ByteDance Seedream 4.5
doubao/seedream-4.5/text-to-image
ByteDance Seedream 4.5 is a next-gen text-to-image model optimized for typography—crisper text rendering, stronger prompt adherence, and up to 4K output for posters and brand visuals. Ready-to-use REST inference API, best performance, no cold starts, affordable pricing.
Examples
Parameters
| Name | Type | Default | Constraints | Description |
|---|---|---|---|---|
| prompt *Prompt | textarea | — | ≤ 5000 chars | The positive prompt for the generation. |
| sizeSize | select | 2K | 2K | 4K | Output resolution tier. The selected aspect ratio is converted to MaaS pixel dimensions. |
| aspect_ratioAspect Ratio | select | 1:1 | 1:1 | 3:2 | 2:3 | 3:4 | 4:3 | 9:16 | 16:9 | 21:9 | The aspect ratio of the generated image. |
Output fields
| Field | Type | Description |
|---|---|---|
| images | array<string> | Generated image URLs |
API
Call this model through one unified REST API. Get a key on the API Keys page.
cURL
# 1) Submit — returns { "task_uuid": "..." }
curl -X POST "https://www.namifusion.com/api/v1/marketplace/run/doubao/seedream-4.5/text-to-image" \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"input": {
"prompt": "A futuristic cityscape with towering skyscrapers, neon lights reflecting on wet streets, and flying cars zooming through the sky.",
"size": "4K",
"aspect_ratio": "16:9"
}
}'
# 2) Poll until status is "completed", then read the output URLs
curl "https://www.namifusion.com/api/v1/marketplace/run/tasks/TASK_UUID" \
-H "Authorization: Bearer YOUR_API_KEY"Python
import time, requests
API_KEY = "YOUR_API_KEY"
HEADERS = {"Authorization": f"Bearer {API_KEY}"}
# 1) Submit
resp = requests.post(
"https://www.namifusion.com/api/v1/marketplace/run/doubao/seedream-4.5/text-to-image",
headers=HEADERS,
json={
"input": {
"prompt": "A futuristic cityscape with towering skyscrapers, neon lights reflecting on wet streets, and flying cars zooming through the sky.",
"size": "4K",
"aspect_ratio": "16:9"
}
},
)
resp.raise_for_status() # 401/402/429/5xx stop here instead of polling a bad task
task = resp.json()
# 2) Poll until a terminal state (completed / failed / cancelled).
# This model is allowed up to 300s server-side.
deadline = time.time() + 360
while task.get("status") not in ("completed", "failed", "cancelled"):
if time.time() > deadline:
raise TimeoutError(f"still {task.get('status')} — keep the task_uuid and poll later")
time.sleep(3)
poll = requests.get(f"https://www.namifusion.com/api/v1/marketplace/run/tasks/{task['task_uuid']}", headers=HEADERS)
poll.raise_for_status()
task = poll.json()
print(task["status"], task.get("output"))JavaScript
const API_KEY = "YOUR_API_KEY";
const HEADERS = { Authorization: `Bearer ${API_KEY}` };
// 1) Submit
const resp = await fetch("https://www.namifusion.com/api/v1/marketplace/run/doubao/seedream-4.5/text-to-image", {
method: "POST",
headers: { ...HEADERS, "Content-Type": "application/json" },
body: JSON.stringify({
"input": {
"prompt": "A futuristic cityscape with towering skyscrapers, neon lights reflecting on wet streets, and flying cars zooming through the sky.",
"size": "4K",
"aspect_ratio": "16:9"
}
}),
});
if (!resp.ok) throw new Error(`submit failed: ${resp.status} ${await resp.text()}`);
let task = await resp.json();
// 2) Poll until a terminal state (completed / failed / cancelled).
// This model is allowed up to 300s server-side.
const deadline = Date.now() + 360 * 1000;
while (!["completed", "failed", "cancelled"].includes(task.status)) {
if (Date.now() > deadline) throw new Error(`still ${task.status} — keep the task_uuid and poll later`);
await new Promise((r) => setTimeout(r, 3000));
const poll = await fetch(`https://www.namifusion.com/api/v1/marketplace/run/tasks/${task.task_uuid}`, { headers: HEADERS });
if (!poll.ok) throw new Error(`poll failed: ${poll.status}`);
task = await poll.json();
}
console.log(task.status, task.output);Documentation
Seedream 4.5
Next-gen text-to-image model optimized for typography and high-resolution outputs
Seedream 4.5 is a state-of-the-art text-to-image model designed for creating visually stunning and text-rich images. With enhanced typography capabilities, strong prompt adherence, and support for resolutions up to 4K, it is ideal for posters, brand visuals, and marketing assets. The model offers ready-to-use REST API integration, ensuring fast performance with no cold starts and competitive pricing.
🚀 Key Features
- Enhanced Typography: Delivers sharp, legible text rendering for posters, logos, and UI designs.
- High-Resolution Output: Supports custom dimensions with resolutions ranging from 512×512 to 8192×8192 pixels.
- Strong Prompt Adherence: Accurately follows detailed descriptions for layout, style, and subject.
- Designer-Level Composition: Handles complex layouts with clear hierarchy, including titles, subtitles, and embedded text.
- Aesthetic Quality: Benchmarked for superior visual quality using industry-standard evaluation tools.
- No Cold Starts: Immediate inference availability ensures consistent and fast performance.
🛠️ Technical Specifications
| Parameter | Description | Default | Range |
|---|---|---|---|
| Prompt | Positive prompt for generation. | - | - |
| Size | Specify width and height of the generated image (pixels). | 2048×2048 | 512×512 to 8192×8192 |
| Resolution | Maximum supported resolution for outputs. | - | Up to 8192×8192 |
| Output Format | URL or BASE64-encoded image. | URL | - |
| Latency | Fast inference without cold starts. | - | - |
Sample Prompts
- Prompt: “A modern poster design with bold typography, featuring a white all-caps title at the top and a small gray subtitle below. Background is abstract with blue gradients.”
- Prompt: “A brand logo with sharp text, minimalist style, and a circular emblem in the center.”
💰 Pricing
| Resolution | Price per Image |
|---|---|
| Standard | $0.04 |
💡 Best Use Cases
- Poster and Banner Design: Create text-heavy visuals for marketing campaigns and events.
- Brand Visual Creation: Generate logos, campaign assets, and branded imagery.
- E-commerce Product Imagery: Produce high-quality hero shots and product visuals.
- Social Media Graphics: Design engaging posts with integrated typography.
🔗 Related Models
- Seedream V4: Previous generation with strong illustration capabilities and diverse styles.
- Nano Banana Pro: Ideal for ultra-low-cost, multi-image generation in large batches.
- Z-Image-Turbo: Optimized for speed and throughput with bilingual support.
- FLUX.2 [Pro]: Best for cinematic, style-flexible hero shots.
Choose Seedream 4.5 for text-heavy creative projects requiring high-resolution outputs and precise typography.
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