Bytedance Seedream V5.0 Lite Sequential API Documentation

Bytedance Seedream V5.0 Lite Sequential API Documentation

Playground

Seedream 5.0 Lite Sequential generates multi-image sets with consistent characters and objects, unifying palette, lighting, and style across all outputs. Supports up to 4K results for campaigns, storyboards, and product lines. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

Seedream V5.0 Lite Sequential creates a series of related images from a single text prompt. Describe individual scenes and a shared visual style for storyboards, creative concepts, and visual storytelling.

Why Choose This?

• Prompt-driven creation — Describe subjects, scenes, lighting, and style.
• Multi-image sequences — Request a series of related images in one run.
• High-resolution output — Generate images with up to 16,777,216 total pixels.
• Shared visual direction — Guide a sequence with common characters, settings, and style.

Parameters

How to Use

1. Set the image count — Choose max_images and state the same number in your prompt.
2. Write your prompt — Describe each image in order and specify a shared style.
3. Choose the output settings — Set size if needed, then choose JPEG or PNG.
4. Generate — Submit your request and download the results.

Pricing

Price = $0.035 × max_images. Billing is based on the selected max_images value, not the number of images ultimately returned.

Supported output sizes, output formats do not add separate charges.

Best Use Cases

• Storyboards — Explore a sequence of scenes for a project.
• Visual campaigns — Develop related images with a shared theme.
• Character concepts — Explore outfits, settings, and compositions.
• Social media series — Create images for multi-image posts.

Pro Tips

• Describe the main subject first, then add the setting, lighting, and style.
• Specify important colors, materials, and subject placement.
• Keep instructions clear and avoid conflicting descriptions.
• Separate scene descriptions with “First,” “Second,” and so on, while keeping shared details consistent.

Notes

• This endpoint does not accept reference images. Use Seedream V5.0 Lite Edit Sequential to work with existing images.
• If size is omitted, the default is 2048*2048.
• max_images is an upper limit, not a guarantee of the number of images returned. State the desired count clearly in your prompt.
• Custom sizes must contain between 3,686,400 and 16,777,216 total pixels, with a width-to-height ratio between 1:16 and 16:1. Both conditions must be met.
• Total pixels are calculated as width × height. Not every combination shown by the size controls meets these limits.
• Specify dimensions through size; separate width and height parameters are not supported.

Related Models

• Seedream V5.0 Lite Text-to-Image — Generate a single image from a text prompt.
• Seedream V5.0 Lite Edit — Edit images using text instructions.
• Seedream V5.0 Lite Edit Sequential — Create multiple images guided by reference pictures.

Authentication

For authentication details, please refer to the Authentication Guide.

API Endpoints

Submit Task & Query Result

set -euo pipefail

export WAVESPEED_API_KEY="your-api-key"

REQUEST_BODY=$(cat <<'JSON'
{
  "prompt": "A cinematic ocean wave at sunrise, highly detailed",
  "size": "2048*2048",
  "max_images": 1,
  "output_format": "jpeg"
}
JSON
)

# 1. Submit the prediction once. Never retry this request automatically:
# a retry after an unclear failure can create a second, billed task.
CHECK='The task may already exist. Check History or the predictions list before submitting again.'
if ! SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  --connect-timeout 10 --max-time 60 \
  -X POST "https://api.wavespeed.ai/api/v3/bytedance/seedream-v5.0-lite/sequential" \
  -H "Authorization: Bearer ${WAVESPEED_API_KEY}" \
  -H "Content-Type: application/json" \
  -d "${REQUEST_BODY}"); then
  printf 'Submit failed. %s\n' "${CHECK}" >&2
  exit 1
fi

TASK=$(printf '%s' "${SUBMIT_RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
PREDICTION_ID=$(printf '%s' "${TASK}" | jq -r '.id // empty')
if [ -z "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id. %s\n' "${CHECK}" >&2
  exit 1
fi
RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/${PREDICTION_ID}/result"

# 2. Poll until the prediction reaches a final status.
BODY_FILE=$(mktemp)
trap 'rm -f "${BODY_FILE}"' EXIT
while true; do
  # Transient errors (429, 5xx) are retried, honoring Retry-After.
  HTTP_CODE=$(curl --silent --show-error --fail-with-body \
    --connect-timeout 10 --max-time 60 --retry 5 --retry-delay 2 \
    --output "${BODY_FILE}" --write-out '%{http_code}' \
    "${RESULT_URL}" \
    -H "Authorization: Bearer ${WAVESPEED_API_KEY}" || true)
  case "${HTTP_CODE}" in
    2??) ;;
    000|429|5??)  # dropped connection or temporary error: keep polling
      printf 'Task %s: HTTP %s, polling again in 10s\n' "${PREDICTION_ID}" "${HTTP_CODE}" >&2
      sleep 10; continue ;;
    *) printf 'Task %s: HTTP %s\n' "${PREDICTION_ID}" "${HTTP_CODE}" >&2
      cat "${BODY_FILE}" >&2; exit 1 ;;
  esac
  RESULT=$(jq 'if type == "object" and has("data") then .data else . end' "${BODY_FILE}")
  STATUS=$(printf '%s' "${RESULT}" | jq -r '.status // empty')

  case "${STATUS}" in
    completed) printf '%s\n' "${RESULT}" | jq '.outputs'; break ;;
    failed|cancelled|timeout|deleted)
      printf 'Task %s ended with status %s\n' "${PREDICTION_ID}" "${STATUS}" >&2
      printf '%s\n' "${RESULT}" | jq . >&2; exit 1 ;;
    *) sleep 2 ;;
  esac
done

Parameters

Task Submission Parameters

Request Parameters

Every model also accepts the global request options enable_sync_mode and enable_base64_output; see their pages for details.

Response Parameters

Result Request Parameters

Result Response Parameters