Seedream 5.0 Pro

Quick example

curl https://reapi.ai/api/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seedream-5-0-pro",
    "prompt": "a scarlet macaw on a mossy branch, cinematic god rays, magazine cover titled WILD BEAUTY",
    "aspect_ratio": "16:9",
    "quality": "high"
  }'

import requests

resp = requests.post(
    "https://reapi.ai/api/v1/images/generations",
    headers={
        "Authorization": "Bearer YOUR_API_KEY",
        "Content-Type": "application/json",
    },
    json={
        "model": "doubao-seedream-5-0-pro",
        "prompt": "a scarlet macaw on a mossy branch, cinematic god rays",
        "aspect_ratio": "16:9",
        "quality": "high",
    },
    timeout=30,
)
print(resp.json())

const r = await fetch("https://reapi.ai/api/v1/images/generations", {
  method: "POST",
  headers: {
    Authorization: "Bearer YOUR_API_KEY",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    model: "doubao-seedream-5-0-pro",
    prompt: "a scarlet macaw on a mossy branch, cinematic god rays",
    aspect_ratio: "16:9",
    quality: "high",
  }),
});
console.log(await r.json());

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "io"
    "net/http"
)

func main() {
    body, _ := json.Marshal(map[string]any{
        "model":  "doubao-seedream-5-0-pro",
        "prompt":       "a scarlet macaw on a mossy branch, cinematic god rays",
        "aspect_ratio": "16:9",
        "quality":      "high",
    })
    req, _ := http.NewRequest("POST",
        "https://reapi.ai/api/v1/images/generations", bytes.NewReader(body))
    req.Header.Set("Authorization", "Bearer YOUR_API_KEY")
    req.Header.Set("Content-Type", "application/json")

    resp, _ := http.DefaultClient.Do(req)
    defer resp.Body.Close()
    out, _ := io.ReadAll(resp.Body)
    fmt.Println(string(out))
}

Submit response

{
  "id": "task_018f5a3a1b6e7d9f8c2b4d6e8f0a2c4e",
  "model": "doubao-seedream-5-0-pro",
  "status": "processing",
  "created_at": 1735000000
}

Poll GET /api/v1/tasks/{id} (see the Tasks reference) until status === "completed". The completed payload's output.image_urls holds the generated image URL, valid for 72 hours. Mirror to your own storage if you need it longer.

Authentication

Every call needs a Bearer token. Generate keys at reapi.ai/settings/apikeys.

Authorization: Bearer YOUR_API_KEY

Keys carry the active workspace's billing scope — there is no separate project header.

Endpoint

POST /api/v1/images/generations
GET  /api/v1/tasks/{id}

Submission is async. The POST returns immediately with a task_id; the task endpoint returns the same envelope until completion. Polling does not consume credits.

Request body

model — required

string. Must be doubao-seedream-5-0-pro exactly.

prompt — string, required

Up to 4,000 characters. Free-form text describing the image. Detailed prompts that name the subject, composition, lighting, and style consistently produce better results. Seedream 5.0 Pro renders in-image text well — put headline or logo copy directly in the prompt.

aspect_ratio — string, required

Output aspect ratio. Accepted values:

• 1:1
• 4:3
• 3:4
• 16:9
• 9:16
• 2:3
• 3:2

quality — string, required

Output resolution tier:

• basic — 1K output
• high — 2K output

Seedream 5.0 Pro does not expose a 4K tier.

image_urls — array, optional

Reference images for image-to-image (1 image) or multi-reference fusion (up to 10 images). Public HTTP(S) URLs only — base64 / data: URIs are rejected at the gateway.

Upload to your own R2 / S3 / OSS / equivalent first, then pass the public URL.

nsfw_checker — boolean, optional

Controls the primary channel's configurable NSFW checker. Omit the field to use the default behavior. Because no fallback channel exposes an equivalent control, an explicitly supplied value — either true or false — makes the request single-channel and disables automatic provider fallback.

Pricing

Seedream 5.0 Pro charges the official per-output-image rate, banded by quality — the high/2K band costs more than basic/1K. For reference-image requests, the first input image is included and each additional input image (2nd through 10th) adds the official ¥0.02 reference surcharge (converted at the configured 6.8 RMB/USD rate). Images blocked by moderation are refunded automatically.

credits = ceil((output_price_usd + additional_reference_price_usd) × 1000)

where 1 credit = $0.001. The exact per-image credit cost surfaces on the model page and reflects the current rate. There is no per-token or subscription component.

Response

The poll envelope returns the image URL in output.image_urls:

{
  "id": "task_019dfd44b7fd74168541552a3260a623",
  "model": "doubao-seedream-5-0-pro",
  "status": "completed",
  "output": {
    "image_urls": [
      "https://cdn.reapi.ai/...jpg"
    ]
  }
}

URLs are valid for 72 hours. Mirror to your own storage for longer retention.

Errors

Failures use the standard envelope { error: { code, message, request_id } }. See the errors catalog for the full code list. Common cases:

• Invalid parameters (bad aspect_ratio / quality, oversize image_urls) → 4xx invalid-input.
• A prompt or reference blocked by moderation → content-policy error; the task is refunded.

Tips

• Choose aspect_ratio explicitly instead of relying on ratio wording in the prompt.
• Multi-reference fusion keeps a character consistent — pass the same face / wardrobe references across a series.
• Lean on Seedream 5.0 Pro's text rendering for posters, covers, and UI mockups; spell the exact words you want in quotes inside the prompt.

Related

• Seedream 5.0 Lite — the lean, lower-cost tier
• Tasks reference
• Errors catalog