Nano Banana 2 is the newer model, released after Imagen 4 Ultra.
One prompt, one photorealistic portrait. Skin, eyes, light.
Which answer wins?
| Spec | ||
|---|---|---|
| Parameters | Not disclosed | Not disclosed |
| Weights | — | Closed |
| Free API (OpenRouter) | — | No |
| Released | May 2025 | Feb 2026 |
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 12 Oct 2026.
Both are developed by Google AI but target different use cases. You can compare their actual outputs across 18 challenges on Rival to see how they differ in practice.
It depends on your use case. Imagen 4 Ultra and Nano Banana 2 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 18 challenges so you can judge which fits your needs best.
This page shows a side-by-side comparison of Imagen 4 Ultra and Nano Banana 2 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.