Seedream 4.5 Sequential
doubao/seedream-4.5/text-to-image-sequential
Seedream 4.5 Sequential generates multi-image sets with consistent characters and objects, unifying palette, lighting, and style across all outputs. Supports up to 4K results for campaigns, storyboards, and product lines. 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. |
| max_imagesMax Images | slider | 1 | 1 ~ 15 · step 1 | The maximum number of images that can be generated (up to 15). This value must align with the number of images specified in the prompt above. |
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-sequential" \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"input": {
"prompt": "A futuristic cityscape at night with neon lights, flying cars, and people walking in cyberpunk attire. The scene includes towering skyscrapers with glowing advertisements and a vibrant, bustling atmosphere. Please generate a set of 5 images.",
"size": "4K",
"aspect_ratio": "16:9",
"max_images": 5
}
}'
# 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-sequential",
headers=HEADERS,
json={
"input": {
"prompt": "A futuristic cityscape at night with neon lights, flying cars, and people walking in cyberpunk attire. The scene includes towering skyscrapers with glowing advertisements and a vibrant, bustling atmosphere. Please generate a set of 5 images.",
"size": "4K",
"aspect_ratio": "16:9",
"max_images": 5
}
},
)
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-sequential", {
method: "POST",
headers: { ...HEADERS, "Content-Type": "application/json" },
body: JSON.stringify({
"input": {
"prompt": "A futuristic cityscape at night with neon lights, flying cars, and people walking in cyberpunk attire. The scene includes towering skyscrapers with glowing advertisements and a vibrant, bustling atmosphere. Please generate a set of 5 images.",
"size": "4K",
"aspect_ratio": "16:9",
"max_images": 5
}
}),
});
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 Sequential
Effortless multi-image generation with consistent style and character fidelity
Seedream 4.5 Sequential is a cutting-edge text-to-image model designed to generate cohesive multi-image sets. It ensures character and object consistency across all outputs while maintaining a unified palette, lighting, and style. Ideal for campaigns, storyboards, and product lines, this model supports resolutions up to 4K and offers affordable pricing with no cold starts.
🚀 Key Features
- Character Consistency: Locks onto the same character identity (e.g., face, hairstyle, body shape) across all generated images.
- Object & Prop Stability: Ensures key objects (products, logos, props) remain consistent across the image set.
- Unified Visual Style: Maintains consistent palette, lighting, camera angles, and rendering style throughout.
- Multi-Image Output: Generate up to 15 images in a single request, all driven by the same prompt.
- 4K-Ready Detail: Supports resolutions up to 8192 × 8192 pixels for high-quality visuals.
- Typography Awareness: Excels at rendering branded content, titles, and UI-like elements directly onto images.
🛠️ Technical Specifications
| Specification | Details |
|---|---|
| Model Architecture | Proprietary Bytedance Seedream V4.5 Sequential |
| Task Type | Text-to-Image |
| Input Format | Prompt (string) |
| Output Format | Image (PNG, JPEG) |
| Resolution | Default: 2048 × 2048; Range: 512 × 512 to 8192 × 8192 |
| Max Images | Default: 1; Range: 1 to 15 |
| Pricing | $0.04 per image |
| Latency | Optimized for low-latency inference with no cold starts |
Sample Prompts
- Prompt: "Same girl with red hoodie and headphones, different city locations, cinematic lighting."
- Prompt: "A product lineup featuring consistent branding and colorways, with modern studio lighting."
💰 Pricing
| Max Images | Total Price |
|---|---|
| 1 | $0.04 |
| 4 | $0.16 |
| 8 | $0.32 |
| 15 | $0.60 |
Pricing is calculated as $0.04 × max_images. The exact cost is displayed in the WaveSpeedAI interface before execution.
💡 Best Use Cases
- Comic Strips & Story Panels: Create visual narratives with recurring characters and props.
- Brand Campaign Visuals: Generate consistent hero KVs and campaign sets.
- Product Line Visualization: Showcase product variations or colorways in a unified style.
- Storyboards & Animatics: Produce keyframes for pre-production workflows.
- Social Media Content: Design coherent series for grid-based platforms.
🔗 Related Models
- Seedream V4: Single-image generator for standalone hero shots and illustrations.
- Nano Banana Pro: Google’s low-cost, high-throughput model for quick ideation.
- Qwen Image Edit Plus: Advanced model for text rendering and visual storytelling.
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