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ByteDance’s flagship aesthetic image generator. Strong on illustration, packaging, and editorial stills with native CJK prompt understanding. Synchronous — no async polling needed. Slug: seedream-v4 · Capability: 1024² text-to-image · Pricing: $0.025 / image (live rate)

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Request

curl https://llm.bytespike.ai/v1/images/generations \
  -H "x-api-key: $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "seedream-v4",
    "prompt": "A koi pond at dusk, ink-wash style, soft purple sky",
    "size": "1024x1024",
    "n": 1
  }'

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Body

FieldTypeRequiredNotes
modelstringyesseedream-v4
promptstringyesText prompt. CJK accepted natively.
sizestringno1024x1024 (default), 1024x1536, 1536x1024
nintegerno1–4 images per call. Each image billed separately.
seedintegernoReproducibility.
negative_promptstringnoStandard SD-style negation.

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Response

{
  "created": 1715174400,
  "data": [
    {
      "url": "https://cdn.bytespike.ai/img/...",
      "revised_prompt": "..."
    }
  ]
}
Image URLs are pre-signed, valid for 24 hours. Download and rehost if you need long-term storage.

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When to use

Reach for Seedream v4 when:
  • Your prompt is in Chinese / Japanese / Korean
  • Aesthetic / illustrative style matters more than photorealism
  • You want predictable 1024² output without aspect-ratio gymnastics
For 2048² or refined edges, see Seedream V4.5. For lightweight / cheaper iteration, see Seedream V5lite. For photorealism at higher cost, see Nano-Banana Pro.