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Vendor: ByteDance Model ID: seedream-v4.5 Capability: 2048² · refined edges · CJK prompts · text-in-image Pricing: per image, refined tier (live rate) Seedream V4.5 is the right call when you need 2048² output with clean edges around text and packaging. V4 softens those edges; V5 lite produces them at the wrong scale. Reach for V4.5 specifically when your brief calls for typography that has to render correctly inside the image — product mockups, packaging stills, editorial layouts with inline copy.

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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-v4.5",
    "prompt": "Minimalist product packaging on a teal background, brand name LUMEN in serif type",
    "size": "2048x2048",
    "n": 1
  }'

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Body parameters

FieldTypeRequiredDefaultNotes
modelstringyes—seedream-v4.5
promptstringyes—CJK accepted natively.
sizestringno2048x2048Supported: 1024x1024, 2048x2048, 1024x2048, 2048x1024.
nintegerno11–4 images. Each billed separately.
seedintegerno—Reproducibility supported.
negative_promptstringno—Standard SD-style negation.

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Response

{
  "created": 1715174400,
  "data": [
    {
      "url": "https://cdn.bytespike.ai/img/...",
      "revised_prompt": "..."
    }
  ]
}
URLs pre-signed, valid 24 hours.

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Code examples

curl https://llm.bytespike.ai/v1/images/generations \
  -H "x-api-key: $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{"model": "seedream-v4.5", "prompt": "Product packaging mockup", "size": "2048x2048"}'

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Errors

CodeTriggerBilled?
400Body validation (size unsupported, prompt empty)No
401 / 402 / 403Auth / wallet / scopeNo
413Prompt too longNo
429Rate-limitedNo
451Prompt blocked by upstream safety filterNo
5xxUpstream issueNo (auto-retry)

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When to use

  • Packaging / product mockups where text edges matter.
  • Editorial stills with inline typography.
  • For 1024² aesthetic output, see Seedream V4.
  • For cheap iteration at lower resolution, see Seedream V5 lite.
  • For photorealism, see Nano-Banana Pro.

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Limits

LimitValue
Max output resolution2048×2048
Max images per call (n)4
Supports init image (img2img)No
Supports negative promptYes
Supports seed reproductionYes
Sync?Yes (≤30s typical)
Avg latency for 2048²12-18s