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#

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.