Seedream 5.0 Flash API (seedream-5-0-flash) — API ゲートウェイ (日本語)

$0.0137 per image — one price for 1K, 1.5K, 2K and exact pixel sizes — one OpenAI-compatible endpoint at https://api.apimart.ai/v1, no monthly plan required. (observed 2026-10-12)

APIキーを取得 · 最新の料金 · モデルページ · ⚡ 60-second quickstart

Why teams call Seedream 5.0 Flash (seedream-5-0-flash) through APIMart

• One key, entire catalog. The same https://api.apimart.ai/v1 base URL and Authorization header reach Seedream 5.0 Flash and 300+ other image, video and language models — switch the model field, not your client.
• $1 minimum, pay as you go. No subscription and no prepaid plan to size up front: top up from $1 and spend it on calls. There is no free quota to burn through first, so the price in this table is the price you pay.
• The charge comes back in the response. Every completed task reports the amount billed (cost / credits_cost), so a spend number is read per call instead of guessed at month end. A task marked failed is refunded.
• Async by design. Submit, take the task_id, poll GET /v1/tasks/{id} — batching and retries are ordinary queue work, not a bespoke integration.

Seedream 5.0 Flash：OpenAI 互換の base_url と 1 つのキーで、Seedream 5.0 Flash（seedream-5-0-flash）と 300+ の画像・動画・言語モデルを呼び出せます。USD 決済・従量課金・最低 $1 から。

Seedream 5.0 Flash is ByteDance's fast, lower-cost text-to-image model, served on APIMart as seedream-5-0-flash. It generates cinematic 1K, 1.5K and 2K images — or exact pixel sizes — at one per-image price, with strong text rendering, multi-reference style fusion, and unified generation plus editing.

Endpoint: POST https://api.apimart.ai/v1/images/generations (OpenAI-compatible), then poll GET /v1/tasks/{task_id}. Result links expire 72 hours after completion.

The token-billed official route bills per million tokens instead: text_input $1.60, cached_text_input free, image_input $1.60, cached_image_input free, text_output $9.60, image_output $96.00.

Generation is asynchronous — poll the task until it completes. Prices are a snapshot; the 最新の料金 page and data/model.json are refreshed by CI, and a completed task reports the exact amount in its cost field.

Reference images. Up to 10 reference images guide style, character appearance and composition.

Supported aspect ratios: aspect-ratio presets plus exact pixel sizes (e.g. 2048x1024).

curl --request POST --url https://api.apimart.ai/v1/images/generations \
  --header "Authorization: Bearer $APIMART_API_KEY" --header 'Content-Type: application/json' \
  -d '{"model":"seedream-5-0-flash","prompt":"A bamboo forest path under moonlight","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": "seedream-5-0-flash", "prompt": "A bamboo forest path under moonlight",
    "size": "1:1", "resolution": "1K",
}).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"])

const res = await fetch("https://api.apimart.ai/v1/images/generations", {
  method: "POST",
  headers: { Authorization: `Bearer ${process.env.APIMART_API_KEY}`, "Content-Type": "application/json" },
  body: JSON.stringify({ model: "seedream-5-0-flash", prompt: "A bamboo forest path under moonlight",
                          size: "1:1", resolution: "1K" }),
});
const { data } = await res.json();      // data.id is the task id — poll /v1/tasks/<id>

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

Each row is one API call. Costs follow the price table above.

Output	Recipe	Ratio	Cost	Prompt
	Product / e-commerce	1:1	$0.0137	Studio hero shot of a frosted glass perfume bottle on a wet black stone slab, single softbox from the left, faint mist, deep charcoal background, crisp label text, commercial product photography
	Food photography	4:3	$0.0137	Overhead flat lay of a spicy miso ramen bowl with soft boiled egg, nori and scallions, dark ceramic table, chopsticks resting on the rim, natural window light, editorial food photography
	Cinematic still	16:9	$0.0137	Rain soaked Kyoto alley at night, paper lantern reflections on wet stone, a lone figure with a transparent umbrella walking away, cinematic 35mm still, shallow depth of field, film grain
	Architecture	16:9	$0.0137	Minimalist concrete villa on a cliff at dusk, warm interior light, infinity pool reflecting a violet sky, architectural photography, 24mm perspective, ultra sharp
	Fashion portrait	3:4	$0.0137	Editorial fashion portrait of a model in an oversized ivory wool coat, seamless light grey studio backdrop, crisp high key lighting, medium format detail, calm expression
	Illustration	1:1	$0.0137	Layered paper cut illustration of a mountain lake at sunrise, five depth layers, soft pastel palette, subtle drop shadows, art print composition, clean vector edges
	Design / UI	16:9	$0.0137	Flat vector dashboard panel showing three gauge dials and abstract latency curves, muted blue and sand palette, generous white space, crisp geometric cards, no placeholder text
	Macro nature	3:2	$0.0137	Macro photograph of a dew covered dandelion seed head against deep black background, focus stacked detail, iridescent droplets, studio lighting

Sources and costs are also in data/samples.json.

What is the Seedream 5.0 Flash model id?

seedream-5-0-flash. See the route table above for the exact values this model accepts.

How is a Seedream 5.0 Flash image billed?

List price $0.017143; the effective rate reflects the standard discount tier.

How long do result links last?

72 hours after completion — read expires_at and copy the files out.

What happens if a task fails?

A task marked failed is refunded and reports cost = 0. A network error while polling status does not by itself mean the task failed — re-query the task id.

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

Seedream 5.0 Flash 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. The renders in this README were produced through the APIMart image API and are shown as examples of the API's output.

README.md             model id, routes, pricing, parameters, quickstart, samples, FAQ
data/model.json       the pricing record for this model (CI-refreshed)
data/samples.json     prompt recipes used for the sample renders
tools/check_links.py  attribution guard
examples/             curl, Python and JavaScript clients
assets/               sample renders (JPEG, resized for the README)

MIT — see LICENSE.