imagesarrayrequired
The URLs of the images to use for image-to-image generation or image editing.
Seedream 4.5 Edit
bytedance/seedream/4.5/editA new-generation image creation model from ByteDance, Seedream 4.5 integrates text-to-image generation and image editing into a single unified architecture, delivering high-fidelity visuals, precise prompt control, and seamless creative workflows for professional AIGC applications.
Try the model
Playground
Input
PNG, JPEG, WebP, or GIF · 20 MiB maximum each
The URLs of the images to use for image-to-image generation or image editing.
The text prompt to generate an image from.
Additional Settings More
Customize your input with more control.
Size(string)
The aspect ratio of the generated image. Allowed values: 21:9, 16:9, 3:2, 4:3, 1:1, 3:4, 2:3, 9:16.
The format of the generated image. Allowed values: jpeg, png.
ResultIdle
Your output will appear here
Complete the inputs, then click Run.
Human preference
Arena
Elo ratings from blind side-by-side votes, compared with other image and video models.
Rankings sourced from Artificial Analysis Arena
- Leaderboard
- Image Editing
- Rank
- #40 of 77
- Elo
- 1043 ±13
- Gap to #1
- −156
Image-editing arena: people pick the better of two edits of the same image and instruction, without seeing the model names.
- #35Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)1054±12
- #36Wan 2.7 Pro1050±13
- #37DreamImage 2.01048±13
- #38Wan 2.6 Image1044±13
- #39Luma UNI 11043±13
- #40Seedream 4.51043±13
- #41Wan 2.71042±13
- #42HunyuanImage 3.0 (Tencent Cloud)1029±16
- #43FLUX.2 [dev] Turbo1019±18
- #44FLUX.2 [klein] 9B1015±13
Seedream 4.5 Edit
Seedream 4.5 edit: instruction-based edits and multi-image composition with consistent identity and typography.
Fields
| Field | Type | Default | Notes |
|---|---|---|---|
images | image URL[], required | — | Images to edit or combine, Image 1, Image 2, … |
prompt | string, required | — | Up to 50,000 characters. |
aspect_ratio | 21:9 / 16:9 / 3:2 / 4:3 / 1:1 / 3:4 / 2:3 / 9:16 | — | Omit to follow the first input image. |
image_size | object | — | Optional explicit output size; overrides aspect_ratio. |
output_format | jpeg / png | png | Output file format. |
Billing
$0.04 per output image.
| Request | Price |
|---|---|
| One image | $0.04 |
Failed runs are not charged.
Prompting
- Say which image is the base and what each other image contributes.
- List what must not change.
Limits
- One output image per request.
Also on SandBase
Other Seedream endpoints: bytedance/seedream/5.0/pro, bytedance/seedream/5.0/pro/edit, bytedance/seedream/5.0/lite, bytedance/seedream/5.0/lite/edit, bytedance/seedream/5.0/flash, bytedance/seedream/5.0/flash/edit, bytedance/seedream/4.5.
Start building
Send your first request
Submit this model through the SandBase Unified Run API.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/run" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "bytedance/seedream/4.5/edit",
"images": [
"https://p9-arcosite.byteimg.com/tos-cn-i-goo7wpa0wc/4b4464161cf3463db6f9463b10939178~tplv-goo7wpa0wc-image.image",
"https://p9-arcosite.byteimg.com/tos-cn-i-goo7wpa0wc/c23d1b0528a14cb08b684307eabdcc9b~tplv-goo7wpa0wc-image.image"
],
"prompt": "Replace the clothing in image 1 with the outfit from image 2.",
"output_format": "png"
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
status=$(printf '%s' "$result" | jq -r .status)
case "$status" in completed|failed|timeout) break ;; esac
sleep 2
result=$(curl --fail-with-body --silent \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
"https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"2. Authentication
Create a SandBase API key and set it in your server environment. All requests use Bearer authentication.
export SANDBASE_API_KEY="YOUR_API_KEY"Keep the key on your server. Do not expose it in browser code or commit it to a repository.
3. Queue
Submit a request
POST to /v1/run with this model ID and its inputs. The request example above includes submission and polling.
Fetch request status and result
Use the returned run ID to poll until the status is completed, failed or timeout. Read output only after completed.
curl "https://api.sandbase.ai/v1/run/$RUN_ID" \
-H "Authorization: Bearer $SANDBASE_API_KEY"4. Files
Hosted files
Pass a publicly accessible file URL in the model’s image, video or audio field. Supported formats and limits are shown beside each Playground input.
Uploading images
Use the upload or replace control on supported image fields in the Playground. Video URL fields accept a hosted driving video; they do not imply video-upload support.
5. Schema
Input
promptstringrequired
The text prompt to generate an image from.
Default: "Replace the clothing in image 1 with the outfit from image 2."
image_sizeobject
aspect_ratiostring
The aspect ratio of the generated image.
Possible values: "21:9", "16:9", "3:2", "4:3", "1:1", "3:4", "2:3", "9:16"
output_formatstring
The format of the generated image.
Default: "png"
Possible values: "jpeg", "png"
{
"model": "bytedance/seedream/4.5/edit",
"images": [
"https://p9-arcosite.byteimg.com/tos-cn-i-goo7wpa0wc/4b4464161cf3463db6f9463b10939178~tplv-goo7wpa0wc-image.image",
"https://p9-arcosite.byteimg.com/tos-cn-i-goo7wpa0wc/c23d1b0528a14cb08b684307eabdcc9b~tplv-goo7wpa0wc-image.image"
],
"prompt": "Replace the clothing in image 1 with the outfit from image 2.",
"output_format": "png"
}Output
A completed run exposes its result in output. The following is the model’s saved example, not a new generation.
No example output has been published yet. Use Playground → Result → JSON after a completed run to inspect your response.