// head_to_head
Gemini 3.1 Pro Preview vs Nano Banana Pro (Gemini 3 Pro Image Preview)
Published LiveBench scores across all seven categories, live list pricing, context windows, and the measured cost of a point of capability — for both models, side by side.
Gemini 3.1 Pro Preview and Nano Banana Pro (Gemini 3 Pro Image Preview) are priced within ~10% of each other.
Nano Banana Pro (Gemini 3 Pro Image Preview) does not have a published LiveBench run, so this comparison covers price, context and declared capabilities only. A missing score means "not evaluated", not "worse" — the right way to separate these two is an eval on your own workload.
Gemini 3.1 Pro Preview
- Blended / 1M
- $4.50
- Context
- 1.0M
- Released
- Feb 19, 2026
- Overall score
- 77.0
Nano Banana Pro (Gemini 3 Pro Image Preview)
- Blended / 1M
- $4.50
- Context
- 66K
- Released
- Nov 20, 2025
- Overall score
- Not evaluated
Specs and pricing
| Metric | Gemini 3.1 Pro Preview | Nano Banana Pro (Gemini 3 Pro Image Preview) |
|---|---|---|
| LiveBench overall Mean of the seven LiveBench category scores, 0–100. Higher is better. | 77.0 | — |
| Cost per point Measured benchmark spend divided by overall score — dollars per point of capability. | $0.1567 | — |
| Blended price / 1M 3:1 input:output mix, the usual shape of production traffic. | $4.50 | $4.50 |
| Input price / 1M | $2.00 | $2.00 |
| Output price / 1M | $12.00 | $12.00 |
| Cached input / 1M Price of an input token served from the prompt cache, where the provider publishes one. | $0.200 | $0.200 |
| Context window | 1.0Mwin | 66K |
| Max output tokens | 66Kwin | 33K |
Benchmarks by category
An overall score averages away the thing you probably care about. These are the seven LiveBench categories scored separately — Gemini 3.1 Pro Preview on top, Nano Banana Pro (Gemini 3 Pro Image Preview) below, both out of 100.
What each one costs to run
Per-token prices are hard to feel. These are monthly list costs for both models across five workload shapes, using each provider's published cached-input rate where there is one.
| Workload | Gemini 3.1 Pro Preview | Nano Banana Pro (Gemini 3 Pro Image Preview) |
|---|---|---|
| Support chatbot 1.2K in / 400 out × 200K requests | $1,310/mo | $1,310/mo |
| RAG assistant 8K in / 600 out × 100K requests | $1,600/mo | $1,600/mo |
| Coding agent 40K in / 4K out × 20K requests | $1,552/mo | $1,552/mo |
| Document extraction 20K in / 1.5K out × 50K requests | $2,810/mo | $2,810/mo |
| Bulk classification 500 in / 20 out × 5M requests | $5,300/mo | $5,300/mo |
Which should you pick?
You need to fit large documents in one call
Gemini 3.1 Pro Preview
Wider context window — 1.0M against 66K.
Gemini 3.1 Pro Preview vs Nano Banana Pro (Gemini 3 Pro Image Preview) FAQ
Which is better, Gemini 3.1 Pro Preview or Nano Banana Pro (Gemini 3 Pro Image Preview)?
Gemini 3.1 Pro Preview and Nano Banana Pro (Gemini 3 Pro Image Preview) are priced within ~10% of each other. Nano Banana Pro (Gemini 3 Pro Image Preview) does not have a published LiveBench run, so this comparison covers price, context and declared capabilities only. A missing score means "not evaluated", not "worse" — the right way to separate these two is an eval on your own workload.
Is Gemini 3.1 Pro Preview cheaper than Nano Banana Pro (Gemini 3 Pro Image Preview)?
They cost about the same. Both land near $4.50 per million tokens on a 3:1 input:output blend, so price is unlikely to be the deciding factor between them.
Does Gemini 3.1 Pro Preview or Nano Banana Pro (Gemini 3 Pro Image Preview) have a bigger context window?
Gemini 3.1 Pro Preview has the larger context window: 1.0M for Gemini 3.1 Pro Preview against 66K for Nano Banana Pro (Gemini 3 Pro Image Preview). Note that a window you can fill is not a window you should fill — retrieval quality usually degrades well before the limit, and you pay for every token you put in it.
Do Gemini 3.1 Pro Preview and Nano Banana Pro (Gemini 3 Pro Image Preview) support prompt caching?
Both publish a cached-input rate: $0.200 per million for Gemini 3.1 Pro Preview and $0.200 for Nano Banana Pro (Gemini 3 Pro Image Preview), against full input rates of $2.00 and $2.00. On a workload with a long stable prefix — a system prompt, a tool schema, a retrieved corpus — that changes the economics more than the headline price does.
Related comparisons
How these numbers are produced
- Price — provider list price from OpenRouter, refreshed every 15 minutes. “Blended” is a 3:1 input:output mix.
- Scores — LiveBench release 2026-06-25, using their own category map. Each model shows its strongest published run. A blank means “not evaluated”, never “bad”.
- Cost per point — the measured dollars LiveBench spent on the run, divided by the score it earned.
- “Win” — awarded only past a threshold: one full point on a benchmark score, 10% on a price, 25% on a context window. Anything tighter reports as a tie, because effort settings alone move a LiveBench score by more than that.
Published benchmarks rank models on someone else's tasks. Before committing, see LLM & agent evaluation for building an eval on your own.