These two sit at the same credit cost, which removes the usual tie-breaker and leaves one decisive difference: only one of them can take your photo as an input.
They cost the same, so pick on capability. Nano Banana takes up to four reference images and edits an existing photo while holding the subject's identity. Seedream 5.0 is text to image only here, and the warmer, more natural photorealism it gives back is the reason to use it anyway.
Most model comparisons are decided by price. This one cannot be, because Google's Nano Banana 2.1 and ByteDance's Seedream 5.0 are priced identically on this platform, down to the credit. That is unusual and it is useful, because it strips the question back to what the models actually do differently.
The answer is unusually clean. Nano Banana accepts reference images and can edit a photo you upload. Seedream, as we serve it, cannot: it is text to image only, with no reference image and no image-to-image editing. Everything else on this page is about why you would still reach for Seedream knowing that.
| Nano Banana 2.1 | Seedream 5.0 | |
|---|---|---|
| Made by | ByteDance | |
| Model ID | gemini-nano-banana-2.1 | fal-ai/bytedance/seedream/v5/lite/text-to-image |
| Credits | 5 credits (per image) | 5 credits (per image) |
| Cost on a credit pack | $0.08 to $0.10 per image | $0.08 to $0.10 per image |
| Aspect ratios | 1:1, 3:4, 4:3, 16:9, 9:16 | 1:1, 3:4, 4:3, 16:9, 9:16 |
| Reference images per prompt | Up to 4 | None, text to image only |
| Speed | Fast, a few seconds | Fast |
| Best at | Edits and value | Photoreal people and scenes |
Read more about each model: Nano Banana and Seedream.
If your starting point is a photograph, the comparison is over before it begins. Nano Banana takes up to four reference images at once, which covers blends, style carries and consistent characters, and it edits an uploaded photo while holding the subject's face, pose and proportions steady. That identity preservation is the reason it powers the selfie-based tools on this platform rather than a cheaper or flashier model.
Seedream on this platform is text to image only. No reference image, no image-to-image editing. That is not a quality judgement about the model, it is the shape of the endpoint we route to, and it means any brief that begins with an upload goes to Nano Banana by default.
Because it does not look the same. Seedream's photorealism runs warmer and less clinical than the other photoreal models here: skin, hair, fabric and daylight read convincingly in a way that is noticeably different from Google's house look, and it handles full-body figures and groups in an environment better than most models at this price. For lifestyle and social content, that difference is the entire reason to pick it.
It is also the cheapest second opinion available. When a Nano Banana result is nearly right but the light feels synthetic, re-running the identical prompt on Seedream costs the same as the first attempt did. Two different houses interpreting one prompt at the same price is a genuinely useful thing to have, and it is why both of these sit in the picker rather than one replacing the other.
Seedream also composes vertical and square framing well rather than producing something that reads as a crop, which matters if the output is going straight to a feed.
Neither of these is the model for words inside a picture. Nano Banana misspells and malforms text often enough that it is not a production choice for it, and Seedream's in-image text is unreliable too. If the image contains a headline, neither of these is the answer and Nano Banana Pro is.
Prompt obedience is also looser on both than on GPT Image 2. If your brief specifies counts, exact placement or precise framing, expect to re-roll. Seedream in particular is looser than GPT Image for counts and exact placement, and it has less English-language documentation than the Google and OpenAI models, so its behaviour is genuinely best learned by trying it rather than by reading about it.
Nano Banana also partially ignores very long, heavily conditional prompts. Shorter and more direct works better, which is worth knowing because the instinct when a cheap model disappoints is to add more words to the prompt, and on this model that makes it worse.
Treat them as one exploration budget rather than two options. Because the credit cost is identical, running the same prompt on both is the cheapest way to find out which house look suits the brief, and it costs exactly what generating twice on either one would. The Model Comparison tool does it in a single pass.
Then escalate. Both of these are exploration models: fast, cheap, and good enough that a lot of work finishes here. When a composition is right but the render is not, the prompt that got you there carries straight onto Nano Banana Pro or GPT Image 2, and the Image to Prompt reverse engine means a look you liked from somewhere else can enter the loop the same way.
No. On this platform they cost exactly the same number of credits per image, which is why the comparison comes down to capability rather than price. The exact figure is in the table on this page and is computed from the live pricing registry rather than written by hand.
Not here. Seedream is served as a text-to-image model on this platform, with no reference image and no image-to-image editing. If your brief starts from an uploaded photo, use Nano Banana, which takes up to four reference images and holds the subject's identity through an edit, or Nano Banana Pro if you need more detail.
They are realistic in different directions rather than in different amounts. Seedream's photorealism tends to read warmer and less clinical, and it is strong on people in an environment. Nano Banana is more all-purpose and rarely has an embarrassing weakness in any one category. Since they cost the same, the practical answer is to run your own prompt through both and judge on your own subject.
Both accept every aspect ratio the image models support, including 9:16. Seedream has an edge on composing vertical and square framing so it does not read as a crop. If the post starts from your own photo, that advantage is irrelevant because Seedream cannot take the upload, and Nano Banana is the pick.
Neither. Nano Banana misspells and malforms in-image text often, and Seedream's is unreliable too. Nano Banana Pro is the model for images containing words, and for long text the right move is to generate the picture and composite the type afterwards.
Run one prompt through both models, see every comparison in one place, or browse all 12 models with specs and prices. Pay as you go, no subscription, credit packs never expire.