Nano Banana Pro is Google’s most advanced image-generation and editing model, built on Gemini 3 Pro. It extends the original Nano Banana with significantly improved multimodal reasoning, real-world grounding, and high-fidelity visual synthe…
Model details →Google: Nano Banana Pro (Gemini 3 Pro Image Preview) vs OpenAI: GPT-5.1-Codex
OpenAI: GPT-5.1-Codex wins on 4 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks. The model supp…
Model details →Side-by-side comparison
| Capability | Google: Nano Banana Pro (Gemini 3 Pro Image Preview) | OpenAI: GPT-5.1-Codex | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 66K | 400K | 🏆 OpenAI: GPT-5.1-Codex |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $2.00 | $1.25 | 🏆 OpenAI: GPT-5.1-Codex |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $12.00 | $10.00 | 🏆 OpenAI: GPT-5.1-Codex |
| Tool / function calling First-class support for emitting structured tool calls. | — | Yes | 🏆 OpenAI: GPT-5.1-Codex |
| 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 Pro (Gemini 3 Pro Image Preview) better than OpenAI: GPT-5.1-Codex?
OpenAI: GPT-5.1-Codex wins on 4 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Google: Nano Banana Pro (Gemini 3 Pro Image Preview) and OpenAI: GPT-5.1-Codex?
Input: $2.00 vs $1.25 per 1M tokens. Output: $12.00 vs $10.00 per 1M tokens.
What context windows do Google: Nano Banana Pro (Gemini 3 Pro Image Preview) and OpenAI: GPT-5.1-Codex support?
Google: Nano Banana Pro (Gemini 3 Pro Image Preview) supports up to 66K tokens. OpenAI: GPT-5.1-Codex supports up to 400K tokens.
Do both Google: Nano Banana Pro (Gemini 3 Pro Image Preview) and OpenAI: GPT-5.1-Codex support tool calling?
Google: Nano Banana Pro (Gemini 3 Pro Image Preview): not advertised. OpenAI: GPT-5.1-Codex: yes.