Doubao Seedream 4-0

Technical Specifications of doubao-seedream-4-0-250828

What is doubao-seedream-4-0-250828?

doubao-seedream-4-0-250828 is CometAPI’s platform identifier for ByteDance’s Seedream 4.0 image model, a new-generation visual creation system designed to unify image generation and image editing within a single architecture. According to ByteDance’s official model materials, Seedream 4.0 is built to handle complex multimodal image tasks, including knowledge-based generation, complex reasoning, and reference-consistent creation, while also delivering faster inference than its predecessor and supporting output at up to 4K resolution.

In practical terms, this means the model is positioned not just as a basic text-to-image tool, but as a more flexible creative engine for workflows where users may want to generate images from prompts, edit existing visuals, preserve consistency across subjects, combine multiple references, or produce structured visual assets such as diagrams, posters, and educational illustrations. ByteDance’s official examples also show strong emphasis on style control, text-preserving edits, layout-sensitive modifications, and visually rich outputs across a range of professional and creative scenarios.

Main features of doubao-seedream-4-0-250828

• Unified generation and editing: Seedream 4.0 combines image generation and image editing in one architecture, which makes it suitable for both creating brand-new visuals and modifying existing images without switching between separate models.
• Up to 4K image output: ByteDance states that the model can produce high-definition images at up to 4K resolution, making it relevant for use cases that need sharper detail and more presentation-ready results.
• Multi-reference consistency: Official examples highlight the ability to upload multiple reference images and generate several outputs in one go, helping users maintain character, object, or design consistency across creative tasks.
• Complex multimodal reasoning for visuals: The provider describes Seedream 4.0 as capable of handling knowledge-based generation and complex reasoning, which supports tasks such as educational illustrations, historical timelines, charts, and other structured visual outputs.
• Strong prompt adherence and alignment: ByteDance’s published materials specifically mention competitive performance across prompt adherence, alignment, and aesthetics, indicating that the model is optimized to follow instructions closely while producing visually appealing outputs.
• Text-aware editing and layout preservation: Official examples show the model changing poster text while keeping the original color scheme, font, and alignment unchanged, suggesting usefulness for design-touchup and content-localization workflows.
• Style transformation flexibility: Seedream 4.0 is presented as capable of transforming images into a wide range of artistic styles, including watercolor and cyberpunk, which is valuable for rapid concept exploration and branded creative production.
• Faster inference than the previous generation: ByteDance notes that Seedream 4.0 runs significantly faster than its predecessor, which can improve iteration speed in production or experimentation pipelines.

How to access and integrate doubao-seedream-4-0-250828

Step 1: Sign Up for API Key

To use doubao-seedream-4-0-250828, first register for an account on CometAPI and generate your API key from the dashboard. After signing in, create a key with the appropriate project permissions, store it securely, and make sure it is available to your application through an environment variable or secret manager.

Step 2: Send Requests to doubao-seedream-4-0-250828 API

Use CometAPI's OpenAI-compatible image generation endpoint at POST /v1/images/generations.

curl https://api.cometapi.com/v1/images/generations \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $COMETAPI_API_KEY" \
  -d '{
    "model": "doubao-seedream-4-0-250828",
    "prompt": "a cat wearing a scarf sitting by the window watching rain, illustration style",
    "size": "1024x1024",
    "response_format": "url"
  }'

Step 3: Retrieve and Verify Results

The API returns a JSON response containing the generated image URL or base64 data. Verify the output matches your prompt and quality requirements before using it in production.