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What is SeeDream 5.0 Flash?
SeeDream 5.0 Flash is the fast, low-cost image model in ByteDance's 5.0 line, released in September 2026 as the quicker sibling of SeeDream 5.0 Pro. It does two jobs on one route: text-to-image, and image editing with up to 10 reference images.
The request is the same as Pro's. A prompt, optional references, one of eight aspect ratios from 1:1 to 21:9, and output at 1K, 1.5K, or 2K in png or jpeg. One image comes back per call, usually in about 20 to 30 seconds.
ByteDance aims Flash at work where latency and cost per image decide the choice, and keeps Pro for the highest image quality. That split holds up in practice. Use Flash for volume and quick turnaround, and Pro for the single image that has to be right.
Key features of SeeDream 5.0 Flash
An image in about 20 to 30 seconds
A typical request on our API finishes in 20 to 30 seconds, text-to-image or edit. That is short enough to sit behind a user-facing button, and it makes large batches finish in minutes instead of hours.
One flat rate at every resolution
A 2K image costs the same as a 1K image, and reference images add no extra charge. You can budget by counting requests, with no size or input math.
Editing with up to 10 reference images
Send up to 10 images in image_urls and describe the change: swap a product, restyle a photo, or merge several subjects into one scene. Leave the field out and the same route does plain text-to-image.
Layouts and text that stay readable
Flash is tuned for graphic work as well as photos. Posters, banners, and thumbnails come out with clean layouts and headline text you can read.
Eight aspect ratios, 1K to 2K
Pick 1K, 1.5K, or 2K and a ratio from 1:1 to 21:9. The two set the pixel size together: 2K at 16:9 renders 2624x1472, 1.5K at 16:9 renders 1968x1104, and 1K at 1:1 renders 1024x1024.
What SeeDream 5.0 Flash can do
Headlines and price lists spelled right
A hand-painted poster in a rainy bakery window: a three-line headline and four priced items. Every word and price matches the prompt, and the paper sits behind real raindrops on the glass.
Bright, clean color for graphic work
Five fruit sodas in a row on a turquoise table, each its own saturated color with its own handwritten label. The colors stay separate, the labels match their drinks, and the hard noon shadows all fall the same way.
Wide banners at the same flat price
A 21:9 night market at 3072x1312: a vendor passing skewers over the grill, steam, lanterns and a crowd running off into the distance. A wide 2K frame like this costs the same as a 1K square.
What SeeDream 5.0 Flash is best for
High-volume image batches
Catalog shots, ad variations, and thumbnails by the thousand, where the flat per-image rate keeps the bill easy to predict.
User-facing image features
In-app generators and editors where people wait on the result. A 20 to 30 second turnaround keeps them on the page.
Drafts before a final render
Try five directions on Flash, then send the winner to SeeDream 5.0 Pro with the same request body.
Social and ad visuals
Posts, banners, and thumbnails with a headline in the image, in square, vertical, or wide formats.
Quick product edits
Background swaps, restyles, and multi-image composites from up to 10 references.
SeeDream 5.0 Flash use cases
Build an ad-variation tool that takes one product photo and a list of headlines, and returns a set of banners in 16:9, 1:1, and 9:16 from parallel requests. Add an edit button to a storefront so merchants can restyle a product shot from a short instruction and see the result in under half a minute. Run a nightly job that fills a catalog with thumbnails at 1K, then re-renders only the best sellers at 2K for the same rate. Or put Flash in front of Pro: let users explore on Flash and spend the slower, pricier render on the one image they pick.
SeeDream 5.0 Flash limitations
Flash trades some image quality for speed. Pro is still better at photorealism and fine material detail, such as skin, fabric, and metal seen at full size. Output stops at 2K, with no 4K option. Each request returns one image: there is no sequential set mode and no web search, and extra fields in the request are rejected. Transparent backgrounds and layer separation are not available on this route.
When to use SeeDream 5.0 Flash
Use Flash when speed or cost per image decides the job: batches, drafts, live product features, and social or ad visuals. Move to SeeDream 5.0 Pro when one image has to hold up to close inspection. The two share a request shape, so switching is a change of model name. Use SeeDream 5.0 Lite when you need sequential sets or web-search references.
SeeDream 5.0 Flash API examples
Call SeeDream 5.0 Flash from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/image/bytedance/seedream-5.0-flash.
curl -X POST https://api.unifically.com/v1/tasks \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "bytedance/seedream-5.0-flash",
"input": {
"prompt": "A ripe red apple on a wooden table, soft window light",
"aspect_ratio": "16:9",
"resolution": "2K"
}
}'
Successful submission returns a task_id. Poll GET /v1/tasks/<task_id> or set a callback_url on the request to receive the finished image.
FAQs
People also ask about SeeDream 5.0 Flash
SeeDream 5.0 Flash is the fast, low-cost image model in ByteDance's 5.0 line, released in September 2026. It generates images from a text prompt and edits images you send as references, on the same route. It is built for work where turnaround and cost per image matter most.
A typical request finishes in about 20 to 30 seconds, measured on the UnificAlly API. Text-to-image sits at the low end, and requests with many reference images take a little longer.
Both take the same request, up to 10 reference images, the same eight aspect ratios, and 1K, 1.5K, or 2K output. Flash returns the image sooner and costs less. Pro takes longer and holds up better on photorealism and fine material detail, so it suits the final render.
$0.0162 per image at every resolution, so 2K costs the same as 1K. Reference images add no extra charge. Billing is per finished image with no subscription.
Three resolution options, 1K, 1.5K, and 2K (the default), across eight aspect ratios, 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, and 21:9. The two combine into the final pixel size, so 2K at 16:9 renders 2624x1472 and 1K at 1:1 renders 1024x1024.
Up to 10 per request, sent as public https URLs in image_urls. Leave the field out for plain text-to-image.
No. Each request returns exactly one image, as png (the default) or jpeg. To get several options, send several requests in parallel.