GoogleReasoningReleased 26 February 2026
Nano Banana 2 (Gemini 3.1 Flash Image Preview) pricing, context and benchmark
Gemini 3.1 Flash Image Preview, a.k.a.
66K
Input context
59K
Output context
$0.5
Official input
$3
Official output
n/a
AA index
01 · Model Overview
Everything that matters, in one table
Context, pricing, cache, modalities and tooling, from the model registry and Artificial Analysis.
| Model | Nano Banana 2 (Gemini 3.1 Flash Image Preview) |
| Model ID | google/gemini-3.1-flash-image-preview |
| Provider | |
| Release date | 26 February 2026 |
| Status | Generally available |
| Input context | 65,536 tokens |
| Output context | 58,982 tokens |
| Official input pricing | $0.5 per 1M tokens |
| Official output pricing | $3 per 1M tokens |
| Cache read pricing | Not published |
| Market input pricing | $0.5 per 1M (cheapest route) |
| Market output pricing | $3 per 1M (cheapest route) |
| Reasoning tokens | Billed as output at $3 per 1M |
| Input modalities | image · text |
| Output modalities | image · text |
| Reasoning control | Yes, effort levels exposed |
| Tool support | Text generation only |
| Tokenizer | Gemini |
| Provider routes | 1 endpoint |
| Artificial Analysis index | Not published |
| Speed | Not published |
| Knowledge cutoff | Not publicly stated |
Input and output support
| Modality | Input | Output | Billed at |
|---|---|---|---|
| Text | ✓ yes | ✓ yes | $0.5 in |
| Image | ✓ yes | ✓ yes | $0.5 in |
| Audio | no | no | not supported |
| Video | no | no | not supported |
| File (PDF) | no | no | not supported |
02 · Overview
What is Nano Banana 2 (Gemini 3.1 Flash Image Preview)?
Gemini 3.1 Flash Image Preview, a.k.a.
"Nano Banana 2," is Google’s latest state of the art image generation and editing model, delivering Pro-level visual quality at Flash speed.
It combines...
Nano Banana 2 (Gemini 3.1 Flash Image Preview) carries a 66K token window, uses the Gemini tokenizer and is served by Google. On Hoodgen it sits in the Reasoning tier of the model menu next to its siblings, so you can switch mid conversation without losing the thread.
03 · Release
Release and what changed from the previous version
Released26 February 2026
| Property | Gemini 3.1 Pro Preview Custom Tools | Nano Banana 2 (Gemini 3.1 Flash Image Preview) | Change |
|---|---|---|---|
| Released | 2026 | 2026 | Same release window |
| Context | 1.05M | 66K | Changed |
| Max output | 66K | 59K | Changed |
| Input price | $2 | $0.5 | Cheaper |
| Output price | $12 | $3 | Cheaper |
| Input modalities | text, audio, image, video, file | image, text | Unchanged |
| AA index | n/a | n/a | Newer benchmark run |
04 · Capabilities
Features and capabilities
◈
Thinking control
Reasoning effort can be dialled per request, so one model covers deep analysis and fast chat.
{ }
Structured outputs
Schema constrained JSON with response_format, so no parse and retry loop in your code.
◉
Vision
Screenshots, charts and photographed documents are read at the text token rate.
⌁
Seeds
A seed can be pinned so the same prompt is reproducible across test runs.
05 · Reasoning
Thinking and reasoning capabilities
Nano Banana 2 (Gemini 3.1 Flash Image Preview) can think before answering and exposes the effort level per request. Reasoning tokens bill as output at $3 per million, and the trace can be returned with include_reasoning.
| Level | First token | Cost per task | Best for |
|---|---|---|---|
| Measured | n/a | n/a | Artificial Analysis measures the default reasoning configuration |
| Low effort | Faster | Lower | Chat, autocomplete, classification |
| High effort | Slower | Higher | Debugging, planning, multi step agents |
07 · Use cases
What can you do with Nano Banana 2 (Gemini 3.1 Flash Image Preview)?
Debugging and root cause
Multi file failures where the model has to hold a causal chain before answering.
Architecture and planning
Design docs, migration plans and trade off analysis over long context.
Data analysis
Spreadsheets and logs read in one pass, then summarised with the numbers quoted back.
Agentic coding
Repo wide changes that need plan, edit and verify loops.
09 · Pricing
Nano Banana 2 (Gemini 3.1 Flash Image Preview) pricing
Official pricing
List price
$0.5 / 1M in
$3 / 1M out
- 66K context
- image, text input
Cheapest route
$0.5 / 1M in
$3 / 1M out
- 1 route on OpenRouter
- What Hoodgen routes to first
- Same model, lower bill
Market pricing, every route
| Provider | Tier | Input | Output | Cache read | Uptime 24h |
|---|---|---|---|---|---|
| Google AI Studio | standard | $0.5 | $3 | n/a | 100.0% |
API pricing and cost calculator
| Rate | Per call | Total | Credits |
|---|---|---|---|
| Cheapest route | $0.0145 | $7.25 | 6888 |
| List price | $0.0145 | $7.25 | 6888 |
10 · Developers
API and developer information
| Model ID | google/gemini-3.1-flash-image-preview |
| Endpoint | https://openrouter.ai/api/v1/chat/completions |
| Parameters | include_reasoning · max_tokens · reasoning · reasoning_effort · response_format · seed · structured_outputs · temperature · top_p |
| Streaming | Yes, server sent events |
| Modality string | text+image->text+image |
| Max prompt tokens | 65,536 |
| Max completion tokens | 58,982 |
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "google/gemini-3.1-flash-image-preview",
"messages": [{ "role": "user", "content": "Summarise this document." }],
"max_tokens": 1024
}'11 · Limitations
Model limitations
| Output cap | 58,982 tokens per request. Long deliverables have to be chunked. |
| Benchmarks not published | Artificial Analysis does not publish an Intelligence Index for this release, so no benchmark score is claimed here. |
| Knowledge cutoff | The provider does not state a fixed cutoff for every release. Verify very recent events against search. |
12 · Comparison
Nano Banana 2 (Gemini 3.1 Flash Image Preview) vs other Google models
| Model | Context | Input /1M | Output /1M | AA index | Released |
|---|---|---|---|---|---|
| Nano Banana 2 (Gemini 3.1 Flash Image Preview) | 66K | $0.5 | $3 | n/a | 2026 |
| Gemini 3.1 Pro Preview | 1.05M | $2 | $12 | n/a | 2026 |
| Gemini 4 Argon | 1.05M | $2 | $10 | 50 | Oct 2026 |
| Gemini 4 Carbon | 1.05M | $2 | $10 | n/a | 2026 |
| Gemini 3.1 Pro Preview Custom Tools | 1.05M | $2 | $12 | n/a | 2026 |
| Nano Banana Pro (Gemini 3 Pro Image) | 131K | $2 | $12 | n/a | 2026 |
13 · Privacy
Privacy and data policy
- On Hoodgen, prompts and attachments answer that request and stay in your conversation history so you can reopen it. They are not used to train models.
- Requests route through OpenRouter to Google and are covered by that provider's API terms.
- Do not paste secrets or personal data you would not send to any hosted model.
14 · FAQ
Nano Banana 2 (Gemini 3.1 Flash Image Preview) questions, answered
Nano Banana 2 (Gemini 3.1 Flash Image Preview) is a reasoning model from Google, released 26 February 2026. Gemini 3.1 Flash Image Preview, a.k.a.
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Start chatting with Nano Banana 2 (Gemini 3.1 Flash Image Preview)
Free to try on Hoodgen AI, with a live credit estimate before every send. No API key, no setup.