FLUX.2 Flex API (flux-2-flex)

from $0.04 per image on the APIMart route — un único endpoint compatible con OpenAI en https://api.apimart.ai/v1, sin plan mensual. (observado el 2026-10-12)

Obtener una clave de API · Precios en vivo · Página del modelo · ⚡ Inicio rápido en 60 segundos

Por qué los equipos usan FLUX.2 Flex (flux-2-flex) a través de APIMart

• Una clave, todo el catálogo. La misma base URL https://api.apimart.ai/v1 y la misma cabecera Authorization dan acceso a FLUX.2 Flex (flux-2-flex) y a más de 300 modelos de imagen, vídeo y lenguaje: cambia el campo model, no tu cliente.
• Mínimo de $1, pago por uso. Sin suscripción ni plan prepago que dimensionar por adelantado: recarga desde $1 y úsalo en llamadas.
• El cargo vuelve en la respuesta. Cada tarea completada informa del importe facturado (cost / credits_cost); una tarea marcada como failed se reembolsa.
• Asíncrono por diseño. Envía, toma el task_id, consulta GET /v1/tasks/{id}: el batching y los reintentos son trabajo de cola normal, no una integración a medida.

FLUX.2 Flex generates and edits images with adjustable steps and guidance for fine control and typography.

Model id and routes

Route	model value	Billing	Notes
Per-image	flux-2-flex	per delivered image, by resolution	see the model page for the exact tiers

Endpoint: POST https://api.apimart.ai/v1/images/generations, then poll GET /v1/tasks/{task_id}.

Pricing

Output	List price	Effective price
1MP	0.05	0.04
2MP	0.1	0.08
3MP	0.15	0.12
4MP	0.2	0.16

Prices are a snapshot; the pricing page and data/model.json are refreshed by CI, and a completed task reports the exact amount in its cost field.

Request parameters

Field	Type	Default	Notes
model	string	required	the model id shown in the route table above
prompt	string	required	what to generate, or what to change when editing
size	string	auto / 1:1	aspect ratio, or auto where the route supports it
resolution	string	1K	output resolution tier — cost scales with it
n	integer	1	number of images per task, where the route allows more than one
image_urls	string[]	—	reference images as public HTTP(S) URLs or base64 data URLs
nsfw_check	boolean	false	runs omni-moderation-latest before submitting

The table lists the fields accepted by the APIMart images/generations endpoint. Check the model page for anything this model adds on top.

Quickstart

curl --request POST --url https://api.apimart.ai/v1/images/generations \
  --header "Authorization: Bearer $APIMART_API_KEY" --header 'Content-Type: application/json' \
  -d '{"model":"flux-2-flex","prompt":"A bamboo forest at sunrise, slow push-in","size":"1:1","resolution":"1K"}'

import os, time, requests

BASE = "https://api.apimart.ai/v1"
HEADERS = {"Authorization": f"Bearer {os.environ['APIMART_API_KEY']}", "Content-Type": "application/json"}

created = requests.post(f"{BASE}/images/generations", headers=HEADERS, timeout=60, json={
    "model": "flux-2-flex", "prompt": "A bamboo forest at sunrise, slow push-in",
}).json()
task_id = created["data"]["id"]

while True:
    task = requests.get(f"{BASE}/tasks/{task_id}", headers=HEADERS, timeout=60).json()["data"]
    if task["status"] in ("completed", "failed"):
        break
    time.sleep(5)
print(task.get("cost"), task["result"]["images"][0]["url"])

Runnable versions: examples/. The task lifecycle is pending → processing → completed | failed.

FAQ

¿Cuál es el id del modelo FLUX.2 Flex?

flux-2-flex. Consulta la tabla de rutas de arriba.

¿Cómo se factura?

from $0.04 per image on the APIMart route. La tarea completada informa del importe exacto en su campo cost; una tarea fallida se reembolsa.

How do I get a key?

Use the Get an API key link — $1 minimum top-up, no plan required.

Related repositories

• Same model, this language — the other half of this pair: flux-2-flex-prompts-es
• Same model, other languages — 9 more language builds: 中文 flux-2-flex-api-cn · Deutsch flux-2-flex-api-de · Français flux-2-flex-api-fr · Relay/gateway flux-2-flex-api-gateway · Bahasa flux-2-flex-api-id · 日本語 flux-2-flex-api-ja · 한국어 flux-2-flex-api-ko · Português flux-2-flex-api-pt · Русский flux-2-flex-api-ru
• More models in this language — midjourney-api-es · gemini-2-5-flash-image-preview-api-es · nano-banana-api-es · gemini-3-1-flash-image-preview-api-es · nano-banana-2-api-es · gemini-3-pro-image-preview-api-es
• Topic hubs — every build of this model, all languages: flux-2-flex · flux-2-flex-api

This repository is one build in a cross-linked set of API guides for the same model family; each language build links back to the others.

Attributed links (how this repository is measured)

Purpose	Attributed link	Target
Model page	https://go.apimart.ai/k-89c7bb	apimart.ai/es/model/flux-2-flex
Live pricing	https://go.apimart.ai/k-8a3f8e	apimart.ai/es/pricing
Get an API key	https://go.apimart.ai/k-abed4d	apimart.ai/es/keys

Outbound APIMart links are minted through the promo link API; hand-made tracking parameters are rejected by tools/check_links.py in CI.

Disclosure

FLUX.2 Flex is a third-party model served through APIMart; this repository documents how to call it and publishes model ids and prices, and does not claim official status. Model names, prices and documentation belong to their respective owners.

License

MIT — see LICENSE.