Seedream 5.5 vs 5.0 Pro vs Flash vs Lite vs 4.5 vs 4.0: Which Seedream Model to Use in 2026

Key Takeaways

• Seedream 5.5 is ByteDance's newest Seedream, released in November 2026 and tuned for realistic photos, small text and long runs of edits. ByteDance's tests rate it above 5.0 Pro, and on Mage it renders at 1K or 2K for 24 or 42 Gems, plus 9.6 for each input image.

• Seedream 5.0 Pro is the 5.0 flagship, with a Prompt Optimizer you can set to Fast or Off, and the model Mage's agent and API use for Seedream by default. On Mage it renders at 1K or 2K, from 68 Gems an image.

• Seedream 5.0 Flash is the fast, low-cost version of 5.0: 27 Gems an image at 1K or 2K, with the same multilingual text rendering, so it's the model for drafts and high-volume sets.

• Seedream 4.5 is the pick when you need 4K. It renders at 2K, 3K or 4K, and on Mage it's the Seedream model that works with Moodboards.

• Seedream 5.0 Lite sits in the middle at 2K or 3K, and Seedream 4.0 is the older all-rounder that covers 1K to 4K for 45 Gems.

• On Mage, every Seedream model is unlimited on the Pro plan at up to 2K, and 3K and 4K are unlimited on Pro Plus.

What Is Seedream?

Seedream is ByteDance's family of image generation and editing models, made by its Seed research team. One Seedream model both creates images from a text prompt and edits images you upload, so the same prompt box handles a new poster, a product shot on a new background, or a different outfit on the person in a portrait.

ByteDance has shipped Seedream in quick generations. Seedream 4.0 made the family popular in 2025, Seedream 4.5 followed in December 2025 with sharper detail and better small text, and the 5.0 generation arrived through 2026: Lite first, then Pro as the new flagship and Flash as its fast version. Seedream 5.5 followed in November 2026, and ByteDance says a Pro version of 5.5 will come later.

You can run all six on Mage, in the browser, under one account. Below, we compare them on what changes your result: image quality, text, resolution, edits, speed and price.

The Six Seedream Models at a Glance

Every model takes up to 10 input images per run and renders in 9 aspect ratios, from 21:9 to 9:21.

How Do the Seedream Models Differ?

Image quality and prompt following

Seedream 5.5 is the most realistic model in the family. ByteDance says it renders light, materials and skin more naturally, with less of the gloss and overexposure earlier models could show, and in ByteDance's own production tests it scored higher than 5.0 Pro on quality and usability in all six use cases it measured, from e-commerce to film and fashion.

Among the 5.0 models, Seedream 5.0 Pro follows long, detailed prompts most closely. When a prompt lists a dozen objects, each in its place, Pro keeps the most of them. Seedream 5.0 Lite and 4.5 are close behind for single-subject images, and Seedream 4.0 is the most likely to drop a detail from a crowded scene.

Text inside the image

Text is where the 5.0 generation pulls ahead. ByteDance says Seedream 5.0 Pro and Flash render text in Chinese, English and 14 more languages, including Spanish, French, German, Japanese, Korean, Arabic and Thai. Seedream 5.5 goes further on dense small text: ByteDance measured severe text errors in 0.4% of its images and minor ones in 1.7%, and says it leads GPT Image 2.5 Sunburst and Nano Banana 2.1 on text structure. Seedream 4.5 improved small text over 4.0, so it's a good fallback when you need a big poster at 4K with a short title.

Resolution

Resolution splits the family in two. Seedream 5.5, 5.0 Pro and 5.0 Flash render at 1K or 2K on Mage, and 5.0 Lite at 2K or 3K. For 4K, use Seedream 4.5 or Seedream 4.0. If a 5.5 or 5.0 image is the one you love, you can also sharpen it to a larger size with Mage's Image Enhancer.

Edits and reference images

Every Seedream model can edit an image you upload: add an object, remove one, replace a subject or change a style. Seedream 5.5 is built for long editing sessions: ByteDance trained it to keep the parts you didn't ask to change exactly as they were, and showed 100 edits in a row on one image. The 5.5 and 5.0 models handle edits that merge several images, such as putting the product from one photo into the scene from another. On Mage, the 5.5, 5.0 and 4.5 models also take saved Characters and References, so the same face, outfit or product carries across a whole set.

Speed and price

Seedream 5.0 Flash costs a flat 27 Gems an image, input images included, and returns images in well under half the time 5.0 Pro takes. Seedream 5.0 Pro takes the longest, because it does the most work on each prompt, and costs 68 Gems at 1K or 135 Gems at 2K, plus 4.5 Gems for each input image after the first. Seedream 5.5 costs 24 Gems at 1K or 42 at 2K, plus 9.6 Gems for every input image, and in our tests on Mage it returned images in 10 to 20 seconds. The rest sit between 45 and 60 Gems.

The Seedream Models, One by One

1. Seedream 5.5 - by ByteDance

Seedream 5.5 is the newest Seedream, and ByteDance's evaluations put it ahead of 5.0 Pro across the board.

What it does well:

• The most realistic skin, light and materials in the family

• Dense small text, with severe errors in 0.4% of ByteDance's test images

• Edits that keep everything else steady over many rounds

• Characters, References and coordinates for pinpoint edits, at 24 Gems at 1K or 42 at 2K

The catch: it stops at 2K on Mage, it has no Prompt Optimizer setting, and each input image adds 9.6 Gems.

Best for: photoreal portraits and products, posters and infographics with small print, and images you'll keep editing.

2. Seedream 5.0 Pro - by ByteDance

Seedream 5.0 Pro is the 5.0 flagship, and it's the model Mage's Sidekick agent and the Mage API use for Seedream by default.

What it does well:

• The closest prompt following of the 5.0 models, including long, inventory-style prompts

• Readable text in 16 languages for posters, menus, packaging and thumbnails

• Edits that combine up to 10 images, with saved Characters and References

• A Prompt Optimizer with Standard, Fast and Off modes for text-only prompts

The catch: it tops out at 2K on Mage, and it's the slowest and priciest Seedream model when you pay with Gems.

Best for: final images, ads and thumbnails with words in them, and edits that bring several photos together.

3. Seedream 5.0 Flash - by ByteDance

Seedream 5.0 Flash keeps the 5.0 text rendering and edit skills at a fraction of the price and wait.

What it does well:

• 27 Gems an image at 1K or 2K, with no extra charge for input images

• The same multilingual text rendering as 5.0 Pro

• Characters and References for consistent sets

The catch: in crowded scenes it keeps fewer small details than 5.0 Pro, and like Pro it stops at 2K.

Best for: drafts, A/B variations, social batches and any job where you'll pick one image out of twenty.

4. Seedream 5.0 Lite - by ByteDance

Seedream 5.0 Lite was the first 5.0 model, and it renders larger than Pro and Flash.

What it does well:

• 2K and 3K output at 55 Gems

• Characters and References

• Strong single-subject portraits and product shots

The catch: it doesn't render 1K, so it isn't the cheapest way to draft, and its text rendering trails Pro and Flash.

Best for: sharp stills at 3K when 4K is more than you need.

5. Seedream 4.5 - by ByteDance

Seedream 4.5 is the Seedream model to reach for when the image has to be big, and it's the default Seedream model in Mage's generator.

What it does well:

• 2K, 3K and 4K output at 60 Gems

• Moodboards on Mage, which carry a look across a whole set from a board of images

• Better small text than Seedream 4.0

• Characters and References

The catch: it doesn't render 1K, and the 5.0 models follow complex prompts more closely.

Best for: prints, wallpapers, covers, large banners and style-led sets built from a Moodboard.

6. Seedream 4.0 - by ByteDance

Seedream 4.0 is the older all-rounder, and it still covers the widest range of sizes.

What it does well:

• Every size from 1K to 4K at 45 Gems

• Edits and up to 10 input images

The catch: on Mage it doesn't take saved Characters or References, and it drops more details from crowded prompts than the newer models.

Best for: simple images at 4K on a budget, and recreating a look you first made with 4.0.

Which Seedream Model Should You Use?

Pick by the job, not the version number.

For photoreal portraits, posters, menus and packaging with small words, use Seedream 5.5, and draft the layout on 5.0 Flash first. For product photos and ad sets, run 5.5 at 2K for the hero image and 5.0 Flash for the variations. Keep 5.0 Pro for matching work you started on it, or when you want its Fast or Off Prompt Optimizer.

For prints, wallpapers and large covers, use Seedream 4.5 at 4K. When a whole set has to share one look, build a Moodboard and run it on Seedream 4.5.

For a recurring character, save the face once as a Character and use Seedream 5.5, 5.0 Pro or 4.5, so the person stays the same from image to image. For high volume on a budget, Seedream 5.0 Flash costs the least per image, and on a Mage Pro plan none of them use Gems at up to 2K.

How to Try Every Seedream Model on Mage

Step 1: Open the Seedream generator on Mage. You can start free: new members get 300 Gems once.

Step 2: Choose a model in the Model menu: Seedream 5.5, 5.0 Pro, 5.0 Flash, 5.0 Lite, 4.5 or 4.0.

Step 3: Pick an aspect ratio and a resolution. The menu shows only the resolutions the model you picked supports.

Step 4: Write your prompt as plain sentences, and add up to 10 images or an @character if you want to edit or keep a face. The Seedream prompting guide has examples for each kind of image.

Step 5: Generate. Your images are private by default and carry no watermark, and you can use them commercially on every Mage plan.

Seedream on Mage runs with a strict content filter: Mage checks your prompt and your first image before the image is made. If a run is refused, you get your Gems back and a notice that suggests other models to try.

Seedream Model Questions, Answered

What is the newest Seedream model?

Seedream 5.5, released by ByteDance in November 2026. ByteDance says a Pro version of the 5.5 series will follow.

Is Seedream 5.5 better than Seedream 5.0 Pro?

ByteDance's tests say yes: higher quality and usability scores in all six production use cases it measured, more realistic images and fewer text errors. It also costs less on Mage, 24 Gems at 1K or 42 at 2K against 68 or 135. Seedream 5.0 Pro keeps its Fast and Off Prompt Optimizer modes.

Is Seedream 5.0 better than Seedream 4.5?

For text, prompt following and multi-image edits, yes. Seedream 4.5 is still the better choice when you need 4K output or want to use a Moodboard on Mage.

Can Seedream make 4K images?

Yes. On Mage, Seedream 4.5 and Seedream 4.0 render at 4K. Seedream 5.0 Lite goes up to 3K, and 5.5, 5.0 Pro and 5.0 Flash up to 2K.

Is Seedream free to use?

New Mage members get 300 Gems once, enough for about 12 images on Seedream 5.5 at 1K, 11 on Seedream 5.0 Flash or 4 on Seedream 5.0 Pro at 1K. After that, Seedream is unlimited on the Pro plan ($30 a month) at up to 2K, and on Pro Plus ($60 a month) at 3K and 4K.

Does Seedream have a negative prompt?

No. Write what you don't want into the prompt itself, such as "no text other than the title" or "plain white background, no props".

How many images can Seedream use at once?

Up to 10 input images per run on Mage, counting uploads, saved Characters and References.

Can I use Seedream images commercially?

On Mage, yes, on every plan including Free. Seedream is run by ByteDance, so ByteDance's terms apply to the output alongside Mage's.

Why was my Seedream image refused?

Seedream on Mage runs with a strict content filter that checks the prompt and the first image before generation. A refused run is refunded, and the notice suggests other Mage models that can take the request.

Start With the Right Seedream

Most people get the best results by drafting on Seedream 5.0 Flash, finishing on Seedream 5.5, and switching to Seedream 4.5 when the final has to be 4K.

Try all six on the Seedream model page. Have fun creating!