SeeDream 4.6
What is SeeDream 4.6?
SeeDream 4.6 is the December 2025 latest checkpoint in ByteDance's 4.x image line. The differences from 4.5 are subtle on typical prompts but show up on the hard ones: very dense compositions, unusual lighting setups, and mixed-script text all hold up better. The parameter surface is identical (prompt, up to six references, eight aspect ratios, 2K or 4K, optional seed, four images per call), so swapping is risk-free. If you author a wide variety of prompts and want the most resilient option, default to 4.6. If your prompt style is narrow and dialed in for 4.5, there is no urgent reason to switch.
What's new in SeeDream 4.6
Holds up on edge-case prompts
Dense compositions with six or more subjects, strong-backlit or mixed-source lighting, and stylized prompts all produce cleaner results than 4.5. Useful when the prompt mix is unpredictable.
Better mixed-script text
Posters or signage with two writing systems in the same frame stay legible. Useful for bilingual packaging and localized retail collateral.
Cleaner 4K edges for cropping
Larger canvas exports at 4K with fewer artifacts on the edges. Useful for hero banners that get cropped many ways across web, mobile, and print.
Drop-in upgrade from 4.5
Same parameters, same references, swap the model name. Existing 4.5 jobs adopt 4.6 with one line changed.
Best for
Edge-case prompts
Holds up on the dense, unusual, multi-element prompts that earlier 4.x versions occasionally distorted.
Mixed-script imagery
Better at posters or signage with two languages in the same frame.
Unusual lighting setups
Strong-backlit, mixed-source, and stylized lighting prompts produce cleaner results.
Wide-variety production
Most resilient 4.x checkpoint. Useful when your prompt mix is unpredictable.
Drop-in upgrade from 4.5
Same parameters, same references, swap the model name.
Hero art for cropping
Larger canvas exports at 4K with fewer artifacts on the edges. Good for banners that get cropped many ways.
Use cases
Default a mixed-prompt agency pipeline to 4.6 when the brief volume includes everything from product flat-lays to surreal editorial covers; the resilience pays off across the long tail. Build bilingual retail signage with English and a second script in the same frame, then render at 2K for digital and 4K for print without separate masters. Generate hero art that has to crop down to mobile, square, and ultra-wide; 4.6 keeps the edges clean enough to survive aggressive crops. Migrate an existing 4.5 batch by changing the model name and re-running the regression set on the harder prompts.
API examples
Call SeeDream 4.6 from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/image/bytedance/seedream-4.6.
curl -X POST https://api.unifically.com/v1/tasks \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "bytedance/seedream-4.6",
"input": {
"prompt": "A serene Japanese garden with cherry blossoms and a stone bridge",
"aspect_ratio": "4:3",
"resolution": "4k"
}
}'
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.
FAQs
People also ask
SeeDream 4.6 is the latest checkpoint of ByteDance's 4.x image line. Same parameter surface as 4.0, 4.1, and 4.5, with incremental refinements on edge cases (very dense compositions, unusual lighting, multilingual text).
4.6 holds up better on edge-case prompts that confused 4.5 (very dense compositions with 6+ subjects, unusual lighting setups, mixed-script text). For typical jobs the difference is small. For unusual jobs it can be the difference between shippable and not.
4.6 if you do a wide variety of work and want the most resilient option. 4.5 if your style is dialed in and you want maximum stability.
Up to six per call.
2K (default) or 4K.
