Nano Banana 2 (Gemini 3.1 Flash Image) vs Nano Banana Pro (Gemini 3 Pro Image Preview)
Nano Banana 2 (Gemini 3.1 Flash Image) costs 4.0x less per output token than Nano Banana Pro (Gemini 3 Pro Image Preview) ($3.00 vs $12.00 per million). Updated October 21, 2026; 1 benchmarks have a result for both.
Nano Banana 2 (Gemini 3.1 Flash Image) or Nano Banana Pro (Gemini 3 Pro Image Preview): which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick Nano Banana 2 (Gemini 3.1 Flash Image) for output tokens 4.0x cheaper ($3.00 vs $12.00 per million) and a larger context window (131K against 66K tokens).
- Shared results
- 1
- Nano Banana 2 (Gemini 3.1 Flash Image) only
- 0
- Nano Banana Pro (Gemini 3 Pro Image Preview) only
- 4
- Like-for-like categories
- 1 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
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.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Neither has a coding score yet.
One side not measured
Image generation
Design Arena: images
No call
Only Nano Banana Pro (Gemini 3 Pro Image Preview) has a Design Arena: images result, 1216.
Directional only
Long documents
Listed context window
Nano Banana 2 (Gemini 3.1 Flash Image)
Nano Banana 2 (Gemini 3.1 Flash Image) takes 131K tokens against 66K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Nano Banana 2 (Gemini 3.1 Flash Image)
Nano Banana 2 (Gemini 3.1 Flash Image) $0.0020, Nano Banana Pro (Gemini 3 Pro Image Preview) $0.0080 per turn.
List prices
At a glance
- Coding index
- Nano Banana 2 (Gemini 3.1 Flash Image) not benchmarked, Nano Banana Pro (Gemini 3 Pro Image Preview) not benchmarked.
- Widest category
- Image generation, 0.3 points apart on average over 1 shared benchmark.
- Widest single gap
- LMArena Image Edit: Nano Banana 2 (Gemini 3.1 Flash Image) 1387 against Nano Banana Pro (Gemini 3 Pro Image Preview) 1385, 0.3 points apart on a 0 to 100 scale.
- Output price
- Nano Banana 2 (Gemini 3.1 Flash Image) $3.00 against Nano Banana Pro (Gemini 3 Pro Image Preview) $12.00 per million output tokens, 4.0x apart.
- Context window
- Nano Banana 2 (Gemini 3.1 Flash Image) takes 131K tokens, Nano Banana Pro (Gemini 3 Pro Image Preview) 66K.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | Nano Banana 2 (Gemini 3.1 Flash Image) | Bars | Nano Banana Pro (Gemini 3 Pro Image Preview) | Ties |
|---|---|---|---|---|
| Image generation | 1 | 0 | ||
| All shared boards | 1 | 0 |
CodingNot comparableSix of these boards feed the Vibe Coding Index0 boards, none shared
| Benchmark | Nano Banana 2 (Gemini 3.1 Flash Image) | Nano Banana Pro (Gemini 3 Pro Image Preview) | Leader |
|---|---|---|---|
| Neither model has a result on 38 boards here | |||
IntelligenceNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Nano Banana 2 (Gemini 3.1 Flash Image) | Nano Banana Pro (Gemini 3 Pro Image Preview) | Leader |
|---|---|---|---|
| Neither model has a result on 2 boards here | |||
Agentic workNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Nano Banana 2 (Gemini 3.1 Flash Image) | Nano Banana Pro (Gemini 3 Pro Image Preview) | Leader |
|---|---|---|---|
| Neither model has a result on 39 boards here | |||
ReasoningNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Nano Banana 2 (Gemini 3.1 Flash Image) | Nano Banana Pro (Gemini 3 Pro Image Preview) | Leader |
|---|---|---|---|
| Neither model has a result on 21 boards here | |||
MathNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Nano Banana 2 (Gemini 3.1 Flash Image) | Nano Banana Pro (Gemini 3 Pro Image Preview) | Leader |
|---|---|---|---|
| Neither model has a result on 13 boards here | |||
KnowledgeNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Nano Banana 2 (Gemini 3.1 Flash Image) | Nano Banana Pro (Gemini 3 Pro Image Preview) | Leader |
|---|---|---|---|
| Neither model has a result on 17 boards here | |||
Web designNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Nano Banana 2 (Gemini 3.1 Flash Image) | Nano Banana Pro (Gemini 3 Pro Image Preview) | Leader |
|---|---|---|---|
| Neither model has a result on 9 boards here | |||
GeneralNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Nano Banana 2 (Gemini 3.1 Flash Image) | Nano Banana Pro (Gemini 3 Pro Image Preview) | Leader |
|---|---|---|---|
| Neither model has a result on 46 boards here | |||
Image generationLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Nano Banana 2 (Gemini 3.1 Flash Image) | Nano Banana Pro (Gemini 3 Pro Image Preview) | Leader |
|---|---|---|---|
| Design Arena: images | Not measured | 1216 | Only Nano Banana Pro (Gemini 3 Pro Image Preview) measured |
| Design Arena: graphic design | Not measured | 1226 | Only Nano Banana Pro (Gemini 3 Pro Image Preview) measured |
| Design Arena: logos | Not measured | 1181 | Only Nano Banana Pro (Gemini 3 Pro Image Preview) measured |
| LMArena Text to Image | Not measured | 1234 | Only Nano Banana Pro (Gemini 3 Pro Image Preview) measured |
| LMArena Image Edit | 1387 | 1385 | Nano Banana 2 (Gemini 3.1 Flash Image) |
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 (Gemini 3.1 Flash Image) costs less
Repository review
50K input + 3K output tokens
Nano Banana 2 (Gemini 3.1 Flash Image) costs less
Agent loop
200K input + 10K output tokens
Nano Banana 2 (Gemini 3.1 Flash 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.
| Specification | Google Nano Banana 2 (Gemini 3.1 Flash Image) | Google Nano Banana Pro (Gemini 3 Pro Image Preview) |
|---|---|---|
| Maker | ||
| Weights | No public weights listed | No public weights listed |
| Released | June 18, 2026 | November 20, 2025 |
| Context window | 131K | 66K |
| Input $/Mtok | $0.50 | $2.00 |
| Output $/Mtok | $3.00 | $12.00 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 0 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Nano Banana 2 (Gemini 3.1 Flash Image) better than Nano Banana Pro (Gemini 3 Pro Image Preview) for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Nano Banana 2 (Gemini 3.1 Flash Image) for output tokens 4.0x cheaper ($3.00 vs $12.00 per million) and a larger context window (131K against 66K tokens).
Which is cheaper, Nano Banana 2 (Gemini 3.1 Flash Image) or Nano Banana Pro (Gemini 3 Pro Image Preview)?
Nano Banana 2 (Gemini 3.1 Flash Image) costs $0.50 per million input tokens and $3.00 per million output tokens; Nano Banana Pro (Gemini 3 Pro Image Preview) 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 (Gemini 3.1 Flash Image) or Nano Banana Pro (Gemini 3 Pro Image Preview)?
Nano Banana 2 (Gemini 3.1 Flash Image), with 131K tokens against 66K.
How many benchmarks is the Nano Banana 2 (Gemini 3.1 Flash Image) vs Nano Banana Pro (Gemini 3 Pro Image Preview) comparison based on?
1 benchmarks have a result for both models as of October 21, 2026. Nano Banana 2 (Gemini 3.1 Flash Image)'s coding index rests on 0 independent benchmarks and Nano Banana Pro (Gemini 3 Pro Image Preview)'s on 0. Where only one model has a result, the page says so instead of naming a winner.