Gemini 3.1 Flash Image Preview, a.k.a. "Nano Banana 2," is Google’s latest state of the art image generation and editing model, delivering Pro-level visual quality at Flash speed. It combines advanced contextual understanding with fast, cos…
Model details →Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) vs OpenAI: GPT-5 Image
Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) and OpenAI: GPT-5 Image are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
[GPT-5](https://openrouter.ai/openai/gpt-5) Image combines OpenAI's GPT-5 model with state-of-the-art image generation capabilities. It offers major improvements in reasoning, code quality, and user experience while incorporating GPT Image …
Model details →Side-by-side comparison
| Capability | Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) | OpenAI: GPT-5 Image | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 66K | 400K | 🏆 OpenAI: GPT-5 Image |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.50 | $10.00 | 🏆 Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $3.00 | $10.00 | 🏆 Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) |
| Tool / function calling First-class support for emitting structured tool calls. | — | Yes | 🏆 OpenAI: GPT-5 Image |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) better than OpenAI: GPT-5 Image?
Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) and OpenAI: GPT-5 Image are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) and OpenAI: GPT-5 Image?
Input: $0.50 vs $10.00 per 1M tokens. Output: $3.00 vs $10.00 per 1M tokens.
What context windows do Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) and OpenAI: GPT-5 Image support?
Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) supports up to 66K tokens. OpenAI: GPT-5 Image supports up to 400K tokens.
Do both Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview) and OpenAI: GPT-5 Image support tool calling?
Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview): not advertised. OpenAI: GPT-5 Image: yes.