Seedance 1.5 Pro - MixRoute API

Seedance 1.5 Pro is a ByteDance video model. Use the complete route ID seedance-1-5-pro-251215; the version suffix is part of the ID. Full field definitions: Seedance API.

Model Parameters and Limits

Setting	Value
`model`	`seedance-1-5-pro-251215`
Input modes	Text, first-frame image, or first/last-frame images.
`metadata.content`	Required input array. Include a text item for text-only generation and keep it consistent with prompt.
`metadata.duration`	4-12 / -1 seconds; -1 selects duration automatically.
`metadata.resolution`	`480p`, `720p`, `1080p`; default 720p.
`metadata.ratio`	`21:9`, `16:9`, `4:3`, `1:1`, `3:4`, `9:16`, `adaptive`
Audio	`metadata.generate_audio` defaults to true; false produces silent video.
Format	`mp4`
Frame rate	24 fps

Keep model, prompt, and asset at the root; every provider field belongs in metadata. Set asset=true for the media-input examples.
Frame roles and reference_* roles are separate input modes; do not combine them.
This legacy version does not accept video/audio references or reference_image inputs. Use only the frame-input modes listed above; confirm account access before calling its model ID.
The default ratio is adaptive; supported concrete ratios may also be selected.

Examples

Set MIXROUTE_API_KEY and replace image/video/audio placeholders with accessible source media before calling.

Text-to-Video

curl --request POST "https://api.mixroute.ai/v1/video/generations" \
  --header "Authorization: Bearer $MIXROUTE_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "seedance-1-5-pro-251215",
  "prompt": "A ceramic mug slowly rotates on a white tabletop in soft daylight.",
  "asset": false,
  "metadata": {
    "content": [
      {
        "type": "text",
        "text": "A ceramic mug slowly rotates on a white tabletop in soft daylight."
      }
    ],
    "duration": 4,
    "resolution": "480p",
    "ratio": "1:1",
    "generate_audio": false,
    "watermark": false
  }
}'

Python

import json
import os
import requests

payload = json.loads(r'''
{
  "model": "seedance-1-5-pro-251215",
  "prompt": "A ceramic mug slowly rotates on a white tabletop in soft daylight.",
  "asset": false,
  "metadata": {
    "content": [
      {
        "type": "text",
        "text": "A ceramic mug slowly rotates on a white tabletop in soft daylight."
      }
    ],
    "duration": 4,
    "resolution": "480p",
    "ratio": "1:1",
    "generate_audio": false,
    "watermark": false
  }
}
''')
response = requests.post(
    "https://api.mixroute.ai/v1/video/generations",
    headers={"Authorization": "Bearer " + os.environ["MIXROUTE_API_KEY"]},
    json=payload,
    timeout=60,
)
response.raise_for_status()
result = response.json()
if result.get("code") not in (None, 0, 200, "0", "200", "success"):
    raise RuntimeError(result.get("message") or result)
print(result)

First-Frame Image

curl --request POST "https://api.mixroute.ai/v1/video/generations" \
  --header "Authorization: Bearer $MIXROUTE_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "seedance-1-5-pro-251215",
  "prompt": "A ceramic mug slowly rotates on a white tabletop in soft daylight.",
  "asset": true,
  "metadata": {
    "content": [
      {
        "type": "text",
        "text": "A ceramic mug slowly rotates on a white tabletop in soft daylight."
      },
      {
        "type": "image_url",
        "image_url": {
          "url": "https://example.com/first-frame.png"
        },
        "role": "first_frame"
      }
    ],
    "duration": 4,
    "resolution": "480p",
    "ratio": "adaptive",
    "generate_audio": false,
    "watermark": false
  }
}'

Task Result

Retain the submitted MixRoute task ID and use Query Video Task. Read the video URL only after a successful terminal status; submission does not mean generation is complete.