Nano Banana 2.1 vs 
Riverflow V2.5 Fast
Riverflow V2.5 Fast is cheaper than Nano Banana 2.1 at $0/M vs $1.5/M input tokens.
Hyperrealistic Portrait
One prompt, one photorealistic portrait. Skin, eyes, light.
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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 | Riverflow V2.5 Fast |
|---|---|---|
| Input price | $1.5/M tokens | Free |
| Output price | $7.5/M tokens | Free |
| Context window | 66K tokens | 8K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Oct 2026 | Jun 2026 |
| At 10M a month | $15.00 | $0 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Nano Banana 2.11 host
Riverflow V2.5 Fast1 host
Per million tokens. Prices and uptime via OpenRouter, checked 6 Oct 2026.
Common questions
What is the difference between Nano Banana 2.1 and Riverflow V2.5 Fast?
Nano Banana 2.1 is developed by Google AI while Riverflow V2.5 Fast is developed by Sourceful. Nano Banana 2.1 has a 66K token context window vs Riverflow V2.5 Fast's 8K. You can compare their actual outputs across 19 challenges on Rival to see how they differ in practice.
Which is better, Nano Banana 2.1 or Riverflow V2.5 Fast?
It depends on your use case. Nano Banana 2.1 and Riverflow V2.5 Fast each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 19 challenges so you can judge which fits your needs best.
How much does Nano Banana 2.1 cost compared to Riverflow V2.5 Fast?
Nano Banana 2.1 costs $1.5/M input tokens and Riverflow V2.5 Fast costs $0/M input tokens. Riverflow V2.5 Fast is $1.50/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.
How can I compare Nano Banana 2.1 and Riverflow V2.5 Fast on Rival?
This page shows a side-by-side comparison of Nano Banana 2.1 and Riverflow V2.5 Fast 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
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