GPT Image 2.5 Sunburst vs 
Nano Banana 2.1
Nano Banana 2.1 is cheaper than GPT Image 2.5 Sunburst at $1.5/M vs $5/M input tokens.
Hyperrealistic Portrait
One prompt, one photorealistic portrait. Skin, eyes, light.
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Which answer wins?
Price and specs
| Spec | GPT Image 2.5 Sunburst | Nano Banana 2.1 |
|---|---|---|
| Input price | $5/M tokens | $1.5/M tokens |
| Output price | $30/M tokens | $7.5/M tokens |
| Context window | — | 66K tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Oct 2026 |
| At 10M a month | $50.00 | $15.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
GPT Image 2.5 Sunburst1 host
Nano Banana 2.11 host
Per million tokens. Prices and uptime via OpenRouter, checked 6 Oct 2026.
Common questions
What is the difference between GPT Image 2.5 Sunburst and Nano Banana 2.1?
GPT Image 2.5 Sunburst is developed by OpenAI while Nano Banana 2.1 is developed by Google AI. You can compare their actual outputs across 19 challenges on Rival to see how they differ in practice.
Which is better, GPT Image 2.5 Sunburst or Nano Banana 2.1?
It depends on your use case. GPT Image 2.5 Sunburst and Nano Banana 2.1 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 GPT Image 2.5 Sunburst cost compared to Nano Banana 2.1?
GPT Image 2.5 Sunburst costs $5/M input tokens and Nano Banana 2.1 costs $1.5/M input tokens. Nano Banana 2.1 is $3.50/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 GPT Image 2.5 Sunburst and Nano Banana 2.1 on Rival?
This page shows a side-by-side comparison of GPT Image 2.5 Sunburst and Nano Banana 2.1 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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Same lab, same size, long tail
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- Nano Banana 2.1 vs Nano Banana 2Same lab
- GPT Image 2.5 Sunburst vs Imagen 3 FastSame size
- GPT Image 2.5 Sunburst vs Imagen 4Same size
- GPT Image 2.5 Sunburst vs Imagen 4 FastSame size
- GPT Image 2.5 Sunburst vs Imagen 4 UltraSame size