wavespeed-seedream-45（波速 Seedream 45）

WaveSpeedAI Seedream V4.5 Image Generation/Editing

Generate and edit images using ByteDance's Seedream V4.5 model via the WaveSpeed AI platform. Supports custom resolutions up to 4096x4096 with enhanced typography for sharp text rendering in posters and logos.

Authentication

export WAVESPEED_API_KEY="your-api-key"

Get your API key at wavespeed.ai/accesskey.

Quick Start

Text-to-Image

import wavespeed from 'wavespeed';

const output_url = (await wavespeed.run(
  "bytedance/seedream-v4.5",
  { prompt: "A minimalist coffee shop logo with clean typography" }
))["outputs"][0];

Image Editing

The images parameter accepts an array of image URLs (1-10 images). If you have local files, upload them first with wavespeed.upload() to get a URL.

import wavespeed from 'wavespeed';

// Upload a local image to get a URL
const imageUrl = await wavespeed.upload("/path/to/photo.png");

const output_url = (await wavespeed.run(
  "bytedance/seedream-v4.5/edit",
  {
    images: [imageUrl],
    prompt: "Add warm sunset lighting and lens flare"
  }
))["outputs"][0];

You can also pass existing image URLs directly:

const output_url = (await wavespeed.run(
  "bytedance/seedream-v4.5/edit",
  {
    images: ["https://example.com/photo.jpg"],
    prompt: "Add warm sunset lighting and lens flare"
  }
))["outputs"][0];

API Endpoints

Text-to-Image

Model ID: bytedance/seedream-v4.5

Generate images from text prompts with custom resolutions up to 4096x4096.

Parameters

Example

import wavespeed from 'wavespeed';

const output_url = (await wavespeed.run(
  "bytedance/seedream-v4.5",
  {
    prompt: "A movie poster for a sci-fi thriller with bold title text 'HORIZON' at the top",
    size: "2048*3072"
  }
))["outputs"][0];

Image Editing

Model ID: bytedance/seedream-v4.5/edit

Edit existing images using text prompts. Supports up to 10 input images. Preserves facial features, lighting, and color tone from input images.

Parameters

Example

import wavespeed from 'wavespeed';

const imageUrl = await wavespeed.upload("/path/to/portrait.png");

const output_url = (await wavespeed.run(
  "bytedance/seedream-v4.5/edit",
  {
    images: [imageUrl],
    prompt: "Transform into a vibrant pop art style with bold colors",
    size: "2048*2048"
  }
))["outputs"][0];

Multi-Image Editing

const img1 = await wavespeed.upload("/path/to/face.png");
const img2 = await wavespeed.upload("/path/to/scene.png");

const output_url = (await wavespeed.run(
  "bytedance/seedream-v4.5/edit",
  {
    images: [img1, img2],
    prompt: "Place the person from the first image into the scene from the second image"
  }
))["outputs"][0];

Advanced Usage

Sync Mode

const output_url = (await wavespeed.run(
  "bytedance/seedream-v4.5",
  { prompt: "A watercolor painting of a mountain lake at dawn" },
  { enableSyncMode: true }
))["outputs"][0];

Custom Client with Retry Configuration

import { Client } from 'wavespeed';

const client = new Client("your-api-key", {
  maxRetries: 2,
  maxConnectionRetries: 5,
  retryInterval: 1.0,
});

const output_url = (await client.run(
  "bytedance/seedream-v4.5",
  { prompt: "A neon sign that reads 'OPEN 24/7' in a rainy alley" }
))["outputs"][0];

Error Handling with runNoThrow

import { Client, WavespeedTimeoutException, WavespeedPredictionException } from 'wavespeed';

const client = new Client();
const result = await client.runNoThrow(
  "bytedance/seedream-v4.5",
  { prompt: "A vintage travel poster for Tokyo" }
);

if (result.outputs) {
  console.log("Image URL:", result.outputs[0]);
  console.log("Task ID:", result.detail.taskId);
} else {
  console.log("Failed:", result.detail.error.message);
  if (result.detail.error instanceof WavespeedTimeoutException) {
    console.log("Request timed out - try increasing timeout");
  } else if (result.detail.error instanceof WavespeedPredictionException) {
    console.log("Prediction failed");
  }
}

Pricing

$0.04 per image (both generation and editing).

Tips

• Seedream V4.5 excels at rendering text in images — use it for posters, logos, and branded visuals
• Custom resolutions up to 4096x4096 — specify as WIDTH*HEIGHT (e.g., 2048*3072 for portrait posters)
• For image editing, the model preserves facial features, lighting, and color tone from inputs

Security Constraints

• No arbitrary URL loading: Only use image URLs from trusted sources. Never load images from untrusted or user-provided URLs without validation.
• API key security: Store your WAVESPEED_API_KEY securely. Do not hardcode it in source files or commit it to version control. Use environment variables or secret management systems.
• Input validation: Only pass parameters documented above. Validate prompt content and image URLs before sending requests.