Seedream V5.0 Pro Text to Image API
doubao/seedream-v5.0-pro/text-to-image
Seedream V5.0 Pro Text to Image by ByteDance generates high-quality images from text prompts, with aspect ratio selection, strong prompt following, and 1K / 2K output tiers for flexible image creation. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.
Examples



Parameters
| Name | Type | Default | Constraints | Description |
|---|---|---|---|---|
| prompt *Prompt | textarea | — | ≤ 5000 chars | The positive prompt for the generation. |
| resolution *Resolution | select | 1k | 1k | 2k | The output resolution tier used for billing. 1k is the lower-cost tier; 2k is the higher-cost tier. |
| aspect_ratioAspect Ratio | select | 1:1 | 1:1 | 1:2 | 2:1 | 1:3 | 3:1 | 2:3 | 3:2 | 3:4 | … | The aspect ratio of the generated image. |
| output_formatOutput Format | select | — | jpeg | png | The format of the output image. |
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-v5.0-pro/text-to-image" \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"input": {
"prompt": "A cinematic portrait of a young astronaut standing in a lush bioluminescent forest at dusk, soft blue and purple lighting, intricate space suit details, floating particles in the air, ultra-realistic, highly detailed, atmospheric depth, sharp focus",
"resolution": "2k",
"aspect_ratio": "4:5",
"output_format": "png"
}
}'
# 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-v5.0-pro/text-to-image",
headers=HEADERS,
json={
"input": {
"prompt": "A cinematic portrait of a young astronaut standing in a lush bioluminescent forest at dusk, soft blue and purple lighting, intricate space suit details, floating particles in the air, ultra-realistic, highly detailed, atmospheric depth, sharp focus",
"resolution": "2k",
"aspect_ratio": "4:5",
"output_format": "png"
}
},
)
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-v5.0-pro/text-to-image", {
method: "POST",
headers: { ...HEADERS, "Content-Type": "application/json" },
body: JSON.stringify({
"input": {
"prompt": "A cinematic portrait of a young astronaut standing in a lush bioluminescent forest at dusk, soft blue and purple lighting, intricate space suit details, floating particles in the air, ultra-realistic, highly detailed, atmospheric depth, sharp focus",
"resolution": "2k",
"aspect_ratio": "4:5",
"output_format": "png"
}
}),
});
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 V5.0 Pro Text to Image API
High-quality text-to-image generation with strong prompt adherence, flexible aspect ratios, and no cold starts.
Seedream V5.0 Pro is ByteDance’s advanced text-to-image model for developers and teams that need polished visual output with efficient production workflows. It combines strong prompt following, flexible aspect ratio support, 1K and 2K output tiers, and reliable no-cold-start performance for cost-effective image generation at scale.
🚀 Key Features
- Pro-grade image quality: Built for high-quality text-to-image generation suitable for creative, marketing, and production use.
- Strong prompt adherence: Accurately follows subject, scene, style, lighting, and composition instructions for more predictable results.
- Flexible aspect ratios: Supports square, portrait, landscape, tall, and ultrawide layouts for a wide range of publishing formats.
- Simple resolution tiers: Choose 1k for lower-cost iteration or 2k for higher-resolution final outputs.
- Standard output formats: Export generated images in jpeg or png depending on workflow needs.
- No cold starts: Designed for responsive, ready-to-run generation in production environments.
🛠️ Technical Specifications
| Item | Details |
|---|---|
| Model Name | Seedream V5.0 Pro |
| Model ID | bytedance/seedream-v5.0-pro |
| Task Type | Text-to-image |
| Model Architecture | Advanced ByteDance text-to-image model |
| Input | Text prompt |
| Output | Single image |
| Output Format | jpeg, png |
| Aspect Ratio | 1:1, 1:2, 2:1, 1:3, 3:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 9:21, 21:9 |
| Resolution | 1k, 2k |
| Default Aspect Ratio | 1:1 |
| Default Resolution | 1k |
| Default Output Format | jpeg |
| Latency Profile | No cold starts; optimized for responsive generation |
| Typical Workflow | Write prompt → choose aspect ratio → choose resolution → choose output format → generate image |
Sample Prompts
Luxury skincare product shot on a marble surface, soft side lighting, minimal background, premium commercial photography, crisp details, elegant compositionFuturistic city street at night after rain, neon reflections, cinematic wide-angle composition, blue and purple color palette, ultra-detailedOriginal anime-style character design sheet, full-body front view, clean background, intricate costume details, vibrant illustration style
💰 Pricing
| Resolution | Price |
|---|---|
| 1k | $0.045 |
| 2k | $0.090 |
💡 Best Use Cases
- Marketing creatives: Generate campaign visuals, social media graphics, promotional assets, and branded content.
- Creative concepting: Explore characters, environments, products, and visual directions from natural language prompts.
- E-commerce and brand production: Create layout-specific product visuals, banners, and merchandising assets efficiently.
- Production image workflows: Use 1k for rapid prompt iteration and 2k for higher-resolution final delivery.
🔗 Related Models
- Seedream V5.0 Pro Edit: A related model for text-guided image editing workflows.
- Seedream V5.0 Lite: A lighter-weight alternative for users prioritizing efficiency and lower-cost generation.
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