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Gemini 3.1 Pro Preview Custom Tools vs Nano Banana Pro (Gemini 3 Pro Image)

Gemini 3.1 Pro Preview Custom Tools and Nano Banana Pro (Gemini 3 Pro Image) cost about the same per output token ($12.00 vs $12.00 per million). Updated October 21, 2026; no benchmark has tested both models yet.

Replace Gemini 3.1 Pro Preview Custom Tools Replace Nano Banana Pro (Gemini 3 Pro Image)
Gemini 3.1 Pro Preview Custom ToolsGoogle
Coding
No data
Overall
No data
Output $/M
$12.00
Nano Banana Pro (Gemini 3 Pro Image)Google
Coding
No data
Overall
No data
Output $/M
$12.00
vs $12.00 vs $12.00 per 1M output tokens. About the same price.

Gemini 3.1 Pro Preview Custom Tools or Nano Banana Pro (Gemini 3 Pro Image): which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick Gemini 3.1 Pro Preview Custom Tools for a larger context window (1.05M against 131K tokens).

Model AGemini 3.1 Pro Preview Custom ToolsGoogleNot benchmarkedNo coding benchmarkNo cost per solved taskModel BNano Banana Pro (Gemini 3 Pro Image)GoogleNot benchmarkedNo coding benchmarkNo cost per solved task

No benchmark has tested both yet. Gemini 3.1 Pro Preview Custom Tools has results on Vending-Bench 2; Nano Banana Pro (Gemini 3 Pro Image) on LMArena Image Edit. Compare them on price and context instead.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Gemini 3.1 Pro Preview Custom Tools not benchmarked, Nano Banana Pro (Gemini 3 Pro Image) not benchmarked.
Widest category
None yet: no category has been tested on both models.
Widest single gap
None yet: no benchmark has tested both models.
Output price
Both cost $12.00 per million output tokens.
Context window
Gemini 3.1 Pro Preview Custom Tools takes 1.05M tokens, Nano Banana Pro (Gemini 3 Pro Image) 131K.

Benchmark by benchmark

Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.

Agentic workDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
Agentic work benchmarks for Gemini 3.1 Pro Preview Custom Tools and Nano Banana Pro (Gemini 3 Pro Image)
BenchmarkGemini 3.1 Pro Preview Custom ToolsNano Banana Pro (Gemini 3 Pro Image)Leader
Vending-Bench 2$3,774Not measuredOnly Gemini 3.1 Pro Preview Custom Tools measured
Neither model has a result on the other 38 boards here
Image generationDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
Image generation benchmarks for Gemini 3.1 Pro Preview Custom Tools and Nano Banana Pro (Gemini 3 Pro Image)
BenchmarkGemini 3.1 Pro Preview Custom ToolsNano Banana Pro (Gemini 3 Pro Image)Leader
LMArena Image EditNot measured1390Only Nano Banana Pro (Gemini 3 Pro Image) measured
Neither model has a result on the other 4 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Gemini 3.1 Pro Preview Custom Tools$0.0080Fits in one request
Nano Banana Pro (Gemini 3 Pro Image)$0.0080Fits in one request

Same cost

Repository review

50K input + 3K output tokens

Gemini 3.1 Pro Preview Custom Tools$0.136Fits in one request
Nano Banana Pro (Gemini 3 Pro Image)$0.136Fits in one request

Same cost

Agent loop

200K input + 10K output tokens

Gemini 3.1 Pro Preview Custom Tools$0.520Fits in one request
Nano Banana Pro (Gemini 3 Pro Image)$0.520Exceeds the context window

Same cost

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Gemini 3.1 Pro Preview Custom Tools and Nano Banana Pro (Gemini 3 Pro Image)
SpecificationGoogle Gemini 3.1 Pro Preview Custom ToolsGoogle Nano Banana Pro (Gemini 3 Pro Image)
MakerGoogleGoogle
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 25, 2026June 18, 2026
Context window1.05M131K
Input $/Mtok$2.00$2.00
Output $/Mtok$12.00$12.00
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.1 Pro Preview Custom Tools better than Nano Banana Pro (Gemini 3 Pro Image) for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Gemini 3.1 Pro Preview Custom Tools for a larger context window (1.05M against 131K tokens).

Which is cheaper, Gemini 3.1 Pro Preview Custom Tools or Nano Banana Pro (Gemini 3 Pro Image)?

Gemini 3.1 Pro Preview Custom Tools costs $2.00 per million input tokens and $12.00 per million output tokens; Nano Banana Pro (Gemini 3 Pro Image) costs $2.00 and $12.00. Cost per solved task is known for neither of them.

Which has the bigger context window, Gemini 3.1 Pro Preview Custom Tools or Nano Banana Pro (Gemini 3 Pro Image)?

Gemini 3.1 Pro Preview Custom Tools, with 1.05M tokens against 131K.

Has any benchmark tested both Gemini 3.1 Pro Preview Custom Tools and Nano Banana Pro (Gemini 3 Pro Image)?

No benchmark has tested both yet. Gemini 3.1 Pro Preview Custom Tools has results on Vending-Bench 2; Nano Banana Pro (Gemini 3 Pro Image) on LMArena Image Edit. Compare them on price and context instead. Data as of October 21, 2026.

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