Seedream 4.0
Image model · Available upstream
High speed 4K AI image generation and editing model
Generation is available through the published Meldport configurations below. Review the exact quote before submitting.
- Model ID
bytedance-seedream-4-0- Released
- Sep 9, 2025
- Billing unit
- Generated output
Meldport generation prices
Seedream 4.0
dc3d4338-a7fa-411b-96e8-731f5029ff78image to image
1 output
API request and parameters
Use images:generate on your API key. This configuration runs image to image and returns image/jpeg.
Upload an image using the same API key, then replace YOUR_UPLOADED_ASSET_ID. Input upload example. Choose a different configuration ID to change the workflow or output settings. Send only options listed below.
These output settings are included in this configuration. Select another configuration ID to change them. Do not add them to options.
{
"width": 1024,
"height": 1024
}This configuration has no additional request options.
Replace the prompt and set a unique MELDPORT_IDEMPOTENCY_KEY for this operation. The example quotes the request and then creates one paid job. Read the billing rules before accepting variable charges.
const api = "https://api.meldport.com";
const key = process.env.MELDPORT_API_KEY;
const idempotencyKey = process.env.MELDPORT_IDEMPOTENCY_KEY;
if (!key || !idempotencyKey) throw new Error("Set your API key and a unique operation ID first.");
async function post(path, body) {
const response = await fetch(api + path, {method: "POST",
headers: {Authorization: `Bearer ${key}`, "Content-Type": "application/json"},
body: JSON.stringify(body)});
const result = await response.json();
if (!response.ok) throw new Error(JSON.stringify(result.error));
return result;
}
const request = {
"configuration_id": "dc3d4338-a7fa-411b-96e8-731f5029ff78",
"prompt": "Replace with your prompt or speech script.",
"options": {},
"input_asset_ids": [
"YOUR_UPLOADED_ASSET_ID"
]
};
const {data: quote} = await post("/v1/media/quotes", request);
console.log("Quote:", quote);
const result = await post("/v1/media/jobs", {
...request, idempotency_key: idempotencyKey,
accepted_customer_price_microusd: quote.customer_price_microusd,
accepted_maximum_reservation_microusd: quote.maximum_reservation_microusd,
...(quote.billing_policy_version === "actual-cost-v1"
? {billing_policy_version: "actual-cost-v1"} : {}),
});
console.log(result.job);
// Poll GET /v1/media/jobs/<job.id> with the same API key.
// Keep this operation ID for retries. A new ID requests another generation.Poll the returned job ID. Download only after state is succeeded and billing_state is settled. Polling and download example.
Seedream 4.0
6d3465cc-e921-4d80-94ff-29e87e4b638ctext to image
1 output
API request and parameters
Use images:generate on your API key. This configuration runs text to image and returns image/jpeg.
This configuration does not require an uploaded image. Choose a different configuration ID to change the workflow or output settings. Send only options listed below.
These output settings are included in this configuration. Select another configuration ID to change them. Do not add them to options.
{
"width": 1024,
"height": 1024
}This configuration has no additional request options.
Replace the prompt and set a unique MELDPORT_IDEMPOTENCY_KEY for this operation. The example quotes the request and then creates one paid job. Read the billing rules before accepting variable charges.
const api = "https://api.meldport.com";
const key = process.env.MELDPORT_API_KEY;
const idempotencyKey = process.env.MELDPORT_IDEMPOTENCY_KEY;
if (!key || !idempotencyKey) throw new Error("Set your API key and a unique operation ID first.");
async function post(path, body) {
const response = await fetch(api + path, {method: "POST",
headers: {Authorization: `Bearer ${key}`, "Content-Type": "application/json"},
body: JSON.stringify(body)});
const result = await response.json();
if (!response.ok) throw new Error(JSON.stringify(result.error));
return result;
}
const request = {
"configuration_id": "6d3465cc-e921-4d80-94ff-29e87e4b638c",
"prompt": "Replace with your prompt or speech script.",
"options": {},
"input_asset_ids": []
};
const {data: quote} = await post("/v1/media/quotes", request);
console.log("Quote:", quote);
const result = await post("/v1/media/jobs", {
...request, idempotency_key: idempotencyKey,
accepted_customer_price_microusd: quote.customer_price_microusd,
accepted_maximum_reservation_microusd: quote.maximum_reservation_microusd,
...(quote.billing_policy_version === "actual-cost-v1"
? {billing_policy_version: "actual-cost-v1"} : {}),
});
console.log(result.job);
// Poll GET /v1/media/jobs/<job.id> with the same API key.
// Keep this operation ID for retries. A new ID requests another generation.Poll the returned job ID. Download only after state is succeeded and billing_state is settled. Polling and download example.
About this model
Seedream 4.0 is ByteDance’s multimodal image model for fast 2K to 4K generation. It supports text prompts, image editing with natural language, and multi image reference. It maintains style consistency across batches and handles bilingual Chinese and English workflows.