Image Generation

ByteDance

Seedream 3.0 API

Seedream 3.0 is ByteDance’s latest bilingual (Chinese–English) text-to-image foundation model. It delivers **native high-resolution** outputs, **lightning-fast** generation speeds, and **industry-leading** text-rendering capabilities, positioning it as a major competitor in AI-driven visual content creation
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import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.cometapi.com/v1",
    api_key="<YOUR_API_KEY>",    
)

response = client.chat.completions.create(
    model="Seedream 3.0",
    messages=[
        {
            "role": "system",
            "content": "You are an AI assistant who knows everything.",
        },
        {
            "role": "user",
            "content": "Tell me, why is the sky blue?"
        },
    ],
)

message = response.choices[0].message.content

print(f"Assistant: {message}")

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Seedream 3.0 API

Seedream 3.0 is ByteDance’s latest bilingual (Chinese–English) text-to-image foundation model. It delivers native high-resolution outputs, lightning-fast generation speeds, and industry-leading text-rendering capabilities, positioning it as a major competitor in AI-driven visual content creation.

Basic Information & Features

ByteDance’s Seedream 3.0 represents the latest milestone in text-to-image generation, combining high-resolution output, bilingual support, and accelerated inference in a single foundation model. Officially released in mid-April 2025, Seedream 3.0 builds upon its predecessor by addressing key challenges in prompt alignment, fine-grained typography, and visual fidelity, positioning itself as a formidable competitor in both academic and commercial arenas .

  • Bilingual Support: Natively understands both English and Chinese prompts, enabling accurate cross-lingual content generation.
  • High Resolution: Generates up to 2K (2048×2048 px) images without upscaling artifacts.
  • Fast Generation: A single 1K image is produced in as little as 3 seconds, with a 4-image batch in 8–10 seconds.
  • Superior Text Layout: Excels at embedding legible typography—titles, labels, signs—in images, handling both Chinese and English with aesthetic precision.

Technical Details

The technical pipeline of Seedream 3.0 encompasses three key strata:

  1. Data Construction: A defect-aware training paradigm doubles the dataset size, while a dual-axis collaborative sampling framework emphasizes both diversity and relevance.
  2. Pre-training Innovations: Incorporation of mixed-resolution training, cross-modality RoPE, and a novel representation alignment loss improves prompt–image correspondence under challenging contexts .
  3. Post-training Optimization: Seedream 3.0 employs diversified aesthetic captions during supervised fine-tuning (SFT) and leverages a VLM-based reward model to align outputs with human preferences, yielding images that better satisfy creative intent.

Moreover, the model pioneers an acceleration paradigm through consistent noise expectation and importance-aware timestep sampling, delivering a 4× to 8× speedup in inference while preserving image quality comparable to slower baselines.

Benchmark Performance

Seedream 3.0 delivers lightning-fast generation times—typically 3 seconds for a single 2K image and 8–10 seconds for a batch of four—making it one of the swiftest high-resolution models available. In independent evaluations, it ranks in the top tier alongside leading competitors such as GPT-4o for both speed and visual quality, particularly excelling in structural accuracy and text placement.

  • #1 in Industry Evaluations: Tied for first place on the Artificial Analysis Arena, outperforming Imagen-3, Reve Halfmoon, and Recraft in overall fidelity and structure.
  • Leading Scores: Tops EvalMuse, HPSv2, and MPS benchmarks for text–image alignment, composition, and aesthetic quality.
  • Real-World Testing: Consistent performance in both academic evaluations and commercial deployments on getimg.ai .

Limitations

  • Long-form Text: While short titles and labels render crisply, multi-line passages (e.g., fine print) may still exhibit letter jumbles .
  • Complex Layouts: Extremely intricate scene compositions (e.g., 50+ objects) can occasionally lead to occlusion artifacts.
  • Artistic Consistency: Some highly stylized prompts (e.g., cubism vs. photorealism) require manual prompt tuning to maintain coherence.

How to call Seedream 3.0 API from CometAPI

Seedream 3.0 API Pricing in CometAPI，20% off the official price:

ModelPrice
bytedance-image-generation
: bytedance-seedream-3.0-t2i		Price: $0.02400
bytedance-Image Editing
: bytedance-seedEdit-3.0-i2i		Price: $0.02400

Required Steps

  • Log in to cometapi.com. If you are not our user yet, please register first
  • Get the access credential API key of the interface. Click “Add Token” at the API token in the personal center, get the token key: sk-xxxxx and submit.
  • Get the url of this site: https://api.cometapi.com/

Use Method

  1. Select the “bytedance-seedEdit-3.0-i2i” / “bytedance-seedream-3.0-t2i” endpoint to send the API request and set the request body. The request method and request body are obtained from our website API doc. Our website also provides Apifox test for your convenience.
  2. Replace <YOUR_API_KEY> with your actual CometAPI key from your account.
  3. Insert your question or request into the content field—this is what the model will respond to.
  4. . Process the API response to get the generated answer.

CometAPI provides a fully compatible REST API—for seamless migration.The API provides OpenAI-compatible interfaces, allowing for seamless integration into existing workflows. Detailed documentation and usage guidelines are available on the ByteDance API page :

bytedance-image-generation:

  • Content-Type: application/json .
  • Base URL: https://api.cometapi.com/v1/images/generations
  • Model Names: bytedance-seedream-3.0-t2i
  • Authentication:  Bearer YOUR_CometAPI_API_KEY header

bytedance-Image Editing

  • Content-Type: application/json .
  • Base URL: https://api.cometapi.com/v1/images/edits
  • Model Names: “bytedance-seedEdit-3.0-i2i“
  • Authentication:  Bearer YOUR_CometAPI_API_KEY header

See Also

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