Nano Banana 2.1 vs 
Seedream 4
Nano Banana 2.1 is the newer model, released after Seedream 4.
Hyperrealistic Portrait
One prompt, one photorealistic portrait. Skin, eyes, light.
Loading the build
Loading the build
Which answer wins?
Price and specs
Not enough votes to call it. On the specs, Nano Banana 2.1 has the edge: newer, bigger context window, major provider backing.
| Spec | Nano Banana 2.1 | Seedream 4 |
|---|---|---|
| Input price | $1.5/M tokens | — |
| Output price | $7.5/M tokens | — |
| Context window | 66K tokens | — |
| Weights | Closed | — |
| Free API (OpenRouter) | No | — |
| Released | Oct 2026 | Nov 2025 |
| At 10M a month | $15.00 | not listed |
Input tokens at list price. No caching, no batch discount.
Where to run it
Nano Banana 2.11 host
Seedream 4
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 6 Oct 2026.
Common questions
What is the difference between Nano Banana 2.1 and Seedream 4?
Nano Banana 2.1 is developed by Google AI while Seedream 4 is developed by ByteDance. You can compare their actual outputs across 17 challenges on Rival to see how they differ in practice.
Which is better, Nano Banana 2.1 or Seedream 4?
It depends on your use case. Nano Banana 2.1 and Seedream 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 17 challenges so you can judge which fits your needs best.
How can I compare Nano Banana 2.1 and Seedream 4 on Rival?
This page shows a side-by-side comparison of Nano Banana 2.1 and Seedream 4 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.
More comparisons
Against the newest arrivals
- Nano Banana 2.1 vs Recraft V4.1 FlashLanded Sep 2026
- Seedream 4 vs GPT Image 2.5 SunburstLanded Sep 2026
- Nano Banana 2.1 vs GPT Image 2.5 FlareLanded Sep 2026
- Seedream 4 vs Nano Banana 2 LiteLanded Jun 2026
- Nano Banana 2.1 vs Riverflow V2.5 FastLanded Jun 2026
- Seedream 4 vs Riverflow V2.5 ProLanded Jun 2026
- Nano Banana 2.1 vs Recraft V4.1Landed May 2026
- Seedream 4 vs Recraft V4.1 ProLanded May 2026
Same lab, same size, long tail
- Nano Banana 2.1 vs Nano Banana 2 LiteSame lab
- Nano Banana 2.1 vs Nano Banana 2Same lab
- Seedream 4 vs Recraft V4.1 FlashSame size
- Seedream 4 vs Riverflow V2.5 FastSame size
- Nano Banana 2.1 vs Recraft V4.1 ProSame size
- Nano Banana 2.1 vs Riverflow V2.5 ProSame size
- Nano Banana 2.1 vs Stable Diffusion XLSame size
- Nano Banana 2.1 vs Seedream 4.5Same size
