Pick Seedream 4.0 if you generate images at volume and cost is king; pick Nano Banana 2 if you need the best text rendering, blind-arena realism, and a free consumer app. They're both fast — the split comes down to price versus polish.
Quick verdict
Both models launched in the same wave and both target the "fast, good, cheap" corner of image generation. Seedream 4.0 wins the price war by 4–7x and matches on raw speed. Nano Banana 2 wins on the things people actually notice in output — legible text, arena-topping realism — and it's free for casual use inside the Gemini app.
Side by side
| Seedream 4.0 | Nano Banana 2 | |
|---|---|---|
| Maker | ByteDance | Google (Gemini 3.1 Flash Image) |
| Best at | Cheap, high-volume batches | Text, realism, editing |
| Speed (2K) | ~1.8 sec | ~3–5 sec |
| Max resolution | Up to 4K | Up to 4K |
| Text rendering | Solid | Best-in-class |
| Consistency | 9 images, 6 refs | Up to 14 reference images |
| Free tier | Trial credits only | Yes (Gemini app) |
| API price | ~$0.03 / image | $0.045–$0.151 (Pro $0.134) |
Seedream 4.0
Seedream is the value engine. It renders a 2K image in about 1.8 seconds, outputs up to 4K, and holds a subject steady across up to nine images in one request with six reference inputs. Best of all, it's roughly $0.03 per image — cheaper still through third-party endpoints. That combination makes it ideal for ad variants, catalogs, and app-generated imagery.
The trade-offs: it's primarily an API product with no polished Western consumer app, its headline benchmark win is vendor-run, and its text rendering — while good — isn't the reason you'd choose it. Full details in our Seedream 4.0 review and Seedream pricing guide.
Nano Banana 2
Nano Banana 2 (Gemini 3.1 Flash Image) is the all-rounder that sits at the top of the blind image arena. It's the one to beat for photorealistic skin, believable lighting, and legible text in 10+ languages, and it accepts up to 14 reference images for character and product consistency. For most people the killer feature is that it's free in the Gemini app and Google Search.
It costs more on the API — $0.045 to $0.151 depending on resolution, with the heavier Pro model at $0.134 per 2K image — but you're paying for quality that shows. See the full Nano Banana 2 review.
Price & access
This is the clearest gap. Seedream is API-only pay-per-image at about $0.03; Nano Banana 2 is free for casual use and pay-per-image for developers, but at a 4–7x higher rate for comparable Pro-quality output. If you're calling thousands of images a month, Seedream's cost advantage compounds fast. If you generate a handful a day, Nano Banana 2's free tier makes the price question moot.
Which should you pick?
Pick Seedream 4.0 if you're a developer or team generating images at scale, you care about cost-per-image and throughput, and you need batch consistency for storyboards, catalogs, or variants.
Pick Nano Banana 2 if you want the best text rendering and realism, prefer a free app over an API, or need the strongest character consistency across a series. For designers chasing a signature style, neither is the answer — that's Midjourney. Compare the wider field in our best AI image generators roundup.
Frequently Asked Questions
Is Seedream better than Nano Banana 2?
Seedream is cheaper and just as fast, and it's excellent for high-volume batch work. Nano Banana 2 is better for text rendering, blind-arena realism, and casual use thanks to its free Gemini app. The right pick depends on whether cost or output polish matters more.
Which is cheaper?
Seedream, by a wide margin — about $0.03 per image versus Nano Banana Pro's $0.134 per 2K image. That said, Nano Banana 2 Flash is free in the Gemini app with daily caps, which can make it effectively cheaper for light use.
Which renders text better?
Nano Banana 2. It's explicitly built for legible, multi-language text and tops independent tests for typography. Seedream is solid but not class-leading here.
Which is faster?
Seedream is marginally faster on paper — about 1.8 seconds for a 2K image versus roughly 3–5 seconds for Nano Banana 2. Both are fast enough to iterate live.
Which has better consistency?
It's close. Seedream generates up to nine consistent images per request with six reference inputs; Nano Banana 2 accepts up to 14 reference images and holds characters well across a series. For batch sets Seedream is more economical; for tight identity control Nano Banana 2 has more reference headroom.
Can I use both?
Yes, and many teams do — Seedream for bulk generation and drafts, Nano Banana 2 for hero images and anything with embedded text. Both expose APIs, so mixing them in one pipeline is straightforward.