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Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) vs Gemini 3.1 Pro Preview Custom Tools

Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) costs 8.0x less per output token than Gemini 3.1 Pro Preview Custom Tools ($1.50 vs $12.00 per million). Updated October 22, 2026; no benchmark has tested both models yet.

Replace Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) Replace Gemini 3.1 Pro Preview Custom Tools
Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)Google
Coding
No data
Overall
No data
Output $/M
$1.50
Gemini 3.1 Pro Preview Custom ToolsGoogle
Coding
No data
Overall
No data
Output $/M
$12.00
vs $1.50 vs $12.00 per 1M output tokens. Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) is 8.0x cheaper.

Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) or Gemini 3.1 Pro Preview Custom Tools: which to pick

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

Pick Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) for output tokens 8.0x cheaper ($1.50 vs $12.00 per million).

Model ANano Banana 2 Lite (Gemini 3.1 Flash Lite Image)GoogleNot benchmarkedNo coding benchmarkNo cost per solved taskModel BGemini 3.1 Pro Preview Custom ToolsGoogleNot benchmarkedNo coding benchmarkNo cost per solved task

No benchmark has tested both yet. Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) has results on Design Arena: images, Design Arena: graphic design and Design Arena: logos; Gemini 3.1 Pro Preview Custom Tools on Vending-Bench 2. 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
Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) not benchmarked, Gemini 3.1 Pro Preview Custom Tools 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
Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) $1.50 against Gemini 3.1 Pro Preview Custom Tools $12.00 per million output tokens, 8.0x apart.
Context window
Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) takes 66K tokens, Gemini 3.1 Pro Preview Custom Tools 1.05M.

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 Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) and Gemini 3.1 Pro Preview Custom Tools
BenchmarkNano Banana 2 Lite (Gemini 3.1 Flash Lite Image)Gemini 3.1 Pro Preview Custom ToolsLeader
Vending-Bench 2Not measured$3,774Only Gemini 3.1 Pro Preview Custom Tools measured
Neither model has a result on the other 40 boards here
Image generationDirectional onlyPublic boards, shown as published, kept out of the index5 boards measured
Image generation benchmarks for Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) and Gemini 3.1 Pro Preview Custom Tools
BenchmarkNano Banana 2 Lite (Gemini 3.1 Flash Lite Image)Gemini 3.1 Pro Preview Custom ToolsLeader
Design Arena: images1239Not measuredOnly Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) measured
Design Arena: graphic design1249Not measuredOnly Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) measured
Design Arena: logos1214Not measuredOnly Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) measured
LMArena Text to Image1250Not measuredOnly Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) measured
LMArena Image Edit1313Not measuredOnly Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) measured

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

Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)$0.0010Fits in one request
Gemini 3.1 Pro Preview Custom Tools$0.0080Fits in one request

Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) costs less

Repository review

50K input + 3K output tokens

Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)$0.017Fits in one request
Gemini 3.1 Pro Preview Custom Tools$0.136Fits in one request

Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) costs less

Agent loop

200K input + 10K output tokens

Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)$0.065Exceeds the context window
Gemini 3.1 Pro Preview Custom Tools$0.520Fits in one request

Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) costs less

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 Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) and Gemini 3.1 Pro Preview Custom Tools
SpecificationGoogle Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)Google Gemini 3.1 Pro Preview Custom Tools
MakerGoogleGoogle
WeightsNo public weights listedNo public weights listed
ReleasedJune 30, 2026February 25, 2026
Context window66K1.05M
Input $/Mtok$0.25$2.00
Output $/Mtok$1.50$12.00
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) better than Gemini 3.1 Pro Preview Custom Tools for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) for output tokens 8.0x cheaper ($1.50 vs $12.00 per million).

Which is cheaper, Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) or Gemini 3.1 Pro Preview Custom Tools?

Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) costs $0.25 per million input tokens and $1.50 per million output tokens; Gemini 3.1 Pro Preview Custom Tools costs $2.00 and $12.00. Cost per solved task is known for neither of them.

Which has the bigger context window, Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) or Gemini 3.1 Pro Preview Custom Tools?

Gemini 3.1 Pro Preview Custom Tools, with 1.05M tokens against 66K.

Has any benchmark tested both Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) and Gemini 3.1 Pro Preview Custom Tools?

No benchmark has tested both yet. Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) has results on Design Arena: images, Design Arena: graphic design and Design Arena: logos; Gemini 3.1 Pro Preview Custom Tools on Vending-Bench 2. Compare them on price and context instead. Data as of October 22, 2026.

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