model_id": "flux2-dev"
    },
).json()

while request["status"] in ("queued", "in_progress"):
    time.sleep(3)
    request = requests.get(request["status_url"], headers=headers).json()

print(request["status"], request["result"] and request["result"]["url"])
JavaScript
const headers = {
  Authorization: `Bearer ${process.env.MAGE_API_KEY}`,
  'Content-Type': 'application/json',
};
let request = await fetch('https://api.mage.space/v1/flux2/generate', {
  method: 'POST',
  headers,
  body: JSON.stringify({
    "prompt": "Editorial portrait in soft daylight, 35mm film look",
    "aspect_ratio": "4:5",
    "model_id": "flux2-dev"
  }),
}).then((response) => response.json());

while (['queued', 'in_progress'].includes(request.status)) {
  await new Promise((resolve) => setTimeout(resolve, 3000));
  request = await fetch(request.status_url, { headers }).then((r) => r.json());
}

console.log(request.status, request.result?.url);

Models

Flux 2 model_id values

Send model_id to pick a variant. A request without one runs the default.

model_idNameDefault
flux2-devFlux 2Yes

Options

Flux 2 parameters

Allowed values across all variants; a variant may offer fewer. The docs list the options per variant.

FieldValues
aspect_ratio21:9, 16:9, 3:2, 5:4, 1:1, 4:5, 2:3, 9:16, 9:21
resolution1k, 2k

Inputs

Media inputs Flux 2 accepts

Send each as an https URL, a data URL, or an upload of up to 100 MB.

FieldRole
imageThe reference image.
additional_imagesAdditional reference images.

More image models

Other image generation APIs on Mage

Image · from 9 Gems

GPT Image 2 API

Precise prompts and readable text

Image · from 75 Gems

Grok Image API

Grok Imagine, in three quality tiers

Image · from 37 Gems

Guava API

Photorealism that passes for a photograph

Image · from 20 Gems

HiDream API

Fast and versatile, with negative prompts

Image · from 20 Gems

Krea 2 API

Gorgeous aesthetics in seconds

Image · from 135 Gems

Mango API

Our flagship image family

FAQ

Frequently asked questions

How much does the Flux 2 API cost?

A Flux 2 request at the default settings (Flux 2) costs 40 Gems, about $0.04. Other resolutions, durations, and variants change the price; the response reports the exact charge. A generation that fails is refunded; one Mage's content policy blocks is not.

What is the Flux 2 API endpoint?

POST https://api.mage.space/v1/flux2/generate with an Authorization: Bearer header carrying your Mage API key. The response includes a status_url to poll for the result.

Which Flux 2 models can I call?

flux2-dev. The default is Flux 2.

Does Flux 2 support reference images or characters?

Flux 2 accepts image, additional_images. Flux 2 takes no @handle mentions.

Can I use Flux 2 from Claude or ChatGPT?

Yes. Connect the Mage MCP server to Claude, ChatGPT, Claude Code, Grok, or Cursor and ask for Flux 2 by name. Your assistant reads its options with get_model and quotes the price before it generates.

How long are Flux 2 results kept?

Results and inputs are kept for 30 days. Download anything you want to keep to your own storage.

Start building with Mage

One account, one Gems balance, every model. Pay only for what you generate.

Get an API keyTry Flux 2 in the playground

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