업데이트
What is SeeDream 4.5?
SeeDream 4.5 is the November 2025 mature checkpoint of ByteDance's 4.x image line. Use it when the same subject needs to appear across 30 images and look like the same subject every time. Reference-driven batches hold their character better than 4.0 or 4.1, and the dense-text rendering at 2K and above is the strongest in the family. Same parameter surface as 4.0 and 4.1: prompt, up to six references, eight aspect ratios from 1:1 through 21:9, resolutions at 2K (default) or 4K, optional seed, four images returned per call. If your work is brand campaigns, packaging, or character-driven content, 4.5 is the right tool. If you need vague-intent editing or PNG transparency support, look at SeeDream 5.0 Lite instead.
What's new in SeeDream 4.5
Strongest character consistency in the 4.x line
Same actor across 30 images keeps facial structure, outfit, and styling stable. Useful for serial content, storytelling, and any campaign that asks the model to hold a likeness for a sustained run.
Tighter dense-text rendering
Body copy at 2K and 4K stays legible. Useful for posters with paragraphs of copy, infographic callouts, packaging mocks, and anything where the typography reads at thumb size.
Cleaner 4K output for print delivery
Mature checkpoint produces fewer artifacts at 4K than earlier 4.x versions. Production-ready at large size without a retouch pass.
Precision edits via reference
Pass an existing image as reference and prompt for a specific change. Edits stay surgical instead of rewriting the whole frame, useful for product variants and headline swaps.
What SeeDream 4.5 is best for
Character-driven content
Same character across many images, holding facial structure and styling. Useful for serial content and storytelling.
Dense small-text rendering
Body copy at 2K stays legible. Useful for posters, infographics, and packaging mocks.
Brand-consistent campaigns
Six-image reference pack keeps palette, lighting, and subject locked across a campaign run.
Print delivery in 4K
Mature checkpoint produces fewer artifacts at 4K than earlier 4.x versions. Production-ready at large size.
Precision edits via reference
Pass the existing image as reference and prompt for a specific change. Edits stay surgical instead of rewriting the whole frame.
Stable production pipeline output
Predictable across many calls. Useful when downstream automation expects consistent input quality.
SeeDream 4.5 use cases
Run a serial character campaign by holding the same six references and seed across 30 calls. The actor reads as the same actor in every frame. Build a packaging mock with body copy at 2K and a press master at 4K from the same prompt, then deliver both without retouch on the type. Use precision-edit mode to swap the headline on an existing poster: pass the asset as a reference and prompt the change directly. Run brand campaign batches with palette and lighting locked across 100 calls; 4.5 holds steadier than 4.0 or 4.1 on long runs.
SeeDream 4.5 API examples
Call SeeDream 4.5 from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/image/bytedance/seedream-4.5.
curl -X POST https://api.unifically.com/v1/tasks \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "bytedance/seedream-4.5",
"input": {
"prompt": "A magical forest with glowing mushrooms and fireflies",
"resolution": "4k",
"aspect_ratio": "1:1"
}
}'
Successful submission returns a task_id. Poll GET /v1/tasks/<task_id> or set a callback_url on the request to receive the four finished images.
FAQ
SeeDream 4.5에 대해 자주 묻는 질문
SeeDream 4.5 is the most refined checkpoint in ByteDance's 4.x image line. Same controls as 4.0 and 4.1, with the strongest character consistency and dense-text rendering of the 4.x series. Strong choice for precision editing and brand-consistent batches.
4.5 trades a small amount of stylistic flexibility for noticeably better character consistency across reference-driven runs and tighter dense-text rendering. If your work involves the same subject across many images or includes readable body copy, 4.5 is a better fit.
4.5 is tuned for image quality. 5.0 Lite is tuned for intelligence (vague-intent editing, web search integration, transparent backgrounds via PNG input). Pick 4.5 for finished marketing assets, Lite for ecommerce and design-tool workflows.
Up to six per call.
2K and 4K. 4K is the practical pick for print and large-format display.
Yes. Pass seed for reproducible output.
There is no free tier. New UnificAlly accounts get a $0.50 signup balance, enough for 15 SeeDream 4.5 images at $0.032 each. After that, billing is pay-per-use with no subscription, and your balance never expires.