Google: Nano Banana Pro (Gemini 3 Pro Image) vs Google: Gemini 3.1 Pro Preview Custom Tools — pricing compared

Side-by-side API pricing for Google: Nano Banana Pro (Gemini 3 Pro Image) and Google: Gemini 3.1 Pro Preview Custom Tools, normalized to $/1M tokens from the live OpenRouter feed.

Token Price Index › Browse › Google: Nano Banana Pro (Gemini 3 Pro Image) vs Google: Gemini 3.1 Pro Preview Custom Tools

On blended cost, Google: Gemini 3.1 Pro Preview Custom Tools ($4.50/M) is about 0% cheaper than Google: Nano Banana Pro (Gemini 3 Pro Image) ($4.50/M) per 1M tokens. Google: Gemini 3.1 Pro Preview Custom Tools wins on input price, Google: Gemini 3.1 Pro Preview Custom Tools on output, and Google: Gemini 3.1 Pro Preview Custom Tools has the larger context window.

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Google: Nano Banana Pro (Gemini 3 Pro Image) pricingGoogle: Gemini 3.1 Pro Preview Custom Tools pricingBrowse all
ModelContextInput $/MOutput $/MBlended $/M
Google: Nano Banana Pro (Gemini 3 Pro Image)visioncache
google
131,072$2.00/M$12.00/M$4.50/M
Google: Gemini 3.1 Pro Preview Custom Toolsvisioncache
google
1,048,576$2.00/M$12.00/M$4.50/M

Frequently asked questions

Is Google: Nano Banana Pro (Gemini 3 Pro Image) or Google: Gemini 3.1 Pro Preview Custom Tools cheaper?
On a blended basis Google: Gemini 3.1 Pro Preview Custom Tools is cheaper at $4.50/M per 1M tokens versus $4.50/M for Google: Nano Banana Pro (Gemini 3 Pro Image) — about 0% less. Blended weights input 3:1 over output.
Google: Nano Banana Pro (Gemini 3 Pro Image) vs Google: Gemini 3.1 Pro Preview Custom Tools: input token cost?
Google: Nano Banana Pro (Gemini 3 Pro Image) charges $2.00/M per 1M input tokens; Google: Gemini 3.1 Pro Preview Custom Tools charges $2.00/M. Google: Gemini 3.1 Pro Preview Custom Tools is cheaper on input.
Google: Nano Banana Pro (Gemini 3 Pro Image) vs Google: Gemini 3.1 Pro Preview Custom Tools: output token cost?
Google: Nano Banana Pro (Gemini 3 Pro Image) charges $12.00/M per 1M output tokens; Google: Gemini 3.1 Pro Preview Custom Tools charges $12.00/M. Google: Gemini 3.1 Pro Preview Custom Tools is cheaper on output.
Which has the larger context window, Google: Nano Banana Pro (Gemini 3 Pro Image) or Google: Gemini 3.1 Pro Preview Custom Tools?
Google: Nano Banana Pro (Gemini 3 Pro Image) supports 131,072 tokens and Google: Gemini 3.1 Pro Preview Custom Tools supports 1,048,576 tokens, so Google: Gemini 3.1 Pro Preview Custom Tools handles longer inputs in a single call.
How do I track Google: Nano Banana Pro (Gemini 3 Pro Image) and Google: Gemini 3.1 Pro Preview Custom Tools price changes?
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Data: OpenRouter public model API, normalized to $/1M tokens. Blended = (3×input + output)/4. Generated 19 Oct 2026 22:00 UTC. Prices change often — confirm on the provider before committing spend.