Official materials emphasize high-quality add/remove/replace edits, background swaps, and portrait retouching via text prompts while keeping the frame intact. For complex edits, work in steps and compare on iMini with 4.5.

Seedream 4.0 sits in one workspace with 4.5, 5.0 Pro, and GPT Image 2 — same prompt habits, side-by-side comparison. No vendor API key.

ByteDance Seed · Seedream 4.0 · September 9, 2025

Seedream 4.0 — One model for generation and editing

Q: Seedream 4.0 vs Seedream 4.5 — how to choose?

4.0 is the unified generate-and-edit baseline. 4.5 strengthens dense text, multi-image subject lock, and reference detail. Default to 4.5 for stable delivery and less drift in edits; use 4.0 to run the pipeline or compare legacy prompts.

Q: How does it compare to Seedream 5.0 Pro?

5.0 Pro is the design-native flagship: dense infographics plus click / lasso / brush interactive refinement. Start with 4.0 for editable drafts; step up to 5.0 Pro for point-and-fix and infographic flagship work.

Q: What resolution is supported?

Public messaging cites up to ~4K. Actual online limits depend on your product path.

Q: Can outputs be used commercially?

Follow iMini terms and your plan. Verify rights before paid ads or packaging.

Q: What styles is it good for?

Photoreal portraits, lifestyle stills, fashion collages, infographics, brand badges, and fantasy posters all appear in official demos. Specify medium and lighting in the prompt; skip vague adjectives.

Precise natural-language edits
Consistent portraits & scenes
Knowledge-grounded output
Up to ~4K

What is Seedream 4.0?

Seedream 4.0 is ByteDance Seed's next-generation image model, released September 9, 2025 — one architecture for text-to-image and general editing, with commonsense and reasoning built in. Official materials emphasize precise add/remove/replace edits, background swaps, and portrait retouching while keeping the frame intact; it's faster than the prior generation with output up to ~4K. It's the Seedream family's generate-and-edit baseline: step up to 4.5 for denser text and tighter edit consistency; use 5.0 Pro for interactive refinement and dense infographics. When subjects drift, layouts fall apart, or small type blurs, one bad frame can sink a campaign or lesson plan. 4.0's job is to get a workable, editable draft pipeline running first.

Developer

ByteDance Seed

Released

September 9, 2025

Resolution

Up to ~4K

Capabilities

Text-to-image + unified editing

Strengths

Knowledge reasoning · reference consistency

On iMini

Browser · free credits

Precise natural-language editing

Add, remove, replace, swap backgrounds, retouch portraits — change with prompts, not full rerolls. One drifted edit and an approved original is back to square one.

Stable portraits and identity

Canyon-west portrait shots need faces and wardrobe details that hold up zoomed in. One drifted face and the whole portrait set is scrap.

Knowledge and reasoning in images

Floor plans, infographic columns, design comparison boards — facts and hierarchy in one pass. One wrong arrow and the teaching page is unusable.

Style range and ~4K output

Fashion collages, brand badges, fantasy posters on one interface. Not enough resolution and print or large-screen delivery goes soft.

What the model actually delivers

Dream City poster, Galileo infographic, fashion collage, western portrait, bedroom still life, robot design board — official demo frames, not placeholder blur.

Compare with today's top models

Seedream 4.0 vs Seedream 4.5, Seedream 5.0 Pro, and GPT Image 2 — editing, portraits, text, design sense, refinement workflow, resolution, speed, and who should default to what.

Dimension	Seedream 4.0	Seedream 4.5	Seedream 5.0 Pro	GPT Image 2
Editing	High-fidelity edit + identity hold	High-fidelity edit + identity hold	Click · lasso · brush refinement	High-fidelity edit + identity hold
Portraits	Short copy readable · localization	Short copy readable · localization	Short copy readable · localization	Short copy readable · localization
In-image text	Short copy usable	Short copy readable · localization	High-density layout text	Short copy readable · localization
Design sense	Strong	Strong layout capability	Best design sense	Short copy readable · localization
Refinement workflow	Natural-language edits / variants	Natural-language edits / variants	Click · lasso · brush refinement	High-fidelity edit + identity hold
Resolution	Up to ~4K	Up to ~4K	Up to ~4K	Native 4K (3840×2160)
Speed profile	Faster reasoning-to-image	Quality-first channel	Quality-first channel	Faster reasoning-to-image
Default pick	Generate+edit baseline default	Stronger design & text default	Design-native flagship · interactive refine	OpenAI default for new projects

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Where Seedream 4.0 shines

Natural-language editing, stable portraits, knowledge-grounded layout, style range, ~4K output, scene coherence.

Precise editing

Add, remove, replace, and swap backgrounds via prompts. Change one spot and the whole body drifts — approved art means rerolling the set.

Portrait delivery

Photoreal faces and wardrobe details stay put. One drifted face and the portrait series is scrap.

Still life and space

Bedroom stills, annotated floor plans — materials and labels must hold up on review. One wrong label layer and the spec sheet is dead.

Style range

Fashion collages, badges, fantasy posters on one interface. One off-style frame and the brand board stops lining up.

In-image text and infographics

Infographic columns and poster headlines stay readable. One blurred line and the lesson or ad mock is scrap.

Complex composites and comparison boards

Multi-panel spec sheets and version comparisons in one frame. Messy panels and the pitch won't pass review.

One model, eight production workflows

From precise annotations to poster comparisons, portraits to design boards — mapped to official demos. Work that used to mean a day of layout or retouching now starts as a reviewable prompt draft.

Floor plans and local rewrites

Annotated floor plans with arrows pointing to elements. One wrong arrow and construction comms break down.

Photoreal portrait delivery

Western canyon portrait — face and wardrobe must hold up zoomed in. One drifted face and the set is scrap.

Bedroom and lifestyle stills

Morning bedside alarm showing 07:30, vase and bedding. Blurred digits and the still life isn't credible.

Fashion styling collages

Dunes, motorcycle, gown, and silver accessories on one board. Mismatched styles and the pitch board is dead.

Fantasy city posters

Dream City poster with bilingual headlines. Blurred titles or loose composition and the KV can't ship.

Landscape title key visuals

Brand headline over green hills. Type fighting the landscape and the hero won't lock.

Brand badges and marks

GREEN mountain badge — graphic and type locked in frame. One broken letter and the whole asset set redoes.

Product design comparison boards

Delivery robot from sketch to color render plus spec table. Messy panels and reviewers can't follow the iteration.

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Teams that need a generate+edit baseline

When deliverables still need edits and reasoned layout, the gap shows up in prompt-level fixes, portrait drift, and whether to step up to 4.5 / 5.0 Pro — these teams default to Seedream 4.0 first.

E-commerce and brand teams

Hero variants and identity assets. Reshooting every market once kills the schedule.

Designers and art directors

Infographics and design boards as discussable first passes. Lock direction, then step up to 4.5 or 5.0 Pro.

Marketing and growth

Poster and KV drafts. Broken type often kills the whole comp — readability comes first.

Creators and educators

Column explainer graphics and series covers. One wrong annotation layer and the page isn't trustworthy.

Agencies and production shops

Client changes one element — keep subject and lighting as intact as possible and skip a full rebuild round.

Commercial photo and retouch

Natural-language rewrites on approved photos. Lost reference detail breaks the retouch chain.

Three steps to run Seedream 4.0

Step 1

Open the Seedream 4.0 entry

Select Seedream 4.0 in the iMini image workspace — same account as 4.5 and 5.0 Pro.

Step 2

Write prompts around the deliverable

State generate vs edit, text that must stay readable, and references to lock.

Step 3

Generate, edit, compare, and step up

Download what works, or compare side by side with Seedream 4.5 / 5.0 Pro and GPT Image 2 before stepping up.

Four ready-to-use prompts

Close to official demos. Hover for full text, copy in one click, run on iMini; Chinese prompts supported.

Infographic

Create a "Galileo Free-Fall Experiment Explained" infographic in blue and white. Columns: experiment background, method, conclusion, historical significance. Clear headings; conclusion states fall speed is independent of weight, g≈9.8m/s².

Portrait

Photoreal western canyon portrait: young woman in wide-brim hat and brown neck scarf, single braid over shoulder, red rock cliffs and clear sky behind, golden-hour side light, clear skin and fabric detail, cinematic framing.

Still life

Morning bedroom still life: pale pink roses and silver alarm clock showing 07:30 on white nightstand, sheer curtains casting light on wood floor and carved headboard, lifestyle magazine photography style.

Collage

White-background fashion collage board: dune aerial, futuristic silver-white motorcycle, silver parachute, full-body white structural gown, geometric silver bracelet, silver clutch, vintage gold binoculars — minimalist haute couture collage.

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