NOV 9, 2026

Table of contents

  1. Seedream 5.5 at 1.5K
  2. Transparent background
  3. Also new

Seedream 5.5 and transparent backgrounds

November 9, 2026

Dreamina added ByteDance’s Seedream 5.5 to Canadian accounts, and the Dreamina API supports it now on POST /images:

  • model: "seedream-5.5" makes 4 images per request at 1.5K (default) or 2K, from text and up to 6 reference images, and picks the aspect ratio for you when you don’t set one
  • On a Canadian account it uses 8 credits an image at 1.5K and 13 at 2K (launch price, normally 11 and 18)
  • The new background parameter takes auto (default), opaque or transparent. With transparent you get PNG images with a transparent background. It works with seedream-5.5, gpt-image-2, gpt-image-2.5-flare and gpt-image-2.5-sunburst

Below are the real outputs of our test round, all made through the API on a Canadian account.

Seedream 5.5 at 1.5K

One request, four images of 1536×1536, ready in 23 seconds.

Seedream 5.5 in the Dreamina API: four 1.5K images of a red vintage bicycle against a white brick wall

curl — POST /images 
curl --location 'https://api.useapi.net/v1/dreamina/images' \
--header 'Authorization: Bearer user:12345-…' \
--form 'model="seedream-5.5"' \
--form 'resolution="1.5k"' \
--form 'ratio="1:1"' \
--form 'prompt="a red vintage bicycle leaning on a white brick wall, soft morning light, photo"'

Transparent background

The same prompt with background: "transparent". Seedream 5.5 returned four PNGs with an alpha channel, shown here on a checkerboard so you can see what is transparent. Because the prompt describes a scene, Seedream kept part of the wall in three of them and the whole scene in the fourth.

Seedream 5.5 with background transparent: four PNG images on a checkerboard, the wall partly kept

curl 
curl --location 'https://api.useapi.net/v1/dreamina/images' \
--header 'Authorization: Bearer user:12345-…' \
--form 'model="seedream-5.5"' \
--form 'resolution="1.5k"' \
--form 'ratio="1:1"' \
--form 'background="transparent"' \
--form 'prompt="a red vintage bicycle leaning on a white brick wall, soft morning light, photo"'

GPT Image 2.5 Flare, given the same prompt and background: "transparent", dropped the wall and returned a clean cutout of the bicycle alone, one 1328×1328 PNG in 33 seconds for 5 credits. Download the original PNG.

GPT Image 2.5 Flare with background transparent: a red bicycle cut out on a checkerboard

curl 
curl --location 'https://api.useapi.net/v1/dreamina/images' \
--header 'Authorization: Bearer user:12345-…' \
--form 'model="gpt-image-2.5-flare"' \
--form 'resolution="1k"' \
--form 'ratio="1:1"' \
--form 'background="transparent"' \
--form 'prompt="a red vintage bicycle leaning on a white brick wall, soft morning light, photo"'

For stickers, product shots and logos, describe the object on its own (“a red vintage bicycle, isolated”) rather than a scene, and both models have less background to decide about.

Also new

  • US accounts now run Seedream 5.0 Pro (seedream-5.0-pro, 2K or 4K) and Seedream 5.0 Flash (seedream-5.0-flash, 1.5K, 2K or 4K, 6 credits an image up to 2K). Flash replaced Seedream 5.0 Lite on US, which stays on Canadian accounts
  • Canadian accounts get Seedream 3.1 (seedream-3.1, text only, 1K or 2K)
  • Dreamina dropped Nano Banana and Seedance 1.5 Pro from Canadian accounts. Seedance 1.5 Pro still runs on US accounts

Full parameter reference: POST /images. Credits per image for every model: Setup Dreamina.