GPT Image 1.5 (Low) vs 
Nano Banana 2.1
Nano Banana 2.1 is the newer model, released after GPT Image 1.5 (Low).
Hyperrealistic Portrait
One prompt, one photorealistic portrait. Skin, eyes, light.
Loading the build
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Which answer wins?
Price and specs
| Spec | GPT Image 1.5 (Low) | Nano Banana 2.1 |
|---|---|---|
| Input price | — | $1.5/M tokens |
| Output price | — | $7.5/M tokens |
| Context window | — | 66K tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | — | No |
| Released | Dec 2025 | Oct 2026 |
| At 10M a month | not listed | $15.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
GPT Image 1.5 (Low)
No hosts listed on OpenRouter.
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 1.5 (Low) and Nano Banana 2.1?
GPT Image 1.5 (Low) is developed by OpenAI while Nano Banana 2.1 is developed by Google AI. You can compare their actual outputs across 17 challenges on Rival to see how they differ in practice.
Which is better, GPT Image 1.5 (Low) or Nano Banana 2.1?
It depends on your use case. GPT Image 1.5 (Low) and Nano Banana 2.1 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 GPT Image 1.5 (Low) and Nano Banana 2.1 on Rival?
This page shows a side-by-side comparison of GPT Image 1.5 (Low) 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
Against the newest arrivals
- GPT Image 1.5 (Low) vs Recraft V4.1 FlashLanded Sep 2026
- Nano Banana 2.1 vs GPT Image 2.5 SunburstLanded Sep 2026
- GPT Image 1.5 (Low) vs GPT Image 2.5 FlareLanded Sep 2026
- Nano Banana 2.1 vs Nano Banana 2 LiteLanded Jun 2026
- GPT Image 1.5 (Low) vs Riverflow V2.5 FastLanded Jun 2026
- Nano Banana 2.1 vs Riverflow V2.5 ProLanded Jun 2026
- GPT Image 1.5 (Low) vs Recraft V4.1Landed May 2026
- Nano Banana 2.1 vs Recraft V4.1 ProLanded May 2026
Same lab, same size, long tail
- GPT Image 1.5 (Low) vs GPT Image 2.5 SunburstSame lab
- GPT Image 1.5 (Low) vs GPT Image 2Same lab
- Nano Banana 2.1 vs Nano Banana 2Same lab
- Nano Banana 2.1 vs Imagen 4Same lab
- GPT Image 1.5 (Low) vs Luma PhotonSame size
- GPT Image 1.5 (Low) vs Luma Photon FlashSame size
- Nano Banana 2.1 vs Playground v2.5 (Aesthetic)Same size
- Nano Banana 2.1 vs Qwen ImageSame size
